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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#nullable disable
using System.Linq;
using Microsoft.CodeAnalysis.CSharp.Symbols;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
using Microsoft.CodeAnalysis.Operations;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;
namespace Microsoft.CodeAnalysis.CSharp.UnitTests
{
public class UnionsTests : CSharpTestBase
{
[Fact]
public void UnionType_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
public interface IUnion
{
#nullable enable
object? Value { get; }
#nullable disable
}
[System.Runtime.CompilerServices.Union]
interface I1;
[System.Runtime.CompilerServices.Union]
struct S1
{
public object Value => null;
}
struct S2 : IUnion
{
public object Value => null;
}
[System.Runtime.CompilerServices.Union]
class C1
{
public object Value => null;
}
[System.Runtime.CompilerServices.Union]
sealed class C2
{
public object Value => null;
}
sealed class C3 : IUnion
{
public object Value => null;
}
sealed class C4 : C1
{
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyEmitDiagnostics();
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
Assert.True(comp.GetTypeByMetadataName("C1").IsUnionType);
Assert.True(comp.GetTypeByMetadataName("C2").IsUnionType);
Assert.False(comp.GetTypeByMetadataName("C4").IsUnionType);
Assert.False(comp.GetTypeByMetadataName("I1").IsUnionType);
Assert.False(comp.GetTypeByMetadataName("S2").IsUnionType);
Assert.False(comp.GetTypeByMetadataName("C3").IsUnionType);
}
[Fact]
public void UnionType_02_UnionNotPublic()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public object Value => null;
}
namespace System.Runtime.CompilerServices
{
public class UnionAttribute : System.Attribute
{
}
}
";
var comp = CreateCompilation(src);
comp.VerifyEmitDiagnostics();
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
}
[Fact]
public void UnionType_03_ManyUnionAttributeTypes()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
public struct S1
{
public object Value => null;
}
";
var comp1 = CreateCompilation([src1, UnionAttributeSource]);
comp1.VerifyEmitDiagnostics();
Assert.True(comp1.GetTypeByMetadataName("S1").IsUnionType);
var src2 = @"
[System.Runtime.CompilerServices.Union]
struct S2
{
public object Value => null;
}
";
var comp2 = CreateCompilation([src2, UnionAttributeSource], references: [comp1.EmitToImageReference()]);
comp1.VerifyEmitDiagnostics();
Assert.True(comp2.GetTypeByMetadataName("S1").IsUnionType);
Assert.True(comp2.GetTypeByMetadataName("S2").IsUnionType);
}
[Fact]
public void CaseTypes_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public object Value => null;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(int x){}
public S2(string x){}
public object Value => null;
}
[System.Runtime.CompilerServices.Union]
struct S3
{
private S3(int x){}
internal S3(string x){}
public object Value => null;
}
[System.Runtime.CompilerServices.Union]
struct S4
{
public S4(int x, string y){}
public object Value => null;
}
[System.Runtime.CompilerServices.Union]
class C5
{
protected C5(int x){}
protected internal C5(string x){}
private protected C5(decimal x){}
public object Value => null;
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyEmitDiagnostics();
VerifyCaseTypes(comp, "S1", []);
VerifyCaseTypes(comp, "S2", ["System.Int32", "System.String"]);
VerifyCaseTypes(comp, "S3", []);
VerifyCaseTypes(comp, "S4", []);
VerifyCaseTypes(comp, "C5", []);
}
private static void VerifyCaseTypes(CSharpCompilation comp, string typeName, string[] caseTypes)
{
var type = comp.GetTypeByMetadataName(typeName);
Assert.True(type.IsUnionType);
AssertEx.SequenceEqual(caseTypes, type.UnionCaseTypes.ToTestDisplayStrings());
}
[Fact]
public void CaseTypes_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S2
{
#line 4
public static S2(int x){}
public object Value => null;
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (4,19): error CS0515: 'S2.S2(int)': access modifiers are not allowed on static constructors
// public static S2(int x){}
Diagnostic(ErrorCode.ERR_StaticConstructorWithAccessModifiers, "S2").WithArguments("S2.S2(int)").WithLocation(4, 19),
// (4,19): error CS0132: 'S2.S2(int)': a static constructor must be parameterless
// public static S2(int x){}
Diagnostic(ErrorCode.ERR_StaticConstParam, "S2").WithArguments("S2.S2(int)").WithLocation(4, 19)
);
VerifyCaseTypes(comp, "S2", []);
}
[Fact]
public void CaseTypes_03()
{
var src = @"
struct S2
{
public S2(int x){}
public S2(string x){}
public object Value => null;
}
";
var comp = CreateCompilation(src);
comp.VerifyEmitDiagnostics();
var type = comp.GetTypeByMetadataName("S2");
Assert.False(type.IsUnionType);
AssertEx.SequenceEqual([], type.UnionCaseTypes.ToTestDisplayStrings());
}
[Fact]
public void CaseTypes_04()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class C1
{
public C1(int x){}
public object Value => null;
}
[System.Runtime.CompilerServices.Union]
sealed class C2 : C1
{
public C2(string x) : base(0) {}
public new object Value => null;
}
class C3
{
public C3(int x){}
}
[System.Runtime.CompilerServices.Union]
sealed class C4 : C3
{
public C4(string x) : base(0) {}
public object Value => null;
}
sealed class C5 : C1
{
public C5(string x) : base(0) {}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyEmitDiagnostics();
VerifyCaseTypes(comp, "C1", ["System.Int32"]);
VerifyCaseTypes(comp, "C2", ["System.String"]);
VerifyCaseTypes(comp, "C4", ["System.String"]);
var c5 = comp.GetTypeByMetadataName("C5");
Assert.False(c5.IsUnionType);
AssertEx.SequenceEqual([], c5.UnionCaseTypes.ToTestDisplayStrings());
}
[Fact]
public void CaseTypes_05()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(string?[] x){}
#line 6
public S2(string[] x){}
public S2((int a, int b) x){}
public S2((int, int) x){}
public object Value => null!;
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (6,12): error CS0111: Type 'S2' already defines a member called 'S2' with the same parameter types
// public S2(string? x){}
Diagnostic(ErrorCode.ERR_MemberAlreadyExists, "S2").WithArguments("S2", "S2").WithLocation(6, 12),
// (8,12): error CS0111: Type 'S2' already defines a member called 'S2' with the same parameter types
// public S2((int, int) x){}
Diagnostic(ErrorCode.ERR_MemberAlreadyExists, "S2").WithArguments("S2", "S2").WithLocation(8, 12)
);
VerifyCaseTypes(comp, "S2", ["System.String?[]", "(System.Int32 a, System.Int32 b)"]);
}
[Fact]
public void CaseTypes_06()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int? x){}
public S1(string? x){}
public object? Value => null;
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyEmitDiagnostics();
VerifyCaseTypes(comp, "S1", ["System.Int32", "System.String"]);
}
[Fact]
public void UnionMatching_01_Discard_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
public S1() { Value = null; }
public S1(int x) { Value = x; }
public S1(string x) { Value = x; }
public object Value { get; }
}
class Program
{
static void Main()
{
System.Console.Write(Test(new S1(10)));
System.Console.Write(Test(null));
System.Console.Write(Test(new S1()));
}
static bool Test(S1 u)
{
if (u switch {_ => true })
{
return true;
}
return false;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueTrueTrue").VerifyDiagnostics();
verifier.VerifyIL("Program.Test", @"
{
// Code size 7 (0x7)
.maxstack 1
IL_0000: ldc.i4.1
IL_0001: brfalse.s IL_0005
IL_0003: ldc.i4.1
IL_0004: ret
IL_0005: ldc.i4.0
IL_0006: ret
}
");
}
[Fact]
public void UnionMatching_01_Discard_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1() { Value = null; }
public S1(int x) { Value = x; }
public S1(string x) { Value = x; }
public object Value { get; }
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default(S1)));
System.Console.Write(Test1(new S1()));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(null));
}
static bool Test1(S1 u)
{
if (u switch {_ => true })
{
return true;
}
return false;
}
static bool Test2(S1? u)
{
if (u switch {_ => true })
{
return true;
}
return false;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueTrueTrue TrueTrueTrueTrue").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 7 (0x7)
.maxstack 1
IL_0000: ldc.i4.1
IL_0001: brfalse.s IL_0005
IL_0003: ldc.i4.1
IL_0004: ret
IL_0005: ldc.i4.0
IL_0006: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 7 (0x7)
.maxstack 1
IL_0000: ldc.i4.1
IL_0001: brfalse.s IL_0005
IL_0003: ldc.i4.1
IL_0004: ret
IL_0005: ldc.i4.0
IL_0006: ret
}
");
}
[Fact]
public void UnionMatching_02_Var_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) { Value = x; }
public S1(string x) { Value = x; }
public object Value { get; }
public int Int => 123;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(null) is null);
}
static int Test1(S1 u)
{
return (u switch {var v => v }).Int;
}
static int? Test2(S1? u)
{
return (u switch {var v => v })?.Int;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "123123 123123True").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_02_Var_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
public S1(int x) { Value = x; }
public S1(string x) { Value = x; }
public object Value { get; }
public int Int => 123;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(null) is null);
}
static int? Test1(S1 u)
{
return (u switch {var v => v })?.Int;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "123True").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_03_Var_Deconstruct_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) { Value = x; }
public S1(string x) { Value = x; }
public object Value { get; }
public void Deconstruct(out int x, out int y) => throw null;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(null));
}
static int Test1(S1 u)
{
return (u switch {var (a, b) => a * 1000 + b * 10, _ => -1 } );
}
static int Test2(S1? u)
{
return (u switch {var (a, b) => a * 1000 + b * 10, _ => -1 } );
}
}
static class Extensions
{
public static void Deconstruct(this object o, out int x, out int y)
{
x = 1;
y = 2;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "1020-1 1020-1-1").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_03_Var_Deconstruct_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
public S1(int x) { Value = x; }
public S1(string x) { Value = x; }
public object Value { get; }
public void Deconstruct(out int x, out int y) => throw null;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(null));
}
static int Test2(S1 u)
{
return (u switch {var (a, b) => a * 1000 + b * 10, _ => -1 } );
}
}
static class Extensions
{
public static void Deconstruct(this object o, out int x, out int y)
{
x = 1;
y = 2;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "1020-1").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_04_Var_ITuple_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(C x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(new C())));
System.Console.Write(' ');
System.Console.Write(Test2((new S1(10), -1)));
System.Console.Write(Test2((default, -1)));
System.Console.Write(Test2((new S1(new C()), -1)));
System.Console.Write(' ');
System.Console.Write(Test3(new C2(new S1(10))));
System.Console.Write(Test3(new C2(default)));
System.Console.Write(Test3(new C2(new S1(new C()))));
}
static bool Test1(S1 u)
{
return u is var (_, i) && (int)i == 10;
}
static bool Test2((S1, int) u)
{
return u is var ((_, i), _) && (int)i == 10;
}
static bool Test3(C2 u)
{
return u is var (_, ((_, i), _, _)) && (int)i == 10;
}
}
public class C : System.Runtime.CompilerServices.ITuple
{
int System.Runtime.CompilerServices.ITuple.Length => 2;
object System.Runtime.CompilerServices.ITuple.this[int i] => i * 10;
}
class C2 : System.Runtime.CompilerServices.ITuple
{
private readonly S1 _value;
public C2(S1 x) { _value = x; }
int System.Runtime.CompilerServices.ITuple.Length => 2;
object System.Runtime.CompilerServices.ITuple.this[int i] => _value;
}
static class Extensions
{
public static void Deconstruct(this object o, out S1 x, out int y, out int z)
{
x = (S1)o;
y = 2;
z = 3;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "FalseFalseTrue FalseFalseTrue FalseFalseTrue" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
}
[Fact]
public void UnionMatching_04_Var_ITuple_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(C x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default(S1)));
System.Console.Write(Test1(new S1(new C())));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2((new S1(10), -1)));
System.Console.Write(Test2((default(S1), -1)));
System.Console.Write(Test2((new S1(new C()), -1)));
System.Console.Write(Test2((null, -1)));
System.Console.Write(' ');
System.Console.Write(Test3(new C2(new S1(10))));
System.Console.Write(Test3(new C2(default(S1))));
System.Console.Write(Test3(new C2(new S1(new C()))));
System.Console.Write(Test3(new C2(null)));
}
static bool Test1(S1? u)
{
return u is var (_, i) && (int)i == 10;
}
static bool Test2((S1?, int) u)
{
return u is var ((_, i), _) && (int)i == 10;
}
static bool Test3(C2 u)
{
return u is var (_, ((_, i), _, _)) && (int)i == 10;
}
}
public class C : System.Runtime.CompilerServices.ITuple
{
int System.Runtime.CompilerServices.ITuple.Length => 2;
object System.Runtime.CompilerServices.ITuple.this[int i] => i * 10;
}
class C2 : System.Runtime.CompilerServices.ITuple
{
private readonly S1? _value;
public C2(S1? x) { _value = x; }
int System.Runtime.CompilerServices.ITuple.Length => 2;
object System.Runtime.CompilerServices.ITuple.this[int i] => _value;
}
static class Extensions
{
public static void Deconstruct(this object o, out S1? x, out int y, out int z)
{
x = (S1?)o;
y = 2;
z = 3;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "FalseFalseTrueFalse FalseFalseTrueFalse FalseFalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
}
[Fact]
public void UnionMatching_04_Var_ITuple_03()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(C x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(new S1(new C())));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2((new S1(10), -1)));
System.Console.Write(Test2((new S1(new C()), -1)));
System.Console.Write(Test2((null, -1)));
System.Console.Write(' ');
System.Console.Write(Test3(new C2(new S1(10))));
System.Console.Write(Test3(new C2(new S1(new C()))));
System.Console.Write(Test3(new C2(null)));
}
static bool Test1(S1 u)
{
return u is var (_, i) && (int)i == 10;
}
static bool Test2((S1, int) u)
{
return u is var ((_, i), _) && (int)i == 10;
}
static bool Test3(C2 u)
{
return u is var (_, ((_, i), _, _)) && (int)i == 10;
}
}
public class C : System.Runtime.CompilerServices.ITuple
{
int System.Runtime.CompilerServices.ITuple.Length => 2;
object System.Runtime.CompilerServices.ITuple.this[int i] => i * 10;
}
class C2 : System.Runtime.CompilerServices.ITuple
{
private readonly S1 _value;
public C2(S1 x) { _value = x; }
int System.Runtime.CompilerServices.ITuple.Length => 2;
object System.Runtime.CompilerServices.ITuple.this[int i] => _value;
}
static class Extensions
{
public static void Deconstruct(this object o, out S1 x, out int y, out int z)
{
x = (S1)o;
y = 2;
z = 3;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "FalseTrueFalse FalseTrueFalse FalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
}
[Fact]
public void UnionMatching_05_Constant_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(default));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test4(new S1(11)));
System.Console.Write(Test4(default));
System.Console.Write(Test4(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test5(new S1(10)));
System.Console.Write(Test5(default(S1)));
System.Console.Write(Test5(new S1(""11"")));
System.Console.Write(Test5(new S1(0)));
System.Console.Write(Test5(null));
}
static bool Test1(S1 u)
{
return u is 10;
}
static bool Test2(S1 u)
{
return u is 10 or 11;
}
static bool Test3(S1 u)
{
return u is ""11"" and ['1', '1'];
}
static bool Test4(S1 u)
{
return u is null;
}
static bool Test5(S1? u)
{
return u is 10;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseFalseTrue FalseFalseTrue FalseTrueFalse TrueFalseFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 29 (0x1d)
.maxstack 2
.locals init (object V_0)
IL_0000: ldarga.s V_0
IL_0002: call ""object S1.Value.get""
IL_0007: stloc.0
IL_0008: ldloc.0
IL_0009: isinst ""int""
IL_000e: brfalse.s IL_001b
IL_0010: ldloc.0
IL_0011: unbox.any ""int""
IL_0016: ldc.i4.s 10
IL_0018: ceq
IL_001a: ret
IL_001b: ldc.i4.0
IL_001c: ret
}
");
verifier.VerifyIL("Program.Test5", @"
{
// Code size 46 (0x2e)
.maxstack 2
.locals init (S1 V_0,
object V_1)
IL_0000: ldarga.s V_0
IL_0002: call ""readonly bool S1?.HasValue.get""
IL_0007: brfalse.s IL_002c
IL_0009: ldarga.s V_0
IL_000b: call ""readonly S1 S1?.GetValueOrDefault()""
IL_0010: stloc.0
IL_0011: ldloca.s V_0
IL_0013: call ""object S1.Value.get""
IL_0018: stloc.1
IL_0019: ldloc.1
IL_001a: isinst ""int""
IL_001f: brfalse.s IL_002c
IL_0021: ldloc.1
IL_0022: unbox.any ""int""
IL_0027: ldc.i4.s 10
IL_0029: ceq
IL_002b: ret
IL_002c: ldc.i4.0
IL_002d: ret
}
");
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseFalseTrue FalseFalseTrue FalseTrueFalse TrueFalseFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (47,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is 10;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(47, 21),
// (52,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is 10 or 11;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(52, 21),
// (52,27): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is 10 or 11;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "11").WithArguments("unions").WithLocation(52, 27),
// (57,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is "11" and ['1', '1'];
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"""11""").WithArguments("unions").WithLocation(57, 21),
// (62,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is null;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "null").WithArguments("unions").WithLocation(62, 21),
// (67,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is 10;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(67, 21)
);
}
[Fact]
public void UnionMatching_05_Constant_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(default));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test4(new S1(11)));
System.Console.Write(Test4(default));
System.Console.Write(Test4(new S1(""11"")));
}
static bool Test1(S1 u)
{
return u is 10;
}
static bool Test2(S1 u)
{
return u is 10 or 11;
}
static bool Test3(S1 u)
{
return u is ""11"" and ['1', '1'];
}
static bool Test4(S1 u)
{
return u is null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseFalseTrue FalseFalseTrue FalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 31 (0x1f)
.maxstack 2
.locals init (object V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_001d
IL_0003: ldarg.0
IL_0004: callvirt ""object S1.Value.get""
IL_0009: stloc.0
IL_000a: ldloc.0
IL_000b: isinst ""int""
IL_0010: brfalse.s IL_001d
IL_0012: ldloc.0
IL_0013: unbox.any ""int""
IL_0018: ldc.i4.s 10
IL_001a: ceq
IL_001c: ret
IL_001d: ldc.i4.0
IL_001e: ret
}
");
}
[Fact]
public void UnionMatching_06_Constant_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
class C1
{
private readonly object _value;
public C1() {}
public C1(int x) { _value = x; }
public C1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(11)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new C1(11)));
System.Console.Write(Test2(new C1()));
System.Console.Write(Test2(new C1(""11"")));
System.Console.Write(Test2(null));
}
static bool Test1(S1? u)
{
return u is null;
}
static bool Test2(C1 u)
{
return u is null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "FalseTrueFalseTrue FalseTrueFalseTrue").VerifyDiagnostics();
verifier.VerifyIL("Program.Test2", @"
{
// Code size 19 (0x13)
.maxstack 1
.locals init (bool V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000b
IL_0003: ldarg.0
IL_0004: callvirt ""object C1.Value.get""
IL_0009: brtrue.s IL_000f
IL_000b: ldc.i4.1
IL_000c: stloc.0
IL_000d: br.s IL_0011
IL_000f: ldc.i4.0
IL_0010: stloc.0
IL_0011: ldloc.0
IL_0012: ret
}
");
verifier.VerifyIL("Program.Test1", @"
{
// Code size 34 (0x22)
.maxstack 1
.locals init (S1 V_0,
bool V_1)
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1?.HasValue.get""
IL_0007: brfalse.s IL_001a
IL_0009: ldarga.s V_0
IL_000b: call ""S1 S1?.GetValueOrDefault()""
IL_0010: stloc.0
IL_0011: ldloca.s V_0
IL_0013: call ""object S1.Value.get""
IL_0018: brtrue.s IL_001e
IL_001a: ldc.i4.1
IL_001b: stloc.1
IL_001c: br.s IL_0020
IL_001e: ldc.i4.0
IL_001f: stloc.1
IL_0020: ldloc.1
IL_0021: ret
}
");
}
[Fact]
public void UnionMatching_06_Constant_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
class C1
{
private readonly object _value;
public C1() {}
public C1(int x) { _value = x; }
public C1(C2 x) { _value = x; }
public object Value => _value;
}
class C2;
[System.Runtime.CompilerServices.Union]
struct S2
{
private readonly object _value;
public S2(int x) { _value = x; }
public S2(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static bool Test1(S1? u)
{
#line 100
return u is (string)null;
}
static bool Test2(C1 u)
{
#line 200
return u is (string)null;
}
static bool Test3(S1 u)
{
#line 300
return u is (string)null;
}
static bool Test4(C2 u)
{
#line 400
return u is (string)null;
}
static bool Test5(S2 u)
{
#line 500
return u is null;
}
static bool Test6(C2 u)
{
#line 600
return u is (object)null;
}
static bool Test7(string u)
{
#line 700
return u is (object)null;
}
static bool Test8(S2 u)
{
#line 800
return u is (object)null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,21): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// return u is (string)null;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "(string)null").WithArguments("S1").WithLocation(100, 21),
// (100,21): error CS0029: Cannot implicitly convert type 'string' to 'int'
// return u is (string)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(string)null").WithArguments("string", "int").WithLocation(100, 21),
// (100,21): error CS0029: Cannot implicitly convert type 'string' to 'C2'
// return u is (string)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(string)null").WithArguments("string", "C2").WithLocation(100, 21),
// (200,21): error CS9372: An expression of type 'C1' cannot be handled by this pattern, see additional errors at this location.
// return u is (string)null;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "(string)null").WithArguments("C1").WithLocation(200, 21),
// (200,21): error CS0029: Cannot implicitly convert type 'string' to 'int'
// return u is (string)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(string)null").WithArguments("string", "int").WithLocation(200, 21),
// (200,21): error CS0029: Cannot implicitly convert type 'string' to 'C2'
// return u is (string)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(string)null").WithArguments("string", "C2").WithLocation(200, 21),
// (300,21): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// return u is (string)null;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "(string)null").WithArguments("S1").WithLocation(300, 21),
// (300,21): error CS0029: Cannot implicitly convert type 'string' to 'int'
// return u is (string)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(string)null").WithArguments("string", "int").WithLocation(300, 21),
// (300,21): error CS0029: Cannot implicitly convert type 'string' to 'C2'
// return u is (string)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(string)null").WithArguments("string", "C2").WithLocation(300, 21),
// (400,21): error CS0029: Cannot implicitly convert type 'string' to 'C2'
// return u is (string)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(string)null").WithArguments("string", "C2").WithLocation(400, 21),
// (600,21): error CS0266: Cannot implicitly convert type 'object' to 'C2'. An explicit conversion exists (are you missing a cast?)
// return u is (object)null;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "(object)null").WithArguments("object", "C2").WithLocation(600, 21),
// (700,21): error CS0266: Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
// return u is (object)null;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "(object)null").WithArguments("object", "string").WithLocation(700, 21),
// (800,21): error CS9372: An expression of type 'S2' cannot be handled by this pattern, see additional errors at this location.
// return u is (object)null;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "(object)null").WithArguments("S2").WithLocation(800, 21),
// (800,21): error CS0266: Cannot implicitly convert type 'object' to 'int'. An explicit conversion exists (are you missing a cast?)
// return u is (object)null;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "(object)null").WithArguments("object", "int").WithLocation(800, 21),
// (800,21): error CS0266: Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
// return u is (object)null;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "(object)null").WithArguments("object", "string").WithLocation(800, 21)
);
}
[Fact]
public void UnionMatching_07_Constant_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test4(new S1(11)));
System.Console.Write(Test4(default));
System.Console.Write(Test4(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test10(new S1(10)));
System.Console.Write(Test10(default));
System.Console.Write(Test10(new S1(""11"")));
System.Console.Write(Test10(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test40(new S1(11)));
System.Console.Write(Test40(default));
System.Console.Write(Test40(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test100(new S1(10)));
System.Console.Write(Test100(default));
System.Console.Write(Test100(new S1(""11"")));
System.Console.Write(Test100(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test400(new S1(11)));
System.Console.Write(Test400(default));
System.Console.Write(Test400(new S1(""11"")));
}
const int _int_10 = 10;
const string _string_null = null;
const object _object_null = null;
static bool Test1(S1 u)
{
return u switch { _int_10 => true, _ => false };
}
static bool Test4(S1 u)
{
return u switch { _string_null => true, _ => false };
}
static bool Test10(S1 u)
{
return u is _int_10;
}
static bool Test40(S1 u)
{
return u is _string_null;
}
static bool Test100(S1 u)
{
switch (u)
{
case _int_10: return true;
};
return false;
}
static bool Test400(S1 u)
{
switch (u)
{
case _string_null: return true;
};
return false;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalse FalseTrueFalse TrueFalseFalseFalse FalseTrueFalse TrueFalseFalseFalse FalseTrueFalse").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_07_Constant_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
const object _object_null = null;
static bool Test5(S1 u)
{
return u switch { _object_null => true, _ => false };
}
static bool Test50(S1 u)
{
return u is _object_null;
}
static bool Test500(S1 u)
{
switch (u)
{
case _object_null: return true;
};
return false;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (17,27): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// return u switch { _object_null => true, _ => false };
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "_object_null").WithArguments("S1").WithLocation(17, 27),
// (17,27): error CS0266: Cannot implicitly convert type 'object' to 'int'. An explicit conversion exists (are you missing a cast?)
// return u switch { _object_null => true, _ => false };
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "int").WithLocation(17, 27),
// (17,27): error CS0266: Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
// return u switch { _object_null => true, _ => false };
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "string").WithLocation(17, 27),
// (22,21): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// return u is _object_null;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "_object_null").WithArguments("S1").WithLocation(22, 21),
// (22,21): error CS0266: Cannot implicitly convert type 'object' to 'int'. An explicit conversion exists (are you missing a cast?)
// return u is _object_null;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "int").WithLocation(22, 21),
// (22,21): error CS0266: Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
// return u is _object_null;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "string").WithLocation(22, 21),
// (29,18): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// case _object_null: return true;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "_object_null").WithArguments("S1").WithLocation(29, 18),
// (29,18): error CS0266: Cannot implicitly convert type 'object' to 'int'. An explicit conversion exists (are you missing a cast?)
// case _object_null: return true;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "int").WithLocation(29, 18),
// (29,18): error CS0266: Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
// case _object_null: return true;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "string").WithLocation(29, 18)
);
}
[Fact]
public void UnionMatching_07_Constant_03()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default(S1)));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test10(new S1(10)));
System.Console.Write(Test10(default(S1)));
System.Console.Write(Test10(new S1(""11"")));
System.Console.Write(Test10(new S1(0)));
System.Console.Write(Test10(null));
System.Console.Write(' ');
System.Console.Write(Test100(new S1(10)));
System.Console.Write(Test100(default(S1)));
System.Console.Write(Test100(new S1(""11"")));
System.Console.Write(Test100(new S1(0)));
System.Console.Write(Test100(null));
}
const int _int_10 = 10;
static bool Test1(S1? u)
{
return u switch { _int_10 => true, _ => false };
}
static bool Test10(S1? u)
{
return u is _int_10;
}
static bool Test100(S1? u)
{
switch (u)
{
case _int_10: return true;
};
return false;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalseFalse TrueFalseFalseFalseFalse TrueFalseFalseFalseFalse").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_07_Constant_04()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
const string _string_null = null;
const object _object_null = null;
static bool Test4(S1? u)
{
return u switch { _string_null => true, _ => false };
}
static bool Test5(S1? u)
{
return u switch { _object_null => true, _ => false };
}
static bool Test40(S1? u)
{
return u is _string_null;
}
static bool Test50(S1? u)
{
return u is _object_null;
}
static bool Test400(S1? u)
{
switch (u)
{
case _string_null: return true;
};
return false;
}
static bool Test500(S1? u)
{
switch (u)
{
case _object_null: return true;
};
return false;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (18,27): error CS9135: A constant value of type 'S1' is expected
// return u switch { _string_null => true, _ => false };
Diagnostic(ErrorCode.ERR_ConstantValueOfTypeExpected, "_string_null").WithArguments("S1").WithLocation(18, 27),
// (23,27): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// return u switch { _object_null => true, _ => false };
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "_object_null").WithArguments("S1").WithLocation(23, 27),
// (23,27): error CS0266: Cannot implicitly convert type 'object' to 'int'. An explicit conversion exists (are you missing a cast?)
// return u switch { _object_null => true, _ => false };
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "int").WithLocation(23, 27),
// (23,27): error CS0266: Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
// return u switch { _object_null => true, _ => false };
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "string").WithLocation(23, 27),
// (28,21): error CS9135: A constant value of type 'S1' is expected
// return u is _string_null;
Diagnostic(ErrorCode.ERR_ConstantValueOfTypeExpected, "_string_null").WithArguments("S1").WithLocation(28, 21),
// (33,21): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// return u is _object_null;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "_object_null").WithArguments("S1").WithLocation(33, 21),
// (33,21): error CS0266: Cannot implicitly convert type 'object' to 'int'. An explicit conversion exists (are you missing a cast?)
// return u is _object_null;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "int").WithLocation(33, 21),
// (33,21): error CS0266: Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
// return u is _object_null;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "string").WithLocation(33, 21),
// (40,18): error CS9135: A constant value of type 'S1' is expected
// case _string_null: return true;
Diagnostic(ErrorCode.ERR_ConstantValueOfTypeExpected, "_string_null").WithArguments("S1").WithLocation(40, 18),
// (50,18): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// case _object_null: return true;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "_object_null").WithArguments("S1").WithLocation(50, 18),
// (50,18): error CS0266: Cannot implicitly convert type 'object' to 'int'. An explicit conversion exists (are you missing a cast?)
// case _object_null: return true;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "int").WithLocation(50, 18),
// (50,18): error CS0266: Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
// case _object_null: return true;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "string").WithLocation(50, 18)
);
}
[Fact]
public void UnionMatching_07_Constant_05()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(S1 x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(null));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test4(new S1(11)));
System.Console.Write(Test4(null));
System.Console.Write(Test4(new S1(""11"")));
System.Console.Write(Test4(new S1((string)null)));
System.Console.Write(' ');
System.Console.Write(Test10(new S1(10)));
System.Console.Write(Test10(null));
System.Console.Write(Test10(new S1(""11"")));
System.Console.Write(Test10(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test40(new S1(11)));
System.Console.Write(Test40(null));
System.Console.Write(Test40(new S1(""11"")));
System.Console.Write(Test40(new S1((string)null)));
System.Console.Write(' ');
System.Console.Write(Test100(new S1(10)));
System.Console.Write(Test100(null));
System.Console.Write(Test100(new S1(""11"")));
System.Console.Write(Test100(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test400(new S1(11)));
System.Console.Write(Test400(null));
System.Console.Write(Test400(new S1(""11"")));
System.Console.Write(Test400(new S1((string)null)));
}
const int _int_10 = 10;
const S1 _S1_null = null;
static bool Test1(S1 u)
{
return u switch { _int_10 => true, _ => false };
}
static bool Test4(S1 u)
{
return u switch { _S1_null => true, _ => false };
}
static bool Test10(S1 u)
{
return u is _int_10;
}
static bool Test40(S1 u)
{
return u is _S1_null;
}
static bool Test100(S1 u)
{
switch (u)
{
case _int_10: return true;
};
return false;
}
static bool Test400(S1 u)
{
switch (u)
{
case _S1_null: return true;
};
return false;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalse FalseTrueFalseTrue TrueFalseFalseFalse FalseTrueFalseTrue TrueFalseFalseFalse FalseTrueFalseTrue").VerifyDiagnostics();
verifier.VerifyIL("Program.Test4",
@"
{
// Code size 19 (0x13)
.maxstack 1
.locals init (bool V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000b
IL_0003: ldarg.0
IL_0004: callvirt ""object S1.Value.get""
IL_0009: brtrue.s IL_000f
IL_000b: ldc.i4.1
IL_000c: stloc.0
IL_000d: br.s IL_0011
IL_000f: ldc.i4.0
IL_0010: stloc.0
IL_0011: ldloc.0
IL_0012: ret
}
");
verifier.VerifyIL("Program.Test40",
@"
{
// Code size 19 (0x13)
.maxstack 1
.locals init (bool V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000b
IL_0003: ldarg.0
IL_0004: callvirt ""object S1.Value.get""
IL_0009: brtrue.s IL_000f
IL_000b: ldc.i4.1
IL_000c: stloc.0
IL_000d: br.s IL_0011
IL_000f: ldc.i4.0
IL_0010: stloc.0
IL_0011: ldloc.0
IL_0012: ret
}
");
verifier.VerifyIL("Program.Test400",
@"
{
// Code size 15 (0xf)
.maxstack 1
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000b
IL_0003: ldarg.0
IL_0004: callvirt ""object S1.Value.get""
IL_0009: brtrue.s IL_000d
IL_000b: ldc.i4.1
IL_000c: ret
IL_000d: ldc.i4.0
IL_000e: ret
}
");
}
[Fact]
public void UnionMatching_07_Constant_06()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
const string _string_null = null;
const object _object_null = null;
static bool Test4(S1 u)
{
return u switch { _string_null => true, _ => false };
}
static bool Test5(S1 u)
{
return u switch { _object_null => true, _ => false };
}
static bool Test40(S1 u)
{
return u is _string_null;
}
static bool Test50(S1 u)
{
return u is _object_null;
}
static bool Test400(S1 u)
{
switch (u)
{
case _string_null: return true;
};
return false;
}
static bool Test500(S1 u)
{
switch (u)
{
case _object_null: return true;
};
return false;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (18,27): error CS9135: A constant value of type 'S1' is expected
// return u switch { _string_null => true, _ => false };
Diagnostic(ErrorCode.ERR_ConstantValueOfTypeExpected, "_string_null").WithArguments("S1").WithLocation(18, 27),
// (23,27): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// return u switch { _object_null => true, _ => false };
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "_object_null").WithArguments("S1").WithLocation(23, 27),
// (23,27): error CS0266: Cannot implicitly convert type 'object' to 'int'. An explicit conversion exists (are you missing a cast?)
// return u switch { _object_null => true, _ => false };
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "int").WithLocation(23, 27),
// (23,27): error CS0266: Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
// return u switch { _object_null => true, _ => false };
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "string").WithLocation(23, 27),
// (28,21): error CS9135: A constant value of type 'S1' is expected
// return u is _string_null;
Diagnostic(ErrorCode.ERR_ConstantValueOfTypeExpected, "_string_null").WithArguments("S1").WithLocation(28, 21),
// (33,21): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// return u is _object_null;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "_object_null").WithArguments("S1").WithLocation(33, 21),
// (33,21): error CS0266: Cannot implicitly convert type 'object' to 'int'. An explicit conversion exists (are you missing a cast?)
// return u is _object_null;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "int").WithLocation(33, 21),
// (33,21): error CS0266: Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
// return u is _object_null;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "string").WithLocation(33, 21),
// (40,18): error CS9135: A constant value of type 'S1' is expected
// case _string_null: return true;
Diagnostic(ErrorCode.ERR_ConstantValueOfTypeExpected, "_string_null").WithArguments("S1").WithLocation(40, 18),
// (50,18): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// case _object_null: return true;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "_object_null").WithArguments("S1").WithLocation(50, 18),
// (50,18): error CS0266: Cannot implicitly convert type 'object' to 'int'. An explicit conversion exists (are you missing a cast?)
// case _object_null: return true;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "int").WithLocation(50, 18),
// (50,18): error CS0266: Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?)
// case _object_null: return true;
Diagnostic(ErrorCode.ERR_NoImplicitConvCast, "_object_null").WithArguments("object", "string").WithLocation(50, 18)
);
}
[Fact]
public void UnionMatching_08_Recursive_Property_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(S2<int> x) { _value = x; }
public S1(S2<string> x) { _value = x; }
public S1(S2<object> x) { _value = x; }
public object Value => _value;
}
struct S2<T>
{
public T Value;
}
class A;
class B;
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test1(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(Test2(default));
System.Console.Write(Test2(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test2(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(Test2(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(Test3(default));
System.Console.Write(Test3(new S1(new S2<string>() { Value = ""11"" })));
}
static bool Test1(S1 u)
{
return u is S2<int> { Value: 10 };
}
static bool Test2(S1 u)
{
return u is S2<int> { Value: 10 or 11 };
}
static bool Test3(S1 u)
{
return u is S2<string> { Value: ""11"" } and { Value: ['1', '1'] };
}
static bool Test4(S1 u)
{
#line 58
return u is S2<object> { Value: not A or B };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseFalseTrue FalseFalseTrue" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics(
// (58,50): warning CS9336: The pattern is redundant.
// return u is S2<object> { Value: not A or B };
Diagnostic(ErrorCode.WRN_RedundantPattern, "B").WithLocation(58, 50)
);
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseFalseTrue FalseFalseTrue" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics(
// (58,50): warning CS9336: The pattern is redundant.
// return u is S2<object> { Value: not A or B };
Diagnostic(ErrorCode.WRN_RedundantPattern, "B").WithLocation(58, 50)
);
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (44,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<int> { Value: 10 };
Diagnostic(ErrorCode.ERR_FeatureInPreview, "S2<int> { Value: 10 }").WithArguments("unions").WithLocation(44, 21),
// (49,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<int> { Value: 10 or 11 };
Diagnostic(ErrorCode.ERR_FeatureInPreview, "S2<int> { Value: 10 or 11 }").WithArguments("unions").WithLocation(49, 21),
// (54,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<string> { Value: "11" } and { Value: ['1', '1'] };
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"S2<string> { Value: ""11"" }").WithArguments("unions").WithLocation(54, 21),
// (58,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<object> { Value: not A or B };
Diagnostic(ErrorCode.ERR_FeatureInPreview, "S2<object> { Value: not A or B }").WithArguments("unions").WithLocation(58, 21),
// (58,50): warning CS9336: The pattern is redundant.
// return u is S2<object> { Value: not A or B };
Diagnostic(ErrorCode.WRN_RedundantPattern, "B").WithLocation(58, 50)
);
}
[Fact]
public void UnionMatching_08_Recursive_Property_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(S2<int> x) { _value = x; }
public S1(S2<string> x) { _value = x; }
public S1(S2<object> x) { _value = x; }
public object Value => _value;
}
struct S2<T>
{
public T Value;
}
class A;
class B;
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(Test1(default(S1)));
System.Console.Write(Test1(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test1(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test2(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(Test2(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(Test2(null));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(Test3(default(S1)));
System.Console.Write(Test3(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test3(null));
}
static bool Test1(S1? u)
{
return u is S2<int> { Value: 10 };
}
static bool Test2(S1? u)
{
return u is S2<int> { Value: 10 or 11 };
}
static bool Test3(S1? u)
{
return u is S2<string> { Value: ""11"" } and { Value: ['1', '1'] };
}
static bool Test4(S1? u)
{
#line 58
return u is S2<object> { Value: not A or B };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalseFalse TrueFalseFalseFalseTrueFalse FalseFalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics(
// (58,50): warning CS9336: The pattern is redundant.
// return u is S2<object> { Value: not A or B };
Diagnostic(ErrorCode.WRN_RedundantPattern, "B").WithLocation(58, 50)
);
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalseFalse TrueFalseFalseFalseTrueFalse FalseFalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics(
// (58,50): warning CS9336: The pattern is redundant.
// return u is S2<object> { Value: not A or B };
Diagnostic(ErrorCode.WRN_RedundantPattern, "B").WithLocation(58, 50)
);
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (47,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<int> { Value: 10 };
Diagnostic(ErrorCode.ERR_FeatureInPreview, "S2<int> { Value: 10 }").WithArguments("unions").WithLocation(47, 21),
// (52,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<int> { Value: 10 or 11 };
Diagnostic(ErrorCode.ERR_FeatureInPreview, "S2<int> { Value: 10 or 11 }").WithArguments("unions").WithLocation(52, 21),
// (57,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<string> { Value: "11" } and { Value: ['1', '1'] };
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"S2<string> { Value: ""11"" }").WithArguments("unions").WithLocation(57, 21),
// (58,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<object> { Value: not A or B };
Diagnostic(ErrorCode.ERR_FeatureInPreview, "S2<object> { Value: not A or B }").WithArguments("unions").WithLocation(58, 21),
// (58,50): warning CS9336: The pattern is redundant.
// return u is S2<object> { Value: not A or B };
Diagnostic(ErrorCode.WRN_RedundantPattern, "B").WithLocation(58, 50)
);
}
[Fact]
public void UnionMatching_08_Recursive_Property_03()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(S2<int> x) { _value = x; }
public S1(S2<string> x) { _value = x; }
public S1(S2<object> x) { _value = x; }
public object Value => _value;
}
struct S2<T>
{
public T Value;
}
class A;
class B;
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(Test1(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test1(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(Test2(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test2(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(Test2(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(Test2(null));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(Test3(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test3(null));
}
static bool Test1(S1 u)
{
return u is S2<int> { Value: 10 };
}
static bool Test2(S1 u)
{
return u is S2<int> { Value: 10 or 11 };
}
static bool Test3(S1 u)
{
return u is S2<string> { Value: ""11"" } and { Value: ['1', '1'] };
}
static bool Test4(S1 u)
{
#line 58
return u is S2<object> { Value: not A or B };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseTrueFalse FalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics(
// (58,50): warning CS9336: The pattern is redundant.
// return u is S2<object> { Value: not A or B };
Diagnostic(ErrorCode.WRN_RedundantPattern, "B").WithLocation(58, 50)
);
}
[Fact]
public void UnionMatching_09_Recursive_ITuple()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(C x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(new C())));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1(new C())));
System.Console.Write(Test2(null));
}
static bool Test1(S1 u)
{
return u is (_, 10);
}
static bool Test2(S1? u)
{
return u is (_, 10);
}
}
public class C : System.Runtime.CompilerServices.ITuple
{
int System.Runtime.CompilerServices.ITuple.Length => 2;
object System.Runtime.CompilerServices.ITuple.this[int i] => i * 10;
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "FalseFalseTrue FalseFalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "FalseFalseTrue FalseFalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (27,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (_, 10);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "(_, 10)").WithArguments("unions").WithLocation(27, 21),
// (32,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (_, 10);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "(_, 10)").WithArguments("unions").WithLocation(32, 21)
);
}
[Fact]
public void UnionMatching_10_Recursive_Deconstruct_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(S2<int> x) { _value = x; }
public S1(S2<string> x) { _value = x; }
public S1(S2<object> x) { _value = x; }
public object Value => _value;
}
struct S2<T>
{
public T Value;
public void Deconstruct(out T value, out int x)
{
value = Value;
x = 0;
}
}
class A;
class B;
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test1(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(Test2(default));
System.Console.Write(Test2(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test2(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(Test2(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(Test3(default));
System.Console.Write(Test3(new S1(new S2<string>() { Value = ""11"" })));
}
static bool Test1(S1 u)
{
return u is S2<int> (10, _);
}
static bool Test2(S1 u)
{
return u is S2<int> (10 or 11, _);
}
static bool Test3(S1 u)
{
return u is S2<string> (""11"", _) and (['1', '1'], _);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseFalseTrue FalseFalseTrue" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseFalseTrue FalseFalseTrue" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (50,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<int> (10, _);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "S2<int> (10, _)").WithArguments("unions").WithLocation(50, 21),
// (55,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<int> (10 or 11, _);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "S2<int> (10 or 11, _)").WithArguments("unions").WithLocation(55, 21),
// (60,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<string> ("11", _) and (['1', '1'], _);
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"S2<string> (""11"", _)").WithArguments("unions").WithLocation(60, 21)
);
}
[Fact]
public void UnionMatching_10_Recursive_Deconstruct_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(S2<int> x) { _value = x; }
public S1(S2<string> x) { _value = x; }
public S1(S2<object> x) { _value = x; }
public object Value => _value;
}
struct S2<T>
{
public T Value;
public void Deconstruct(out T value, out int x)
{
value = Value;
x = 0;
}
}
class A;
class B;
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(Test1(default(S1)));
System.Console.Write(Test1(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test1(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test2(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(Test2(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(Test2(null));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(Test3(default(S1)));
System.Console.Write(Test3(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(Test3(null));
}
static bool Test1(S1? u)
{
return u is S2<int> (10, _);
}
static bool Test2(S1? u)
{
return u is S2<int> (10 or 11, _);
}
static bool Test3(S1? u)
{
return u is S2<string> (""11"", _) and (['1', '1'], _);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalseFalse TrueFalseFalseFalseTrueFalse FalseFalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalseFalse TrueFalseFalseFalseTrueFalse FalseFalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (53,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<int> (10, _);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "S2<int> (10, _)").WithArguments("unions").WithLocation(53, 21),
// (58,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<int> (10 or 11, _);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "S2<int> (10 or 11, _)").WithArguments("unions").WithLocation(58, 21),
// (63,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is S2<string> ("11", _) and (['1', '1'], _);
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"S2<string> (""11"", _)").WithArguments("unions").WithLocation(63, 21)
);
}
[Fact]
public void UnionMatching_11_Type()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(null));
}
static bool Test1(S1 u)
{
return u is int;
}
static bool Test2(S1? u)
{
return u is int;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseFalseTrue TrueFalseFalseTrueFalse").VerifyDiagnostics();
var tree = comp.SyntaxTrees[0];
AssertEx.Equal(["u is int", "u is int"], tree.GetRoot().DescendantNodes().OfType<BinaryExpressionSyntax>().Select(b => b.ToString()));
verifier.VerifyIL("Program.Test1", @"
{
// Code size 16 (0x10)
.maxstack 2
IL_0000: ldarga.s V_0
IL_0002: call ""object S1.Value.get""
IL_0007: isinst ""int""
IL_000c: ldnull
IL_000d: cgt.un
IL_000f: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 35 (0x23)
.maxstack 2
.locals init (S1 V_0)
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1?.HasValue.get""
IL_0007: brfalse.s IL_0021
IL_0009: ldarga.s V_0
IL_000b: call ""S1 S1?.GetValueOrDefault()""
IL_0010: stloc.0
IL_0011: ldloca.s V_0
IL_0013: call ""object S1.Value.get""
IL_0018: isinst ""int""
IL_001d: ldnull
IL_001e: cgt.un
IL_0020: ret
IL_0021: ldc.i4.0
IL_0022: ret
}
");
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseTrue TrueFalseFalseTrueFalse").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (29,16): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is int;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "u is int").WithArguments("unions").WithLocation(29, 16),
// (34,16): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is int;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "u is int").WithArguments("unions").WithLocation(34, 16)
);
}
[Fact]
public void UnionMatching_12_Type_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(default));
System.Console.Write(Test3(new S1(""11"")));
}
static bool Test1(S1 u)
{
return u switch { int => true, _ => false };
}
static bool Test3(S1 u)
{
return u is string and ['1', '1'];
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseTrue FalseFalseTrue" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseTrue FalseFalseTrue" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (28,27): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u switch { int => true, _ => false };
Diagnostic(ErrorCode.ERR_FeatureInPreview, "int").WithArguments("unions").WithLocation(28, 27),
// (33,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is string and ['1', '1'];
Diagnostic(ErrorCode.ERR_FeatureInPreview, "string").WithArguments("unions").WithLocation(33, 21)
);
}
[Fact]
public void UnionMatching_12_Type_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default(S1)));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(default(S1)));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(Test3(null));
}
static bool Test1(S1? u)
{
return u switch { int => true, _ => false };
}
static bool Test3(S1? u)
{
return u is string and ['1', '1'];
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseTrueFalse FalseFalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseTrueFalse FalseFalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (30,27): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u switch { int => true, _ => false };
Diagnostic(ErrorCode.ERR_FeatureInPreview, "int").WithArguments("unions").WithLocation(30, 27),
// (35,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is string and ['1', '1'];
Diagnostic(ErrorCode.ERR_FeatureInPreview, "string").WithArguments("unions").WithLocation(35, 21)
);
}
[Fact]
public void UnionMatching_13_Declaration_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(new S1(11)));
}
static bool Test1(S1 u)
{
return u is int x;
}
static bool Test2(S1 u)
{
return u is int x ? (x == 10 || x == 11) : false;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseTrue TrueFalseFalseFalseTrue").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseTrue TrueFalseFalseFalseTrue").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (30,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is int x;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "int x").WithArguments("unions").WithLocation(30, 21),
// (35,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is int x ? (x == 10 || x == 11) : false;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "int x").WithArguments("unions").WithLocation(35, 21)
);
}
[Fact]
public void UnionMatching_13_Declaration_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default(S1)));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(Test2(null));
}
static bool Test1(S1? u)
{
return u is int x;
}
static bool Test2(S1? u)
{
return u is int x ? (x == 10 || x == 11) : false;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseTrueFalse TrueFalseFalseFalseTrueFalse").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseTrueFalse TrueFalseFalseFalseTrueFalse").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (32,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is int x;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "int x").WithArguments("unions").WithLocation(32, 21),
// (37,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is int x ? (x == 10 || x == 11) : false;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "int x").WithArguments("unions").WithLocation(37, 21)
);
}
[Fact]
public void UnionMatching_14_Negated_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(default));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test4(new S1(11)));
System.Console.Write(Test4(default));
System.Console.Write(Test4(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test5(new S1(10)));
System.Console.Write(Test5(default));
System.Console.Write(Test5(new S1(""11"")));
System.Console.Write(Test5(new S1(0)));
}
static bool Test1(S1 u)
{
return u is not 10;
}
static bool Test2(S1 u)
{
return u is not (10 or 11);
}
static bool Test3(S1 u)
{
return u is not (""11"" and ['1', '1']);
}
static bool Test4(S1 u)
{
return u is not null;
}
static bool Test5(S1 u)
{
return u is not ({ } and int);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "FalseTrueTrueTrue FalseTrueTrueTrueFalse TrueTrueFalse TrueFalseTrue FalseTrueTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "FalseTrueTrueTrue FalseTrueTrueTrueFalse TrueTrueFalse TrueFalseTrue FalseTrueTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (46,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is not 10;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "not 10").WithArguments("unions").WithLocation(46, 21),
// (51,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is not (10 or 11);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "not (10 or 11)").WithArguments("unions").WithLocation(51, 21),
// (56,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is not ("11" and ['1', '1']);
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"not (""11"" and ['1', '1'])").WithArguments("unions").WithLocation(56, 21),
// (61,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is not null;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "not null").WithArguments("unions").WithLocation(61, 21),
// (66,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is not ({ } and int);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "not ({ } and int)").WithArguments("unions").WithLocation(66, 21)
);
}
[Fact]
public void UnionMatching_14_Negated_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default(S1)));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(Test2(null));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(default(S1)));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(Test3(null));
System.Console.Write(' ');
System.Console.Write(Test4(new S1(11)));
System.Console.Write(Test4(default(S1)));
System.Console.Write(Test4(new S1(""11"")));
System.Console.Write(Test4(null));
System.Console.Write(' ');
System.Console.Write(Test5(new S1(10)));
System.Console.Write(Test5(default(S1)));
System.Console.Write(Test5(new S1(""11"")));
System.Console.Write(Test5(new S1(0)));
System.Console.Write(Test5(null));
}
static bool Test1(S1? u)
{
return u is not 10;
}
static bool Test2(S1? u)
{
return u is not (10 or 11);
}
static bool Test3(S1? u)
{
return u is not (""11"" and ['1', '1']);
}
static bool Test4(S1? u)
{
return u is not null;
}
static bool Test5(S1? u)
{
return u is not ({ } and int);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "FalseTrueTrueTrueFalse FalseTrueTrueTrueFalseFalse TrueTrueFalseFalse TrueFalseTrueFalse FalseTrueTrueFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "FalseTrueTrueTrueFalse FalseTrueTrueTrueFalseFalse TrueTrueFalseFalse TrueFalseTrueFalse FalseTrueTrueFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (51,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is not 10;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "not 10").WithArguments("unions").WithLocation(51, 21),
// (56,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is not (10 or 11);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "not (10 or 11)").WithArguments("unions").WithLocation(56, 21),
// (61,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is not ("11" and ['1', '1']);
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"not (""11"" and ['1', '1'])").WithArguments("unions").WithLocation(61, 21),
// (66,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is not null;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "not null").WithArguments("unions").WithLocation(66, 21),
// (71,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is not ({ } and int);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "not ({ } and int)").WithArguments("unions").WithLocation(71, 21)
);
}
[Fact]
public void UnionMatching_15_Negated()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test5(new S1(11)));
System.Console.Write(Test5(default));
System.Console.Write(Test5(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test6(new S1(11)));
System.Console.Write(Test6(default));
System.Console.Write(Test6(new S1(""11"")));
}
static int Test5(S1 u)
{
if (u is not int x)
{
return -1;
}
return x;
}
static int Test6(S1 u)
{
if (u is not not not int x)
{
return -1;
}
return x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "11-1-1 11-1-1").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_16_Negated()
{
var src = @"
[System.Runtime.CompilerServices.Union]
sealed class C1
{
private readonly object _value;
public C1(int x) { _value = x; }
public C1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static int Test5(C1 u)
{
#line 14
if (u is not int x)
{
return -1;
}
#line 19
return x;
}
static int Test6(S1 u)
{
if (u is not not int y)
{
return y - 1;
}
#line 29
return y;
}
static int Test7(S1? u)
{
#line 34
if (u is not int z)
{
return -1;
}
#line 39
return z;
}
static bool Test8(S1 u)
{
#line 44
return u is not (S1 and int);
}
static bool Test9(S1? u)
{
#line 49
return u is not (S1 and int);
}
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
// There is an implicit null check for class union types and for Nullable<Union>.
comp.VerifyDiagnostics(
// (14,26): error CS8780: A variable may not be declared within a 'not' or 'or' pattern.
// if (u is not int x)
Diagnostic(ErrorCode.ERR_DesignatorBeneathPatternCombinator, "x").WithLocation(14, 26),
// (19,16): error CS0165: Use of unassigned local variable 'x'
// return x;
Diagnostic(ErrorCode.ERR_UseDefViolation, "x").WithArguments("x").WithLocation(19, 16),
// (29,16): error CS0165: Use of unassigned local variable 'y'
// return y;
Diagnostic(ErrorCode.ERR_UseDefViolation, "y").WithArguments("y").WithLocation(29, 16),
// (34,26): error CS8780: A variable may not be declared within a 'not' or 'or' pattern.
// if (u is not int z)
Diagnostic(ErrorCode.ERR_DesignatorBeneathPatternCombinator, "z").WithLocation(34, 26),
// (39,16): error CS0165: Use of unassigned local variable 'z'
// return z;
Diagnostic(ErrorCode.ERR_UseDefViolation, "z").WithArguments("z").WithLocation(39, 16),
// https://github.com/dotnet/roslyn/issues/82636: The following diagnostics is somewhat confusing in these cases.
// A type cannot be handled by the pattern of the same type.
// Syntactially it is not obvious that we are doing a union matching.
// (44,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'S1'.
// return u is not (S1 and int);
Diagnostic(ErrorCode.ERR_PatternWrongType, "S1").WithArguments("S1", "S1").WithLocation(44, 26),
// (49,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'S1'.
// return u is not (S1 and int);
Diagnostic(ErrorCode.ERR_PatternWrongType, "S1").WithArguments("S1", "S1").WithLocation(49, 26)
);
}
[Fact]
public void UnionMatching_17_Negated_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
class C1
{
private readonly object _value;
public C1() {}
public C1(int x) { _value = x; }
public C1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(11)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new C1(11)));
System.Console.Write(Test2(new C1()));
System.Console.Write(Test2(new C1(""11"")));
System.Console.Write(Test2(null));
}
static bool Test1(S1? u)
{
return u is not null;
}
static bool Test2(C1 u)
{
return u is not null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseTrueFalse TrueFalseTrueFalse").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 30 (0x1e)
.maxstack 2
.locals init (S1 V_0)
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1?.HasValue.get""
IL_0007: brfalse.s IL_001c
IL_0009: ldarga.s V_0
IL_000b: call ""S1 S1?.GetValueOrDefault()""
IL_0010: stloc.0
IL_0011: ldloca.s V_0
IL_0013: call ""object S1.Value.get""
IL_0018: ldnull
IL_0019: cgt.un
IL_001b: ret
IL_001c: ldc.i4.0
IL_001d: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 15 (0xf)
.maxstack 2
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000d
IL_0003: ldarg.0
IL_0004: callvirt ""object C1.Value.get""
IL_0009: ldnull
IL_000a: cgt.un
IL_000c: ret
IL_000d: ldc.i4.0
IL_000e: ret
}
");
}
[Fact]
public void UnionMatching_17_Negated_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
class C1
{
private readonly object _value;
public C1() {}
public C1(int x) { _value = x; }
public C1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(11)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new C1(11)));
System.Console.Write(Test2(new C1()));
System.Console.Write(Test2(new C1(""11"")));
System.Console.Write(Test2(null));
}
static bool Test1(S1? u)
{
return u is not (string)null;
}
static bool Test2(C1 u)
{
return u is not (string)null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseTrueFalse TrueFalseTrueFalse").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 30 (0x1e)
.maxstack 2
.locals init (S1 V_0)
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1?.HasValue.get""
IL_0007: brfalse.s IL_001c
IL_0009: ldarga.s V_0
IL_000b: call ""S1 S1?.GetValueOrDefault()""
IL_0010: stloc.0
IL_0011: ldloca.s V_0
IL_0013: call ""object S1.Value.get""
IL_0018: ldnull
IL_0019: cgt.un
IL_001b: ret
IL_001c: ldc.i4.0
IL_001d: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 15 (0xf)
.maxstack 2
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000d
IL_0003: ldarg.0
IL_0004: callvirt ""object C1.Value.get""
IL_0009: ldnull
IL_000a: cgt.un
IL_000c: ret
IL_000d: ldc.i4.0
IL_000e: ret
}
");
}
[Fact]
public void UnionMatching_17_Negated_03()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
class C1
{
private readonly object _value;
public C1() {}
public C1(int x) { _value = x; }
public C1(C2 x) { _value = x; }
public object Value => _value;
}
class C2;
class Program
{
static bool Test1(S1? u)
{
return u is not (string)null;
}
static bool Test2(C1 u)
{
return u is not (string)null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (27,25): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// return u is not (string)null;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "(string)null").WithArguments("S1").WithLocation(27, 25),
// (27,25): error CS0029: Cannot implicitly convert type 'string' to 'int'
// return u is not (string)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(string)null").WithArguments("string", "int").WithLocation(27, 25),
// (27,25): error CS0029: Cannot implicitly convert type 'string' to 'C2'
// return u is not (string)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(string)null").WithArguments("string", "C2").WithLocation(27, 25),
// (32,25): error CS9372: An expression of type 'C1' cannot be handled by this pattern, see additional errors at this location.
// return u is not (string)null;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "(string)null").WithArguments("C1").WithLocation(32, 25),
// (32,25): error CS0029: Cannot implicitly convert type 'string' to 'int'
// return u is not (string)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(string)null").WithArguments("string", "int").WithLocation(32, 25),
// (32,25): error CS0029: Cannot implicitly convert type 'string' to 'C2'
// return u is not (string)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(string)null").WithArguments("string", "C2").WithLocation(32, 25)
);
}
[Fact]
public void UnionMatching_17_BinaryOr()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(Test2(new S1(""111"")));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(10)));
System.Console.Write(Test3(default(S1)));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(Test3(new S1(0)));
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(new S1(""111"")));
System.Console.Write(Test3(null));
}
static bool Test2(S1 u)
{
return u is 10 or ""11"";
}
static bool Test3(S1? u)
{
return u is 10 or ""11"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseTrueFalseFalseFalse TrueFalseTrueFalseFalseFalseFalse").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "TrueFalseTrueFalseFalseFalse TrueFalseTrueFalseFalseFalseFalse").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (33,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is 10 or "11";
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(33, 21),
// (33,27): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is 10 or "11";
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"""11""").WithArguments("unions").WithLocation(33, 27),
// (38,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is 10 or "11";
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(38, 21),
// (38,27): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is 10 or "11";
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"""11""").WithArguments("unions").WithLocation(38, 27)
);
}
[Fact]
public void UnionMatching_18_BinaryAnd()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(null));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(""11"")));
}
static string Test2(object u)
{
if (u is S1 and int x)
{
return x.ToString();
}
return ""_"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "10___").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_19_BinaryAnd()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(10)));
System.Console.Write(Test3(default(S1)));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(Test3(null));
}
static string Test2(S1 u)
{
if (u is 10 and var x)
{
return x.GetType().ToString();
}
return ""_"";
}
static string Test3(S1? u)
{
if (u is 10 and var x)
{
return x.GetType().ToString();
}
return ""_"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "System.Int32__ System.Int32___").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "System.Int32__ System.Int32___").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (27,18): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// if (u is 10 and var x)
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(27, 18),
// (37,18): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// if (u is 10 and var x)
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(37, 18)
);
}
[Fact]
public void UnionMatching_20_BinaryAnd()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(S2 x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
private readonly object _value;
public S2(int x) { _value = x; }
public S2(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1(new S2(10))));
System.Console.Write(Test2(new S1(new S2(11))));
System.Console.Write(Test2(null));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(new S2())));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(new S2(""11""))));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(new S2(10))));
System.Console.Write(Test3(new S1(new S2(11))));
System.Console.Write(Test3(null));
System.Console.Write(Test3(new S1()));
System.Console.Write(Test3(new S1(new S2())));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(Test3(new S1(new S2(""11""))));
}
static bool Test2(object u)
{
return u is S1 and S2 and 10;
}
static bool Test3(object u)
{
return u is S1 and (S2 and 10);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalseFalseFalseFalse TrueFalseFalseFalseFalseFalseFalse").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_21_BinaryAnd()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(S2 x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
private readonly object _value;
public S2(S3 x) { _value = x; }
public S2(int x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
struct S3
{
private readonly object _value;
public S3(int x) { _value = x; }
public S3(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1(new S2(new S3(10)))));
System.Console.Write(Test2(new S1(new S2(new S3(11)))));
System.Console.Write(Test2(null));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(new S2())));
System.Console.Write(Test2(new S1(new S2(new S3()))));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(new S2(10))));
System.Console.Write(Test2(new S1(new S2(11))));
System.Console.Write(Test2(new S1(new S2(new S3(""11"")))));
System.Console.WriteLine();
System.Console.Write(Test3(new S1(new S2(new S3(10)))));
System.Console.Write(Test3(new S1(new S2(new S3(11)))));
System.Console.Write(Test3(null));
System.Console.Write(Test3(new S1()));
System.Console.Write(Test3(new S1(new S2())));
System.Console.Write(Test3(new S1(new S2(new S3()))));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(Test3(new S1(new S2(10))));
System.Console.Write(Test3(new S1(new S2(11))));
System.Console.Write(Test3(new S1(new S2(new S3(""11"")))));
System.Console.WriteLine();
System.Console.Write(Test4(new S1(new S2(new S3(10)))));
System.Console.Write(Test4(new S1(new S2(new S3(11)))));
System.Console.Write(Test4(null));
System.Console.Write(Test4(new S1()));
System.Console.Write(Test4(new S1(new S2())));
System.Console.Write(Test4(new S1(new S2(new S3()))));
System.Console.Write(Test4(new S1(""11"")));
System.Console.Write(Test4(new S1(new S2(10))));
System.Console.Write(Test4(new S1(new S2(11))));
System.Console.Write(Test4(new S1(new S2(new S3(""11"")))));
System.Console.WriteLine();
System.Console.Write(Test5(new S1(new S2(new S3(10)))));
System.Console.Write(Test5(new S1(new S2(new S3(11)))));
System.Console.Write(Test5(null));
System.Console.Write(Test5(new S1()));
System.Console.Write(Test5(new S1(new S2())));
System.Console.Write(Test5(new S1(new S2(new S3()))));
System.Console.Write(Test5(new S1(""11"")));
System.Console.Write(Test5(new S1(new S2(10))));
System.Console.Write(Test5(new S1(new S2(11))));
System.Console.Write(Test5(new S1(new S2(new S3(""11"")))));
System.Console.WriteLine();
System.Console.Write(Test6(new S1(new S2(new S3(10)))));
System.Console.Write(Test6(new S1(new S2(new S3(11)))));
System.Console.Write(Test6(null));
System.Console.Write(Test6(new S1()));
System.Console.Write(Test6(new S1(new S2())));
System.Console.Write(Test6(new S1(new S2(new S3()))));
System.Console.Write(Test6(new S1(""11"")));
System.Console.Write(Test6(new S1(new S2(10))));
System.Console.Write(Test6(new S1(new S2(11))));
System.Console.Write(Test6(new S1(new S2(new S3(""11"")))));
}
static bool Test2(object u)
{
return u is ((S1 and S2) and S3) and 10;
}
static bool Test3(object u)
{
return u is (S1 and S2) and (S3 and 10);
}
static bool Test4(object u)
{
return u is (S1 and (S2 and S3)) and 10;
}
static bool Test5(object u)
{
return u is S1 and (S2 and S3 and 10);
}
static bool Test6(object u)
{
return u is S1 and (S2 and (S3 and 10));
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: @"
TrueFalseFalseFalseFalseFalseFalseFalseFalseFalse
TrueFalseFalseFalseFalseFalseFalseFalseFalseFalse
TrueFalseFalseFalseFalseFalseFalseFalseFalseFalse
TrueFalseFalseFalseFalseFalseFalseFalseFalseFalse
TrueFalseFalseFalseFalseFalseFalseFalseFalseFalse
").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_22_BinaryAnd()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(S2 x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
private readonly object _value;
public S2(S3 x) { _value = x; }
public S2(int x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
struct S3
{
private readonly object _value;
public S3(int x) { _value = x; }
public S3(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1(new S2(new S3(10)))));
System.Console.Write(Test2(new S1(new S2(new S3(11)))));
System.Console.Write(Test2(null));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(new S2())));
System.Console.Write(Test2(new S1(new S2(new S3()))));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(new S2(10))));
System.Console.Write(Test2(new S1(new S2(11))));
System.Console.Write(Test2(new S1(new S2(new S3(""11"")))));
System.Console.WriteLine();
System.Console.Write(Test3(new S1(new S2(new S3(10)))));
System.Console.Write(Test3(new S1(new S2(new S3(11)))));
System.Console.Write(Test3(null));
System.Console.Write(Test3(new S1()));
System.Console.Write(Test3(new S1(new S2())));
System.Console.Write(Test3(new S1(new S2(new S3()))));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(Test3(new S1(new S2(10))));
System.Console.Write(Test3(new S1(new S2(11))));
System.Console.Write(Test3(new S1(new S2(new S3(""11"")))));
System.Console.WriteLine();
System.Console.Write(Test4(new S1(new S2(new S3(10)))));
System.Console.Write(Test4(new S1(new S2(new S3(11)))));
System.Console.Write(Test4(null));
System.Console.Write(Test4(new S1()));
System.Console.Write(Test4(new S1(new S2())));
System.Console.Write(Test4(new S1(new S2(new S3()))));
System.Console.Write(Test4(new S1(""11"")));
System.Console.Write(Test4(new S1(new S2(10))));
System.Console.Write(Test4(new S1(new S2(11))));
System.Console.Write(Test4(new S1(new S2(new S3(""11"")))));
System.Console.WriteLine();
System.Console.Write(Test5(new S1(new S2(new S3(10)))));
System.Console.Write(Test5(new S1(new S2(new S3(11)))));
System.Console.Write(Test5(null));
System.Console.Write(Test5(new S1()));
System.Console.Write(Test5(new S1(new S2())));
System.Console.Write(Test5(new S1(new S2(new S3()))));
System.Console.Write(Test5(new S1(""11"")));
System.Console.Write(Test5(new S1(new S2(10))));
System.Console.Write(Test5(new S1(new S2(11))));
System.Console.Write(Test5(new S1(new S2(new S3(""11"")))));
System.Console.WriteLine();
System.Console.Write(Test6(new S1(new S2(new S3(10)))));
System.Console.Write(Test6(new S1(new S2(new S3(11)))));
System.Console.Write(Test6(null));
System.Console.Write(Test6(new S1()));
System.Console.Write(Test6(new S1(new S2())));
System.Console.Write(Test6(new S1(new S2(new S3()))));
System.Console.Write(Test6(new S1(""11"")));
System.Console.Write(Test6(new S1(new S2(10))));
System.Console.Write(Test6(new S1(new S2(11))));
System.Console.Write(Test6(new S1(new S2(new S3(""11"")))));
}
static bool Test2(object u)
{
return u is ((S1 and S2) and S3) and var x and 10;
}
static bool Test3(object u)
{
return u is (S1 and S2) and (var x and S3 and 10);
}
static bool Test4(object u)
{
return u is (S1 and (var x and S2 and S3)) and 10;
}
static bool Test5(object u)
{
return u is S1 and (S2 and var x and S3 and 10);
}
static bool Test6(object u)
{
return u is S1 and (S2 and (var x and S3 and 10));
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: @"
TrueFalseFalseFalseFalseFalseFalseFalseFalseFalse
TrueFalseFalseFalseFalseFalseFalseFalseFalseFalse
TrueFalseFalseFalseFalseFalseFalseFalseFalseFalse
TrueFalseFalseFalseFalseFalseFalseFalseFalseFalse
TrueFalseFalseFalseFalseFalseFalseFalseFalseFalse
").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_23_Parenthesized_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(default));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test4(new S1(11)));
System.Console.Write(Test4(default));
System.Console.Write(Test4(new S1(""11"")));
}
static bool Test1(S1 u)
{
return u is (10);
}
static bool Test2(S1 u)
{
return u is (10 or 11);
}
static bool Test3(S1 u)
{
return u is (""11"" and ['1', '1']);
}
static bool Test4(S1 u)
{
return u is (null);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseFalseTrue FalseFalseTrue FalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseFalseTrue FalseFalseTrue FalseTrueFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (40,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (10);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "(10)").WithArguments("unions").WithLocation(40, 21),
// (45,22): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (10 or 11);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(45, 22),
// (45,28): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (10 or 11);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "11").WithArguments("unions").WithLocation(45, 28),
// (50,22): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is ("11" and ['1', '1']);
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"""11""").WithArguments("unions").WithLocation(50, 22),
// (55,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (null);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "(null)").WithArguments("unions").WithLocation(55, 21)
);
}
[Fact]
public void UnionMatching_23_Parenthesized_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default(S1)));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(Test2(null));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(default(S1)));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(Test3(null));
System.Console.Write(' ');
System.Console.Write(Test4(new S1(11)));
System.Console.Write(Test4(default(S1)));
System.Console.Write(Test4(new S1(""11"")));
System.Console.Write(Test4(null));
}
static bool Test1(S1? u)
{
return u is (10);
}
static bool Test2(S1? u)
{
return u is (10 or 11);
}
static bool Test3(S1? u)
{
return u is (""11"" and ['1', '1']);
}
static bool Test4(S1? u)
{
return u is (null);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalseFalse TrueFalseFalseFalseTrueFalse FalseFalseTrueFalse FalseTrueFalseTrue" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalseFalse TrueFalseFalseFalseTrueFalse FalseFalseTrueFalse FalseTrueFalseTrue" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (44,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (10);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "(10)").WithArguments("unions").WithLocation(44, 21),
// (49,22): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (10 or 11);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(49, 22),
// (49,28): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (10 or 11);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "11").WithArguments("unions").WithLocation(49, 28),
// (54,22): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is ("11" and ['1', '1']);
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"""11""").WithArguments("unions").WithLocation(54, 22),
// (59,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (null);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "(null)").WithArguments("unions").WithLocation(59, 21)
);
}
[Fact]
public void UnionMatching_24_Relational_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(new S1(11)));
}
static bool Test1(S1 u)
{
return u is >=10;
}
static bool Test2(S1 u)
{
return u is <10 or 11;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalse FalseFalseFalseTrueTrue").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalse FalseFalseFalseTrueTrue").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (30,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is >=10;
Diagnostic(ErrorCode.ERR_FeatureInPreview, ">=10").WithArguments("unions").WithLocation(30, 21),
// (35,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is <10 or 11;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "<10").WithArguments("unions").WithLocation(35, 21),
// (35,28): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is <10 or 11;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "11").WithArguments("unions").WithLocation(35, 28)
);
}
[Fact]
public void UnionMatching_24_Relational_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default(S1)));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(Test2(null));
}
static bool Test1(S1? u)
{
return u is >=10;
}
static bool Test2(S1? u)
{
return u is <10 or 11;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalseFalse FalseFalseFalseTrueTrueFalse").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalseFalse FalseFalseFalseTrueTrueFalse").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (32,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is >=10;
Diagnostic(ErrorCode.ERR_FeatureInPreview, ">=10").WithArguments("unions").WithLocation(32, 21),
// (37,21): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is <10 or 11;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "<10").WithArguments("unions").WithLocation(37, 21),
// (37,28): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is <10 or 11;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "11").WithArguments("unions").WithLocation(37, 28)
);
}
[Fact]
public void UnionMatching_25_List()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int[] x) { _value = x; }
public S1(string[] x) { _value = x; }
public object Value => _value;
}
class Program
{
static bool Test1(S1 u)
{
#line 14
return u is [10];
}
static bool Test2(S1? u)
{
#line 19
return u is [10];
}
}
static class Extensions
{
extension(object o)
{
public int Length => 0;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (14,21): error CS8985: List patterns may not be used for a value of type 'object'. No suitable 'Length' or 'Count' property was found.
// return u is [10];
Diagnostic(ErrorCode.ERR_ListPatternRequiresLength, "[10]").WithArguments("object").WithLocation(14, 21),
// (14,21): error CS0021: Cannot apply indexing with [] to an expression of type 'object'
// return u is [10];
Diagnostic(ErrorCode.ERR_BadIndexLHS, "[10]").WithArguments("object").WithLocation(14, 21),
// (19,21): error CS8985: List patterns may not be used for a value of type 'object'. No suitable 'Length' or 'Count' property was found.
// return u is [10];
Diagnostic(ErrorCode.ERR_ListPatternRequiresLength, "[10]").WithArguments("object").WithLocation(19, 21),
// (19,21): error CS0021: Cannot apply indexing with [] to an expression of type 'object'
// return u is [10];
Diagnostic(ErrorCode.ERR_BadIndexLHS, "[10]").WithArguments("object").WithLocation(19, 21)
);
}
[Fact]
public void UnionMatching_26_List_Subpattern_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
struct S2
{
private S1 _value;
public S2(S1 x) {_value = x;}
public int Length => 2;
public S1 this[int i] => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S2(new S1(10))));
System.Console.Write(Test1(new S2(default)));
System.Console.Write(Test1(new S2(new S1(""11""))));
System.Console.Write(Test1(new S2(new S1(0))));
}
static bool Test1(S2 u)
{
return u is [10, _];
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (31,22): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is [10, _];
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(31, 22)
);
}
[Fact]
public void UnionMatching_26_List_Subpattern_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
struct S2
{
private S1? _value;
public S2(S1? x) {_value = x;}
public int Length => 2;
public S1? this[int i] => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S2(new S1(10))));
System.Console.Write(Test1(new S2(default(S1))));
System.Console.Write(Test1(new S2(new S1(""11""))));
System.Console.Write(Test1(new S2(new S1(0))));
System.Console.Write(Test1(new S2(null)));
}
static bool Test1(S2 u)
{
return u is [10, _];
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
}
[Fact]
public void UnionMatching_27_Slice_Subpattern_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
struct S2
{
private S1 _value;
public S2(S1 x) {_value = x;}
public int Length => 2;
public int this[int i] => 0;
public S1 this[System.Range r] => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S2(new S1(10))));
System.Console.Write(Test1(new S2(default)));
System.Console.Write(Test1(new S2(new S1(""11""))));
System.Console.Write(Test1(new S2(new S1(0))));
}
static bool Test1(S2 u)
{
return u is [0, ..10];
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (32,27): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is [0, ..10];
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(32, 27)
);
}
[Fact]
public void UnionMatching_27_Slice_Subpattern_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
struct S2
{
private S1? _value;
public S2(S1? x) {_value = x;}
public int Length => 2;
public int this[int i] => 0;
public S1? this[System.Range r] => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S2(new S1(10))));
System.Console.Write(Test1(new S2(default(S1))));
System.Console.Write(Test1(new S2(new S1(""11""))));
System.Console.Write(Test1(new S2(new S1(0))));
System.Console.Write(Test1(new S2(null)));
}
static bool Test1(S2 u)
{
return u is [0, ..10];
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
}
[Fact]
public void UnionMatching_28_Tuple_Deconstruction_Subpattern()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1((new S1(10), -1)));
System.Console.Write(Test1((default, -1)));
System.Console.Write(Test1((new S1(""11""), -1)));
System.Console.Write(Test1((new S1(0), -1)));
System.Console.Write(' ');
System.Console.Write(Test2((new S1(10), -1)));
System.Console.Write(Test2((default(S1), -1)));
System.Console.Write(Test2((new S1(""11""), -1)));
System.Console.Write(Test2((new S1(0), -1)));
System.Console.Write(Test2((null, -1)));
}
static bool Test1((S1, int) u)
{
return u is (10, _);
}
static bool Test2((S1?, int) u)
{
return u is (10, _);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse TrueFalseFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (29,22): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (10, _);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(29, 22),
// (34,22): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (10, _);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(34, 22)
);
}
[Fact]
public void UnionMatching_29_ITuple_Deconstruction_Subpattern()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new C(new S1(10))));
System.Console.Write(Test1(new C(default)));
System.Console.Write(Test1(new C(new S1(11))));
System.Console.Write(Test1(new C(new S1(""10""))));
}
static bool Test1(C u)
{
return u is (S1 and 10, _);
}
}
class C : System.Runtime.CompilerServices.ITuple
{
private readonly S1 _value;
public C(S1 x) { _value = x; }
int System.Runtime.CompilerServices.ITuple.Length => 2;
object System.Runtime.CompilerServices.ITuple.this[int i] => _value;
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TrueFalseFalseFalse" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (23,29): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (S1 and 10, _);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(23, 29)
);
}
[Fact]
public void UnionMatching_30_Deconstruction_Subpattern_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new C(new S1(10))));
System.Console.Write(Test1(new C(default)));
System.Console.Write(Test1(new C(new S1(11))));
System.Console.Write(Test1(new C(new S1(""10""))));
}
static bool Test1(C u)
{
return u is (10, _);
}
}
class C
{
private readonly S1 _value;
public C(S1 x) { _value = x; }
public void Deconstruct(out S1 a, out int b) { a = _value; b = -1; }
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalse").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalse").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (23,22): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is (10, _);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(23, 22)
);
}
[Fact]
public void UnionMatching_30_Deconstruction_Subpattern_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new C(new S1(10))));
System.Console.Write(Test1(new C(default(S1))));
System.Console.Write(Test1(new C(new S1(11))));
System.Console.Write(Test1(new C(new S1(""10""))));
System.Console.Write(Test1(new C(null)));
}
static bool Test1(C u)
{
return u is (10, _);
}
}
class C
{
private readonly S1? _value;
public C(S1? x) { _value = x; }
public void Deconstruct(out S1? a, out int b) { a = _value; b = -1; }
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalseFalse").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_31_Property_Subpattern_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new C(new S1(10))));
System.Console.Write(Test1(new C(default)));
System.Console.Write(Test1(new C(new S1(11))));
System.Console.Write(Test1(new C(new S1(""10""))));
}
static bool Test1(C u)
{
return u is { P: 10 };
}
}
class C
{
private readonly S1 _value;
public C(S1 x) { _value = x; }
public S1 P => _value;
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalse").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalse").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (23,26): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is { P: 10 };
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(23, 26)
);
}
[Fact]
public void UnionMatching_31_Property_Subpattern_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new C(new S1(10))));
System.Console.Write(Test1(new C(default(S1))));
System.Console.Write(Test1(new C(new S1(11))));
System.Console.Write(Test1(new C(new S1(""10""))));
System.Console.Write(Test1(new C(null)));
}
static bool Test1(C u)
{
return u is { P: 10 };
}
}
class C
{
private readonly S1? _value;
public C(S1? x) { _value = x; }
public S1? P => _value;
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalseFalse").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_32_Negated_Subpattern()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test1(new S1(11)));
System.Console.Write(Test1(new S1(""10"")));
System.Console.Write(Test1(null));
}
static bool Test1(object u)
{
return u is not (S1 and 10);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "FalseTrueTrueTrueTrue").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "FalseTrueTrueTrueTrue").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (24,33): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return u is not (S1 and 10);
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(24, 33)
);
}
[Fact]
public void UnionMatching_33_SwitchLabel_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default));
System.Console.Write(Test2(new S1(""10"")));
System.Console.Write(Test2(new S1(0)));
}
static bool Test1(S1 u)
{
switch (u)
{
case int: return true;
default: return false;
}
}
static bool Test2(S1 u)
{
switch (u)
{
case 10: return true;
default: return false;
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseTrue TrueFalseFalseFalse").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_33_SwitchLabel_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(default(S1)));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1(""10"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(null));
}
static bool Test1(S1? u)
{
switch (u)
{
case int: return true;
default: return false;
}
}
static bool Test2(S1? u)
{
switch (u)
{
case 10: return true;
default: return false;
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseTrueFalse TrueFalseFalseFalseFalse").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_34_BinaryAnd()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S0
{
private readonly object _value;
public S0(S1 x) { _value = x; }
public S0(string x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(S2 x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
private readonly object _value;
public S2(int x) { _value = x; }
public S2(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S0(new S1(new S2(10)))));
System.Console.Write(Test2(new S0(new S1(new S2(11)))));
System.Console.Write(Test2(new S0(null)));
System.Console.Write(Test2(new S0(new S1())));
System.Console.Write(Test2(new S0(new S1(new S2()))));
System.Console.Write(Test2(new S0(new S1(""11""))));
System.Console.Write(Test2(new S0(new S1(new S2(""11"")))));
System.Console.Write(' ');
System.Console.Write(Test3(new S0(new S1(new S2(10)))));
System.Console.Write(Test3(new S0(new S1(new S2(11)))));
System.Console.Write(Test3(new S0(null)));
System.Console.Write(Test3(new S0(new S1())));
System.Console.Write(Test3(new S0(new S1(new S2()))));
System.Console.Write(Test3(new S0(new S1(""11""))));
System.Console.Write(Test3(new S0(new S1(new S2(""11"")))));
}
static bool Test2(S0 u)
{
return u is S1 and S2 and 10;
}
static bool Test3(S0 u)
{
return u is S1 and (S2 and 10);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalseFalseFalseFalse TrueFalseFalseFalseFalseFalseFalse").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_35_TypeParameter()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class C1
{
private readonly object _value;
public C1(int x) { _value = x; }
public C1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new C1(1)));
System.Console.Write(Test2(new C1(""2"")));
System.Console.Write(Test3(new C1(3)));
System.Console.Write(Test4(new C1(4)));
}
static bool Test1<T>(T u) where T : C1
{
return u is int;
}
static bool Test2<T>(T u) where T : C1
{
return u is string;
}
static bool Test3<T>(T u) where T : C1
{
return u is long;
}
static bool Test4<T>(T u) where T : C1
{
return u is C1;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "FalseFalseFalseTrue").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1<T>(T)", @"
{
// Code size 15 (0xf)
.maxstack 2
IL_0000: ldarg.0
IL_0001: box ""T""
IL_0006: isinst ""int""
IL_000b: ldnull
IL_000c: cgt.un
IL_000e: ret
}
");
verifier.VerifyIL("Program.Test2<T>(T)", @"
{
// Code size 15 (0xf)
.maxstack 2
IL_0000: ldarg.0
IL_0001: box ""T""
IL_0006: isinst ""string""
IL_000b: ldnull
IL_000c: cgt.un
IL_000e: ret
}
");
verifier.VerifyIL("Program.Test3<T>(T)", @"
{
// Code size 15 (0xf)
.maxstack 2
IL_0000: ldarg.0
IL_0001: box ""T""
IL_0006: isinst ""long""
IL_000b: ldnull
IL_000c: cgt.un
IL_000e: ret
}
");
verifier.VerifyIL("Program.Test4<T>(T)", @"
{
// Code size 10 (0xa)
.maxstack 2
IL_0000: ldarg.0
IL_0001: box ""T""
IL_0006: ldnull
IL_0007: cgt.un
IL_0009: ret
}
");
}
[Fact]
public void UnionMatching_36_SwitchStatement()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(new S1(""10"")));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(11)));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(new S1(""10"")));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(null));
}
static int Test1(S1 u)
{
switch (u)
{
case 10: return 1;
case ""11"": return 2;
}
return -1;
}
static int Test2(S1? u)
{
switch (u)
{
case 10: return 1;
case ""11"": return 2;
}
return -1;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "1-1-1-12-1 1-1-1-12-1-1").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "1-1-1-12-1 1-1-1-12-1-1").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (35,18): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// case 10: return 1;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(35, 18),
// (36,18): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// case "11": return 2;
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"""11""").WithArguments("unions").WithLocation(36, 18),
// (46,18): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// case 10: return 1;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(46, 18),
// (47,18): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// case "11": return 2;
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"""11""").WithArguments("unions").WithLocation(47, 18)
);
}
[Fact]
public void UnionMatching_37_SwitchStatement_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(Test1(new S1(""10"")));
System.Console.Write(Test1(default));
System.Console.Write(Test1(new S1(11)));
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(new S1(""10"")));
System.Console.Write(Test2(default(S1)));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(null));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(10)));
System.Console.Write(Test3(new S1(""10"")));
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(Test3(new S1(0)));
}
static int Test1(S1 u)
{
switch (u)
{
case null: return 66;
case 10: goto case 44;
case ""11"": goto case ""55"";
case 44: return 44;
case ""55"": return 55;
case 11: goto case null;
}
return -1;
}
static int Test2(S1? u)
{
switch (u)
{
case null: return 66;
case 10: goto case 44;
case ""11"": goto case ""55"";
case 44: return 44;
case ""55"": return 55;
}
return -1;
}
static int Test3(S1? u)
{
switch (u)
{
case null: return 66;
case 10: goto case null;
case ""11"": goto case ""55"";
case ""55"": return 55;
}
return -1;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "44-1666655-1 44-166-155-166 66-1-155-1").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_37_SwitchStatement_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(new S1(""10"")));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(null));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(10)));
System.Console.Write(Test3(new S1(""10"")));
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(Test3(new S1(0)));
}
static int Test2(S1 u)
{
switch (u)
{
case null: return 66;
case 10: goto case 44;
case ""11"": goto case ""55"";
case 44: return 44;
case ""55"": return 55;
}
return -1;
}
static int Test3(S1 u)
{
switch (u)
{
case null: return 66;
case 10: goto case null;
case ""11"": goto case ""55"";
case ""55"": return 55;
}
return -1;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "44-1-155-166 66-1-155-1").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_37_SwitchStatement_03()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(S1 x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1(10)));
System.Console.Write(Test2(new S1(""10"")));
System.Console.Write(Test2(new S1(11)));
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(Test2(new S1(0)));
System.Console.Write(Test2(null));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(10)));
System.Console.Write(Test3(new S1(""10"")));
System.Console.Write(Test3(new S1(11)));
System.Console.Write(Test3(new S1(""11"")));
System.Console.Write(Test3(new S1(0)));
}
const S1 _S1_null = null;
static int Test2(S1 u)
{
switch (u)
{
case _S1_null: return 66;
case 10: goto case 44;
case ""11"": goto case ""55"";
case 44: return 44;
case ""55"": return 55;
}
return -1;
}
static int Test3(S1 u)
{
switch (u)
{
case _S1_null: return 66;
case 10: goto case _S1_null;
case ""11"": goto case ""55"";
case ""55"": return 55;
}
return -1;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "44-1-155-166 66-1-155-1").VerifyDiagnostics();
}
[Fact]
public void UnionMatching_38_SwitchStatement()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static int Test1(S1 u)
{
switch (u)
{
case 10: return 1;
case ""11"": return 2;
#line 18
case true: return 3;
}
return -1;
}
static int Test2(S1? u)
{
switch (u)
{
case 10: return 1;
case ""11"": return 2;
#line 30
case true: return 3;
}
return -1;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (18,18): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// case true: return 3;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "true").WithArguments("S1").WithLocation(18, 18),
// (18,18): error CS0029: Cannot implicitly convert type 'bool' to 'int'
// case true: return 3;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "true").WithArguments("bool", "int").WithLocation(18, 18),
// (18,18): error CS0029: Cannot implicitly convert type 'bool' to 'string'
// case true: return 3;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "true").WithArguments("bool", "string").WithLocation(18, 18),
// (30,18): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// case true: return 3;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "true").WithArguments("S1").WithLocation(30, 18),
// (30,18): error CS0029: Cannot implicitly convert type 'bool' to 'int'
// case true: return 3;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "true").WithArguments("bool", "int").WithLocation(30, 18),
// (30,18): error CS0029: Cannot implicitly convert type 'bool' to 'string'
// case true: return 3;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "true").WithArguments("bool", "string").WithLocation(30, 18)
);
}
[Fact]
public void UnionMatching_39_SwitchStatement()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static int Test1(S1 u)
{
switch (u)
{
#line 16
case 10: goto case true;
case ""11"": return 2;
}
return -1;
}
static int Test2(S1? u)
{
switch (u)
{
#line 27
case 10: goto case true;
case ""11"": return 2;
}
return -1;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (16,13): error CS0163: Control cannot fall through from one case label ('case 10:') to another
// case 10: goto case true;
Diagnostic(ErrorCode.ERR_SwitchFallThrough, "case 10:").WithArguments("case 10:").WithLocation(16, 13),
// (16,22): error CS0029: Cannot implicitly convert type 'bool' to 'S1'
// case 10: goto case true;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "goto case true;").WithArguments("bool", "S1").WithLocation(16, 22),
// (27,13): error CS0163: Control cannot fall through from one case label ('case 10:') to another
// case 10: goto case true;
Diagnostic(ErrorCode.ERR_SwitchFallThrough, "case 10:").WithArguments("case 10:").WithLocation(27, 13),
// (27,22): error CS0029: Cannot implicitly convert type 'bool' to 'S1?'
// case 10: goto case true;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "goto case true;").WithArguments("bool", "S1?").WithLocation(27, 22)
);
}
[Fact]
public void PatternWrongType_TypePattern_01_BindConstantPatternWithFallbackToTypePattern_UnionType_Out_UnionType_In()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test1(S1 u)
{
#line 100
_ = u is C1 and C2;
_ = u is C1 and C3;
_ = u is C1 and C4;
_ = u switch { C4 => 1, _ => 0 };
}
static void Test2(S1? u)
{
#line 200
_ = u is C1 and C2;
_ = u is C1 and C3;
_ = u is C1 and C4;
_ = u switch { C4 => 1, _ => 0 };
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,25): hidden CS9335: The pattern is redundant.
// _ = u is C1 and C2;
Diagnostic(ErrorCode.HDN_RedundantPattern, "C2").WithLocation(100, 25),
// (101,25): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 and C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(101, 25),
// (102,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(102, 25),
// (103,24): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u switch { C4 => 1, _ => 0 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(103, 24),
// (200,25): hidden CS9335: The pattern is redundant.
// _ = u is C1 and C2;
Diagnostic(ErrorCode.HDN_RedundantPattern, "C2").WithLocation(200, 25),
// (201,25): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 and C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(201, 25),
// (202,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(202, 25),
// (203,24): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u switch { C4 => 1, _ => 0 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(203, 24)
);
}
[Fact]
public void PatternWrongType_TypePattern_02_BindTypePattern_UnionType_Out_UnionType_In()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test4(S1 u)
{
#line 400
_ = u is System.IComparable and string;
_ = u is string and int;
_ = u is object and byte;
_ = u switch { byte => 1, _ => 0 };
}
static void Test5(S1? u)
{
#line 500
_ = u is System.IComparable and string;
_ = u is string and int;
_ = u is object and byte;
_ = u switch { byte => 1, _ => 0 };
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (401,29): error CS8121: An expression of type 'string' cannot be handled by a pattern of type 'int'.
// _ = u is string and int;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("string", "int").WithLocation(401, 29),
// (402,29): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'byte'.
// _ = u is object and byte;
Diagnostic(ErrorCode.ERR_PatternWrongType, "byte").WithArguments("S1", "byte").WithLocation(402, 29),
// (403,24): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'byte'.
// _ = u switch { byte => 1, _ => 0 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "byte").WithArguments("S1", "byte").WithLocation(403, 24),
// (501,29): error CS8121: An expression of type 'string' cannot be handled by a pattern of type 'int'.
// _ = u is string and int;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("string", "int").WithLocation(501, 29),
// (502,29): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'byte'.
// _ = u is object and byte;
Diagnostic(ErrorCode.ERR_PatternWrongType, "byte").WithArguments("S1", "byte").WithLocation(502, 29),
// (503,24): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'byte'.
// _ = u switch { byte => 1, _ => 0 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "byte").WithArguments("S1", "byte").WithLocation(503, 24)
);
}
[Fact]
public void PatternWrongType_TypePattern_03()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test4(S1 u)
{
#line 400
switch (u)
{
case string:
break;
case byte:
break;
}
}
static void Test5(S1? u)
{
#line 500
switch (u)
{
case string:
break;
case byte:
break;
}
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (404,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'byte'.
// case byte:
Diagnostic(ErrorCode.ERR_PatternWrongType, "byte").WithArguments("S1", "byte").WithLocation(404, 18),
// (504,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'byte'.
// case byte:
Diagnostic(ErrorCode.ERR_PatternWrongType, "byte").WithArguments("S1", "byte").WithLocation(504, 18)
);
}
[Fact]
public void PatternWrongType_TypePattern_04_BindIsOperator()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
}
";
var src2 = @"
class Program
{
static void Test4(S1 u)
{
_ = u is System.IComparable;
_ = u is int;
_ = u is string;
_ = u is object;
#line 400
_ = u is long;
}
static void Test5(S1? u)
{
_ = u is System.IComparable;
_ = u is int;
_ = u is string;
_ = u is object;
#line 500
_ = u is long;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (400,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'long'.
// _ = u is long;
Diagnostic(ErrorCode.ERR_PatternWrongType, "long").WithArguments("S1", "long").WithLocation(400, 18),
// (500,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'long'.
// _ = u is long;
Diagnostic(ErrorCode.ERR_PatternWrongType, "long").WithArguments("S1", "long").WithLocation(500, 18)
);
}
[Fact]
public void PatternWrongType_RecursivePattern_01_BindRecursivePattern_UnionType_In()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test2(S1 u)
{
#line 200
_ = u is C1 and C2 {};
_ = u is C1 and C3 {};
_ = u is C1 and C4 {};
_ = u is C4 {};
}
static void Test3(S1? u)
{
#line 300
_ = u is C1 and C2 {};
_ = u is C1 and C3 {};
_ = u is C1 and C4 {};
_ = u is C4 {};
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (200,25): hidden CS9335: The pattern is redundant.
// _ = u is C1 and C2 {};
Diagnostic(ErrorCode.HDN_RedundantPattern, "C2 {}").WithLocation(200, 25),
// (201,25): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 and C3 {};
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(201, 25),
// (202,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 and C4 {};
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(202, 25),
// (203,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C4 {};
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(203, 18),
// (300,25): hidden CS9335: The pattern is redundant.
// _ = u is C1 and C2 {};
Diagnostic(ErrorCode.HDN_RedundantPattern, "C2 {}").WithLocation(300, 25),
// (301,25): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 and C3 {};
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(301, 25),
// (302,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 and C4 {};
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(302, 25),
// (303,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C4 {};
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(303, 18)
);
}
[Fact]
public void PatternWrongType_RecursivePattern_02_BindRecursivePattern_UnionType_Out()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test10(S1 u)
{
#line 1000
_ = u is C1 {} and C2;
_ = u is C1 {} and C3;
_ = u is C1 {} and C4;
}
static void Test20(S1? u)
{
#line 2000
_ = u is C1 {} and C2;
_ = u is C1 {} and C3;
_ = u is C1 {} and C4;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (1000,28): hidden CS9335: The pattern is redundant.
// _ = u is C1 {} and C2;
Diagnostic(ErrorCode.HDN_RedundantPattern, "C2").WithLocation(1000, 28),
// (1001,28): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 {} and C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(1001, 28),
// (1002,28): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 {} and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(1002, 28),
// (2000,28): hidden CS9335: The pattern is redundant.
// _ = u is C1 {} and C2;
Diagnostic(ErrorCode.HDN_RedundantPattern, "C2").WithLocation(2000, 28),
// (2001,28): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 {} and C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(2001, 28),
// (2002,28): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 {} and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(2002, 28)
);
}
[Fact]
public void PatternWrongType_DeclarationPattern_01_BindDeclarationPattern_UnionType_In()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test3(S1 u)
{
#line 300
_ = u is C1 and C2 a;
_ = u is C1 and C3 b;
_ = u is C1 and C4 c;
_ = u is C4 d;
}
static void Test4(S1? u)
{
#line 400
_ = u is C1 and C2 a;
_ = u is C1 and C3 b;
_ = u is C1 and C4 c;
_ = u is C4 d;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (301,25): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 and C3 b;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(301, 25),
// (302,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 and C4 c;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(302, 25),
// (303,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C4 d;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(303, 18),
// (401,25): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 and C3 b;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(401, 25),
// (402,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 and C4 c;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(402, 25),
// (403,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C4 d;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(403, 18)
);
}
[Fact]
public void PatternWrongType_DeclarationPattern_02_BindDeclarationPattern_UnionType_Out()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test9(S1 u)
{
#line 900
_ = u is C1 a and C2;
_ = u is C1 b and C3;
_ = u is C1 c and C4;
}
static void Test10(S1? u)
{
#line 950
_ = u is C1 a and C2;
_ = u is C1 b and C3;
_ = u is C1 c and C4;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (900,27): hidden CS9335: The pattern is redundant.
// _ = u is C1 a and C2;
Diagnostic(ErrorCode.HDN_RedundantPattern, "C2").WithLocation(900, 27),
// (901,27): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 b and C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(901, 27),
// (902,27): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 c and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(902, 27),
// (950,27): hidden CS9335: The pattern is redundant.
// _ = u is C1 a and C2;
Diagnostic(ErrorCode.HDN_RedundantPattern, "C2").WithLocation(950, 27),
// (951,27): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 b and C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(951, 27),
// (952,27): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 c and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(952, 27)
);
}
[Fact]
public void PatternWrongType_NegatedPattern_01_BindUnaryPattern_UnionType_Out()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test5(S1 u)
{
#line 500
_ = u is not C5 and C2;
_ = u is not C5 and C4;
}
static void Test6(S1? u)
{
#line 600
_ = u is not C5 and C2;
_ = u is not C5 and C4;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (501,29): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is not C5 and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(501, 29),
// (601,29): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is not C5 and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(601, 29)
);
}
[Fact]
public void PatternWrongType_NegatedPattern_02_BindUnaryPattern_UnionType_In()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test7(S1 u)
{
#line 700
_ = u is C1 and not C5;
_ = u is C1 and not C3;
_ = u is C1 and not C4;
_ = u is not C4;
}
static void Test8(S1? u)
{
#line 800
_ = u is C1 and not C5;
_ = u is C1 and not C3;
_ = u is C1 and not C4;
_ = u is not C4;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (701,29): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 and not C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(701, 29),
// (702,29): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 and not C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(702, 29),
// (703,22): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is not C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(703, 22),
// (801,29): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 and not C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(801, 29),
// (802,29): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 and not C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(802, 29),
// (803,22): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is not C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(803, 22)
);
}
[Fact]
public void PatternWrongType_ParenthesizedPattern_01_BindParenthesizedPattern_UnionType_Out()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test6(S1 u)
{
#line 600
_ = u is (not C5) and C2;
_ = u is (not C5) and C4;
}
static void Test7(S1? u)
{
#line 700
_ = u is (not C5) and C2;
_ = u is (not C5) and C4;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (601,31): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is (not C5) and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(601, 31),
// (701,31): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is (not C5) and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(701, 31)
);
}
[Fact]
public void PatternWrongType_ParenthesizedPattern_01_BindParenthesizedPattern_UnionType_In()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test8(S1 u)
{
#line 800
_ = u is C1 and (not C2);
_ = u is C1 and (not C3);
_ = u is C1 and (not C4);
_ = u is (not C4);
}
static void Test9(S1? u)
{
#line 900
_ = u is C1 and (not C2);
_ = u is C1 and (not C3);
_ = u is C1 and (not C4);
_ = u is (not C4);
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (801,30): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 and (not C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(801, 30),
// (802,30): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 and (not C4);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(802, 30),
// (803,23): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is (not C4);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(803, 23),
// (901,30): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 and (not C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("C1", "C3").WithLocation(901, 30),
// (902,30): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is C1 and (not C4);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(902, 30),
// (903,23): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is (not C4);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(903, 23)
);
}
[Fact]
public void PatternWrongType_ListPattern_01_BindListPattern_UnionType_Out()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test11(S1 u)
{
#line 1100
_ = u is [] and C2;
_ = u is [] and C4;
_ = u is string and ['a'];
}
static void Test21(S1? u)
{
#line 2100
_ = u is [] and C2;
_ = u is [] and C4;
_ = u is string and ['a'];
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (1100,18): error CS8985: List patterns may not be used for a value of type 'object'. No suitable 'Length' or 'Count' property was found.
// _ = u is [] and C2;
Diagnostic(ErrorCode.ERR_ListPatternRequiresLength, "[]").WithArguments("object").WithLocation(1100, 18),
// (1100,18): error CS0021: Cannot apply indexing with [] to an expression of type 'object'
// _ = u is [] and C2;
Diagnostic(ErrorCode.ERR_BadIndexLHS, "[]").WithArguments("object").WithLocation(1100, 18),
// (1101,18): error CS8985: List patterns may not be used for a value of type 'object'. No suitable 'Length' or 'Count' property was found.
// _ = u is [] and C4;
Diagnostic(ErrorCode.ERR_ListPatternRequiresLength, "[]").WithArguments("object").WithLocation(1101, 18),
// (1101,18): error CS0021: Cannot apply indexing with [] to an expression of type 'object'
// _ = u is [] and C4;
Diagnostic(ErrorCode.ERR_BadIndexLHS, "[]").WithArguments("object").WithLocation(1101, 18),
// (1101,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is [] and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(1101, 25),
// (2100,18): error CS8985: List patterns may not be used for a value of type 'object'. No suitable 'Length' or 'Count' property was found.
// _ = u is [] and C2;
Diagnostic(ErrorCode.ERR_ListPatternRequiresLength, "[]").WithArguments("object").WithLocation(2100, 18),
// (2100,18): error CS0021: Cannot apply indexing with [] to an expression of type 'object'
// _ = u is [] and C2;
Diagnostic(ErrorCode.ERR_BadIndexLHS, "[]").WithArguments("object").WithLocation(2100, 18),
// (2101,18): error CS8985: List patterns may not be used for a value of type 'object'. No suitable 'Length' or 'Count' property was found.
// _ = u is [] and C4;
Diagnostic(ErrorCode.ERR_ListPatternRequiresLength, "[]").WithArguments("object").WithLocation(2101, 18),
// (2101,18): error CS0021: Cannot apply indexing with [] to an expression of type 'object'
// _ = u is [] and C4;
Diagnostic(ErrorCode.ERR_BadIndexLHS, "[]").WithArguments("object").WithLocation(2101, 18),
// (2101,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is [] and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(2101, 25)
);
}
[Fact]
public void PatternWrongType_VarDeconstructionPattern_01_UnionType_Out()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class C3;
class C4 : C1;
class C5 : C2;
";
var src2 = @"
class Program
{
static void Test1(S1 u)
{
#line 100
_ = u is var (a, b) and C2;
_ = u is var (c, d) and C4;
}
static void Test2(S1? u)
{
#line 200
_ = u is var (a, b) and C2;
_ = u is var (c, d) and C4;
}
}
static class Extensions
{
public static void Deconstruct(this object o, out int x, out int y)
{
x = 1;
y = 2;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (101,33): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is var (c, d) and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(101, 33),
// (201,33): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C4'.
// _ = u is var (c, d) and C4;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C4").WithArguments("S1", "C4").WithLocation(201, 33)
);
}
[Fact]
public void PatternWrongType_ConstantPattern_01_BindConstantPatternWithFallbackToTypePattern_UnionType_In_01()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(C1 x) { _value = x; }
public object Value => _value;
}
class C1
{
public static implicit operator C1(string c) => null;
}
class C2;
";
var src2 = @"
class Program
{
static void Test1(S1 u)
{
#line 100
_ = u is {} and ""1"";
_ = u is C1 and (C2)null;
_ = u is C1 and ""1"";
_ = u is System.IComparable and ""1"";
_ = u is ""1"";
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,25): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is {} and "1";
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, @"""1""").WithArguments("S1").WithLocation(100, 25),
// (100,25): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and "1";
Diagnostic(ErrorCode.ERR_PatternWrongType, @"""1""").WithArguments("C1", "string").WithLocation(100, 25),
// (100,25): error CS0029: Cannot implicitly convert type 'string' to 'int'
// _ = u is {} and "1";
Diagnostic(ErrorCode.ERR_NoImplicitConv, @"""1""").WithArguments("string", "int").WithLocation(100, 25),
// (101,25): error CS0029: Cannot implicitly convert type 'C2' to 'C1'
// _ = u is C1 and (C2)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(C2)null").WithArguments("C2", "C1").WithLocation(101, 25),
// (102,25): error CS9135: A constant value of type 'C1' is expected
// _ = u is C1 and "1";
Diagnostic(ErrorCode.ERR_ConstantValueOfTypeExpected, @"""1""").WithArguments("C1").WithLocation(102, 25),
// (103,41): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is System.IComparable and "1";
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, @"""1""").WithArguments("S1").WithLocation(103, 41),
// (103,41): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'string'.
// _ = u is System.IComparable and "1";
Diagnostic(ErrorCode.ERR_PatternWrongType, @"""1""").WithArguments("C1", "string").WithLocation(103, 41),
// (103,41): error CS0029: Cannot implicitly convert type 'string' to 'int'
// _ = u is System.IComparable and "1";
Diagnostic(ErrorCode.ERR_NoImplicitConv, @"""1""").WithArguments("string", "int").WithLocation(103, 41),
// (104,18): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is "1";
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, @"""1""").WithArguments("S1").WithLocation(104, 18),
// (104,18): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'string'.
// _ = u is "1";
Diagnostic(ErrorCode.ERR_PatternWrongType, @"""1""").WithArguments("C1", "string").WithLocation(104, 18),
// (104,18): error CS0029: Cannot implicitly convert type 'string' to 'int'
// _ = u is "1";
Diagnostic(ErrorCode.ERR_NoImplicitConv, @"""1""").WithArguments("string", "int").WithLocation(104, 18)
);
}
[Fact]
public void PatternWrongType_ConstantPattern_01_BindConstantPatternWithFallbackToTypePattern_UnionType_In_02()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(C1 x) { _value = x; }
public object Value => _value;
}
class C1
{
public static implicit operator C1(string c) => null;
}
class C2;
";
var src2 = @"
class Program
{
static void Test1(S1? u)
{
#line 100
_ = u is {} and ""1"";
_ = u is C1 and (C2)null;
_ = u is C1 and ""1"";
_ = u is System.IComparable and ""1"";
_ = u is ""1"";
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,25): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is {} and "1";
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, @"""1""").WithArguments("S1").WithLocation(100, 25),
// (100,25): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and "1";
Diagnostic(ErrorCode.ERR_PatternWrongType, @"""1""").WithArguments("C1", "string").WithLocation(100, 25),
// (100,25): error CS0029: Cannot implicitly convert type 'string' to 'int'
// _ = u is {} and "1";
Diagnostic(ErrorCode.ERR_NoImplicitConv, @"""1""").WithArguments("string", "int").WithLocation(100, 25),
// (101,25): error CS0029: Cannot implicitly convert type 'C2' to 'C1'
// _ = u is C1 and (C2)null;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "(C2)null").WithArguments("C2", "C1").WithLocation(101, 25),
// (102,25): error CS9135: A constant value of type 'C1' is expected
// _ = u is C1 and "1";
Diagnostic(ErrorCode.ERR_ConstantValueOfTypeExpected, @"""1""").WithArguments("C1").WithLocation(102, 25),
// (103,41): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is System.IComparable and "1";
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, @"""1""").WithArguments("S1").WithLocation(103, 41),
// (103,41): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'string'.
// _ = u is System.IComparable and "1";
Diagnostic(ErrorCode.ERR_PatternWrongType, @"""1""").WithArguments("C1", "string").WithLocation(103, 41),
// (103,41): error CS0029: Cannot implicitly convert type 'string' to 'int'
// _ = u is System.IComparable and "1";
Diagnostic(ErrorCode.ERR_NoImplicitConv, @"""1""").WithArguments("string", "int").WithLocation(103, 41),
// (104,18): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is "1";
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, @"""1""").WithArguments("S1").WithLocation(104, 18),
// (104,18): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'string'.
// _ = u is "1";
Diagnostic(ErrorCode.ERR_PatternWrongType, @"""1""").WithArguments("C1", "string").WithLocation(104, 18),
// (104,18): error CS0029: Cannot implicitly convert type 'string' to 'int'
// _ = u is "1";
Diagnostic(ErrorCode.ERR_NoImplicitConv, @"""1""").WithArguments("string", "int").WithLocation(104, 18)
);
}
[Fact]
public void PatternWrongType_ConstantPattern_02_BindConstantPatternWithFallbackToTypePattern_UnionType_Out()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(byte x) { _value = x; }
public object Value => _value;
}
class C2;
";
var src2 = @"
class Program
{
static void Test1(S1 u)
{
#line 100
_ = u is null and C2;
_ = u is 1 and byte;
}
static void Test2(S1? u)
{
#line 200
_ = u is null and C2;
_ = u is 1 and byte;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,27): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C2'.
// _ = u is null and C2;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C2").WithArguments("S1", "C2").WithLocation(100, 27),
// (101,24): error CS8121: An expression of type 'int' cannot be handled by a pattern of type 'byte'.
// _ = u is 1 and byte;
Diagnostic(ErrorCode.ERR_PatternWrongType, "byte").WithArguments("int", "byte").WithLocation(101, 24),
// (200,27): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C2'.
// _ = u is null and C2;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C2").WithArguments("S1", "C2").WithLocation(200, 27),
// (201,24): error CS8121: An expression of type 'int' cannot be handled by a pattern of type 'byte'.
// _ = u is 1 and byte;
Diagnostic(ErrorCode.ERR_PatternWrongType, "byte").WithArguments("int", "byte").WithLocation(201, 24)
);
}
[Fact]
public void PatternWrongType_ConstantPattern_03_BindIsOperator_UnionType_In()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(byte x) { _value = x; }
public object Value => _value;
}
";
var src2 = @"
class Program
{
static void Test1(S1 u)
{
const string empty ="""";
#line 100
_ = u is empty;
}
static void Test2(S1? u)
{
const string empty ="""";
#line 200
_ = u is empty;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,18): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is empty;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "empty").WithArguments("S1").WithLocation(100, 18),
// (100,18): error CS0029: Cannot implicitly convert type 'string' to 'int'
// _ = u is empty;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "empty").WithArguments("string", "int").WithLocation(100, 18),
// (100,18): error CS0029: Cannot implicitly convert type 'string' to 'byte'
// _ = u is empty;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "empty").WithArguments("string", "byte").WithLocation(100, 18),
// (200,18): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is empty;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "empty").WithArguments("S1").WithLocation(200, 18),
// (200,18): error CS0029: Cannot implicitly convert type 'string' to 'int'
// _ = u is empty;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "empty").WithArguments("string", "int").WithLocation(200, 18),
// (200,18): error CS0029: Cannot implicitly convert type 'string' to 'byte'
// _ = u is empty;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "empty").WithArguments("string", "byte").WithLocation(200, 18)
);
}
[Fact]
public void PatternWrongType_ConstantPattern_04_UnionType_In()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(byte x) { _value = x; }
public object Value => _value;
}
";
var src2 = @"
class Program
{
static void Test1(S1 u)
{
const string empty ="""";
#line 100
switch (u)
{
case 1:
goto case empty;
}
}
static void Test2(S1? u)
{
const string empty ="""";
#line 200
switch (u)
{
case 1:
goto case empty;
}
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (102,13): error CS8070: Control cannot fall out of switch from final case label ('case 1:')
// case 1:
Diagnostic(ErrorCode.ERR_SwitchFallOut, "case 1:").WithArguments("case 1:").WithLocation(102, 13),
// The following error is expected per language specification (https://github.com/dotnet/csharpstandard/blob/draft-v8/standard/statements.md#13104-the-goto-statement):
// "if the constant_expression is not implicitly convertible (§10.2) to the governing type of the nearest enclosing switch statement, a compile-time error occurs."
// (103,17): error CS0029: Cannot implicitly convert type 'string' to 'S1'
// goto case empty;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "goto case empty;").WithArguments("string", "S1").WithLocation(103, 17),
// (202,13): error CS8070: Control cannot fall out of switch from final case label ('case 1:')
// case 1:
Diagnostic(ErrorCode.ERR_SwitchFallOut, "case 1:").WithArguments("case 1:").WithLocation(202, 13),
// The following error is expected per language specification (https://github.com/dotnet/csharpstandard/blob/draft-v8/standard/statements.md#13104-the-goto-statement):
// "if the constant_expression is not implicitly convertible (§10.2) to the governing type of the nearest enclosing switch statement, a compile-time error occurs."
// (203,17): error CS0029: Cannot implicitly convert type 'string' to 'S1?'
// goto case empty;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "goto case empty;").WithArguments("string", "S1?").WithLocation(203, 17)
);
}
[Fact]
public void PatternWrongType_RelationalPattern_01_BindRelationalPattern_UnionType_In_01()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(string x) { _value = x; }
public S1(C1 x) { _value = x; }
public object Value => _value;
}
class C1
{
public static implicit operator C1(int c) => null;
}
class C2;
";
var src2 = @"
class Program
{
static void Test1(S1 u)
{
#line 100
_ = u is {} and > 1;
_ = u is C1 and > 1;
_ = u is System.IComparable and > 1;
_ = u is > 1;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,27): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is {} and > 1;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "1").WithArguments("S1").WithLocation(100, 27),
// (100,27): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and > 1;
Diagnostic(ErrorCode.ERR_PatternWrongType, "1").WithArguments("C1", "int").WithLocation(100, 27),
// (100,27): error CS0029: Cannot implicitly convert type 'int' to 'string'
// _ = u is {} and > 1;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "1").WithArguments("int", "string").WithLocation(100, 27),
// (101,27): error CS9135: A constant value of type 'C1' is expected
// _ = u is C1 and > 1;
Diagnostic(ErrorCode.ERR_ConstantValueOfTypeExpected, "1").WithArguments("C1").WithLocation(101, 27),
// (102,43): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is System.IComparable and > 1;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "1").WithArguments("S1").WithLocation(102, 43),
// (102,43): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'int'.
// _ = u is System.IComparable and > 1;
Diagnostic(ErrorCode.ERR_PatternWrongType, "1").WithArguments("C1", "int").WithLocation(102, 43),
// (102,43): error CS0029: Cannot implicitly convert type 'int' to 'string'
// _ = u is System.IComparable and > 1;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "1").WithArguments("int", "string").WithLocation(102, 43),
// (103,20): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is > 1;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "1").WithArguments("S1").WithLocation(103, 20),
// (103,20): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'int'.
// _ = u is > 1;
Diagnostic(ErrorCode.ERR_PatternWrongType, "1").WithArguments("C1", "int").WithLocation(103, 20),
// (103,20): error CS0029: Cannot implicitly convert type 'int' to 'string'
// _ = u is > 1;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "1").WithArguments("int", "string").WithLocation(103, 20)
);
}
[Fact]
public void PatternWrongType_RelationalPattern_01_BindRelationalPattern_UnionType_In_02()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(string x) { _value = x; }
public S1(C1 x) { _value = x; }
public object Value => _value;
}
class C1
{
public static implicit operator C1(int c) => null;
}
class C2;
";
var src2 = @"
class Program
{
static void Test1(S1? u)
{
#line 100
_ = u is {} and > 1;
_ = u is C1 and > 1;
_ = u is System.IComparable and > 1;
_ = u is > 1;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,27): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is {} and > 1;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "1").WithArguments("S1").WithLocation(100, 27),
// (100,27): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and > 1;
Diagnostic(ErrorCode.ERR_PatternWrongType, "1").WithArguments("C1", "int").WithLocation(100, 27),
// (100,27): error CS0029: Cannot implicitly convert type 'int' to 'string'
// _ = u is {} and > 1;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "1").WithArguments("int", "string").WithLocation(100, 27),
// (101,27): error CS9135: A constant value of type 'C1' is expected
// _ = u is C1 and > 1;
Diagnostic(ErrorCode.ERR_ConstantValueOfTypeExpected, "1").WithArguments("C1").WithLocation(101, 27),
// (102,43): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is System.IComparable and > 1;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "1").WithArguments("S1").WithLocation(102, 43),
// (102,43): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'int'.
// _ = u is System.IComparable and > 1;
Diagnostic(ErrorCode.ERR_PatternWrongType, "1").WithArguments("C1", "int").WithLocation(102, 43),
// (102,43): error CS0029: Cannot implicitly convert type 'int' to 'string'
// _ = u is System.IComparable and > 1;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "1").WithArguments("int", "string").WithLocation(102, 43),
// (103,20): error CS9372: An expression of type 'S1' cannot be handled by this pattern, see additional errors at this location.
// _ = u is > 1;
Diagnostic(ErrorCode.ERR_UnionMatchingWrongPattern, "1").WithArguments("S1").WithLocation(103, 20),
// (103,20): error CS8121: An expression of type 'C1' cannot be handled by a pattern of type 'int'.
// _ = u is > 1;
Diagnostic(ErrorCode.ERR_PatternWrongType, "1").WithArguments("C1", "int").WithLocation(103, 20),
// (103,20): error CS0029: Cannot implicitly convert type 'int' to 'string'
// _ = u is > 1;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "1").WithArguments("int", "string").WithLocation(103, 20)
);
}
[Fact]
public void PatternWrongType_RelationalPattern_02_BindRelationalPattern_UnionType_Out()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(byte x) { _value = x; }
public object Value => _value;
}
class C2;
";
var src2 = @"
class Program
{
static void Test1(S1 u)
{
#line 100
_ = u is > 1 and byte;
}
static void Test2(S1? u)
{
#line 200
_ = u is > 1 and byte;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,26): error CS8121: An expression of type 'int' cannot be handled by a pattern of type 'byte'.
// _ = u is > 1 and byte;
Diagnostic(ErrorCode.ERR_PatternWrongType, "byte").WithArguments("int", "byte").WithLocation(100, 26),
// (200,26): error CS8121: An expression of type 'int' cannot be handled by a pattern of type 'byte'.
// _ = u is > 1 and byte;
Diagnostic(ErrorCode.ERR_PatternWrongType, "byte").WithArguments("int", "byte").WithLocation(200, 26)
);
}
[Fact]
public void PatternWrongType_BinaryPattern_01_Disjunction_Snap_To_Previous_UnionType_01()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2;
class C3;
";
var src2 = @"
class Program
{
static void Test1(S1 u)
{
#line 100
_ = u is int or string or C3;
_ = u is int or (string or C3);
_ = u is C1 or string or C3;
_ = u is int or C2 or C3;
_ = u is int or string or C1;
_ = u is int or (C2 or C3);
_ = u is int or (string or C1);
_ = u is (int or string) or C3;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(100, 18),
// (100,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is int or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(100, 25),
// (100,35): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is int or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(100, 35),
// (101,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or (string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(101, 18),
// (101,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is int or (string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(101, 26),
// (101,36): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is int or (string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(101, 36),
// (102,24): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is C1 or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(102, 24),
// (102,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(102, 34),
// (103,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or C2 or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(103, 18),
// (103,31): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is int or C2 or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(103, 31),
// (104,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or string or C1;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(104, 18),
// (104,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is int or string or C1;
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(104, 25),
// (105,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or (C2 or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(105, 18),
// (105,32): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is int or (C2 or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(105, 32),
// (106,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or (string or C1);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(106, 18),
// (106,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is int or (string or C1);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(106, 26),
// (107,19): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is (int or string) or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(107, 19),
// (107,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is (int or string) or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(107, 26),
// (107,37): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is (int or string) or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(107, 37)
);
}
[Fact]
public void PatternWrongType_BinaryPattern_01_Disjunction_Snap_To_Previous_UnionType_02()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2;
class C3;
";
var src2 = @"
class Program
{
static void Test1(S1? u)
{
#line 100
_ = u is int or string or C3;
_ = u is int or (string or C3);
_ = u is C1 or string or C3;
_ = u is int or C2 or C3;
_ = u is int or string or C1;
_ = u is int or (C2 or C3);
_ = u is int or (string or C1);
_ = u is (int or string) or C3;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(100, 18),
// (100,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is int or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(100, 25),
// (100,35): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is int or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(100, 35),
// (101,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or (string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(101, 18),
// (101,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is int or (string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(101, 26),
// (101,36): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is int or (string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(101, 36),
// (102,24): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is C1 or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(102, 24),
// (102,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is C1 or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(102, 34),
// (103,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or C2 or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(103, 18),
// (103,31): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is int or C2 or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(103, 31),
// (104,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or string or C1;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(104, 18),
// (104,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is int or string or C1;
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(104, 25),
// (105,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or (C2 or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(105, 18),
// (105,32): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is int or (C2 or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(105, 32),
// (106,18): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is int or (string or C1);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(106, 18),
// (106,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is int or (string or C1);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(106, 26),
// (107,19): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is (int or string) or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(107, 19),
// (107,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is (int or string) or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(107, 26),
// (107,37): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is (int or string) or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(107, 37)
);
}
[Fact]
public void PatternWrongType_BinaryPattern_02_Disjunction_Snap_To_Previous_UnionType_01()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2;
class C3;
";
var src2 = @"
class Program
{
static void Test1(S1 u)
{
#line 100
_ = u is {} and (int or string or C3);
_ = u is {} and (int or (string or C3));
_ = u is {} and (C1 or string or C3);
_ = u is {} and (int or C2 or C3);
_ = u is {} and (int or string or C1);
_ = u is {} and (int or (C2 or C3));
_ = u is {} and (int or (string or C1));
_ = u is {} and ((int or string) or C3);
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(100, 26),
// (100,33): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(100, 33),
// (100,43): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(100, 43),
// (101,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(101, 26),
// (101,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (int or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(101, 34),
// (101,44): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(101, 44),
// (102,32): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (C1 or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(102, 32),
// (102,42): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (C1 or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(102, 42),
// (103,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or C2 or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(103, 26),
// (103,39): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or C2 or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(103, 39),
// (104,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or string or C1);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(104, 26),
// (104,33): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (int or string or C1);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(104, 33),
// (105,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or (C2 or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(105, 26),
// (105,40): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or (C2 or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(105, 40),
// (106,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or (string or C1));
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(106, 26),
// (106,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (int or (string or C1));
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(106, 34),
// (107,27): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and ((int or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(107, 27),
// (107,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and ((int or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(107, 34),
// (107,45): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and ((int or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(107, 45)
);
}
[Fact]
public void PatternWrongType_BinaryPattern_02_Disjunction_Snap_To_Previous_UnionType_02()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2;
class C3;
";
var src2 = @"
class Program
{
static void Test1(S1? u)
{
#line 100
_ = u is {} and (int or string or C3);
_ = u is {} and (int or (string or C3));
_ = u is {} and (C1 or string or C3);
_ = u is {} and (int or C2 or C3);
_ = u is {} and (int or string or C1);
_ = u is {} and (int or (C2 or C3));
_ = u is {} and (int or (string or C1));
_ = u is {} and ((int or string) or C3);
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(100, 26),
// (100,33): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(100, 33),
// (100,43): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(100, 43),
// (101,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(101, 26),
// (101,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (int or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(101, 34),
// (101,44): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(101, 44),
// (102,32): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (C1 or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(102, 32),
// (102,42): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (C1 or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(102, 42),
// (103,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or C2 or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(103, 26),
// (103,39): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or C2 or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(103, 39),
// (104,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or string or C1);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(104, 26),
// (104,33): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (int or string or C1);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(104, 33),
// (105,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or (C2 or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(105, 26),
// (105,40): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or (C2 or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(105, 40),
// (106,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or (string or C1));
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(106, 26),
// (106,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (int or (string or C1));
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(106, 34),
// (107,27): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and ((int or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(107, 27),
// (107,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is {} and ((int or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(107, 34),
// (107,45): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and ((int or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(107, 45)
);
}
[Fact]
public void PatternWrongType_BinaryPattern_03_Disjunction_Snap_To_Previous_UnionType()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2;
class C3;
";
var src2 = @"
class Program
{
static void Test1(object u)
{
#line 100
_ = u is (S1 and int) or string or C3;
_ = u is (S1 and int) or (string or C3);
_ = u is int or (S1 and C2) or C3;
_ = u is int or ((S1 and C2) or C3);
_ = u is ((S1 and int) or string) or C3;
_ = u is S1 and int or string or C3;
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is (S1 and int) or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(100, 26),
// (101,26): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is (S1 and int) or (string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(101, 26),
// (104,27): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is ((S1 and int) or string) or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(104, 27),
// (105,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is S1 and int or string or C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(105, 25)
);
}
[Fact]
public void PatternWrongType_BinaryPattern_04_Disjunction_Snap_To_Previous_UnionType_01()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S0
{
private readonly object _value;
public S0(byte x) { _value = x; }
public S0(S1 x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2;
class C3;
";
var src2 = @"
class Program
{
static void Test1(S0 u)
{
#line 100
_ = u is {} and ((S1 and int) or string or C3);
_ = u is {} and ((S1 and int) or (string or C3));
_ = u is {} and (int or (S1 and C2) or C3);
_ = u is {} and (int or ((S1 and C2) or C3));
_ = u is {} and (((S1 and int) or string) or C3);
_ = u is {} and (S1 and int or string or C3);
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and ((S1 and int) or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(100, 34),
// (100,42): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'string'.
// _ = u is {} and ((S1 and int) or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S0", "string").WithLocation(100, 42),
// (100,52): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and ((S1 and int) or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(100, 52),
// (101,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and ((S1 and int) or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(101, 34),
// (101,43): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'string'.
// _ = u is {} and ((S1 and int) or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S0", "string").WithLocation(101, 43),
// (101,53): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and ((S1 and int) or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(101, 53),
// (102,26): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or (S1 and C2) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S0", "int").WithLocation(102, 26),
// (102,48): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or (S1 and C2) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(102, 48),
// (103,26): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or ((S1 and C2) or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S0", "int").WithLocation(103, 26),
// (103,49): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or ((S1 and C2) or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(103, 49),
// (104,35): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (((S1 and int) or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(104, 35),
// (104,43): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (((S1 and int) or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S0", "string").WithLocation(104, 43),
// (104,54): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (((S1 and int) or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(104, 54),
// (105,33): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (S1 and int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(105, 33),
// (105,40): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (S1 and int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S0", "string").WithLocation(105, 40),
// (105,50): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (S1 and int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(105, 50)
);
}
[Fact]
public void PatternWrongType_BinaryPattern_04_Disjunction_Snap_To_Previous_UnionType_02()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S0
{
private readonly object _value;
public S0(byte x) { _value = x; }
public S0(S1 x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2;
class C3;
";
var src2 = @"
class Program
{
static void Test1(S0? u)
{
#line 100
_ = u is {} and ((S1 and int) or string or C3);
_ = u is {} and ((S1 and int) or (string or C3));
_ = u is {} and (int or (S1 and C2) or C3);
_ = u is {} and (int or ((S1 and C2) or C3));
_ = u is {} and (((S1 and int) or string) or C3);
_ = u is {} and (S1 and int or string or C3);
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and ((S1 and int) or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(100, 34),
// (100,42): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'string'.
// _ = u is {} and ((S1 and int) or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S0", "string").WithLocation(100, 42),
// (100,52): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and ((S1 and int) or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(100, 52),
// (101,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and ((S1 and int) or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(101, 34),
// (101,43): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'string'.
// _ = u is {} and ((S1 and int) or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S0", "string").WithLocation(101, 43),
// (101,53): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and ((S1 and int) or (string or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(101, 53),
// (102,26): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or (S1 and C2) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S0", "int").WithLocation(102, 26),
// (102,48): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or (S1 and C2) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(102, 48),
// (103,26): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (int or ((S1 and C2) or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S0", "int").WithLocation(103, 26),
// (103,49): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (int or ((S1 and C2) or C3));
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(103, 49),
// (104,35): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (((S1 and int) or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(104, 35),
// (104,43): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (((S1 and int) or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S0", "string").WithLocation(104, 43),
// (104,54): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (((S1 and int) or string) or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(104, 54),
// (105,33): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// _ = u is {} and (S1 and int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(105, 33),
// (105,40): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'string'.
// _ = u is {} and (S1 and int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S0", "string").WithLocation(105, 40),
// (105,50): error CS8121: An expression of type 'S0' cannot be handled by a pattern of type 'C3'.
// _ = u is {} and (S1 and int or string or C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S0", "C3").WithLocation(105, 50)
);
}
[Fact]
public void PatternWrongType_BinaryPattern_05_Conjunction_Pass_UnionType_Through()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
struct S0
{
private readonly object _value;
public S0(byte x) { _value = x; }
public S0(S1 x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2;
class C3;
";
var src2 = @"
class Program
{
static void Test1(object u)
{
#line 100
_ = u is S1 and string;
_ = u is (S1 and object) and C3;
_ = u is S1 and object and C3;
}
static void Test2(object u)
{
#line 200
_ = u is S0 and S1 and C3;
_ = u is (S0 and S1) and C3;
_ = u is S0 and (S1 and C3);
}
}
";
var comp = CreateCompilation([src2, src1, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp);
comp.VerifyDiagnostics(
// (100,25): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'string'.
// _ = u is S1 and string;
Diagnostic(ErrorCode.ERR_PatternWrongType, "string").WithArguments("S1", "string").WithLocation(100, 25),
// (101,38): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is (S1 and object) and C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(101, 38),
// (102,36): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is S1 and object and C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(102, 36),
// (200,32): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is S0 and S1 and C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(200, 32),
// (201,34): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is (S0 and S1) and C3;
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(201, 34),
// (202,33): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// _ = u is S0 and (S1 and C3);
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(202, 33)
);
}
[Fact]
public void Exhaustiveness_01()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
#nullable enable
public S1(string x) { _value = x; }
public object? Value => _value;
#nullable disable
}
class Program
{
static int Test1(S1 u)
{
#line 100
return u switch { int => 1, string => 2, null => 3 };
}
static int Test2(S1 u)
{
#line 200
return u switch { int => 1, null => 3, string => 2 };
}
static int Test3(S1 u)
{
#line 300
return u switch { null => 3, int => 1, string => 2 };
}
static int Test4(S1 u)
{
#line 400
return u switch { int => 1, string => 2 };
}
static int Test5(S1 u)
{
#nullable enable
#line 500
return u switch { int => 1, string => 2 };
#nullable disable
}
static int Test6(S1 u)
{
#line 600
return u switch { int => 1, null => 3 };
}
static int Test7(S1 u)
{
#line 700
return u switch { null => 3, int => 1 };
}
static int Test8(S1 u)
{
#line 800
return u switch { int => 1 };
}
static int Test9(S1 u)
{
#line 900
return u switch { not int => 1 };
}
static int Test10(S1 u)
{
#line 1000
return u switch { null => 3, not int => 1 };
}
static int Test11(S1 u)
{
#line 1100
return u switch { not null => 1 };
}
static int Test11_5(S1 u)
{
#nullable enable
#line 1150
return u switch { not null => 1 };
#nullable disable
}
static int Test12(S1 u)
{
#line 1200
return u switch { null => 3, not null => 1 };
}
static int Test13(S1 u)
{
#line 1300
return u switch { not null => 3, null => 1 };
}
static int Test14(S1 u)
{
#line 1400
return u switch { { } => 1, null => 3 };
}
static int Test15(S1 u)
{
#line 1500
return u switch { null => 3, var x => 1 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
var verifier = CompileAndVerify(comp).VerifyDiagnostics(
// (100,50): hidden CS9335: The pattern is redundant.
// return u switch { int => 1, string => 2, null => 3 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(100, 50),
// (200,48): hidden CS9335: The pattern is redundant.
// return u switch { int => 1, null => 3, string => 2 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "string").WithLocation(200, 48),
// (300,48): hidden CS9335: The pattern is redundant.
// return u switch { null => 3, int => 1, string => 2 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "string").WithLocation(300, 48),
// (500,18): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// return u switch { int => 1, string => 2 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(500, 18),
// (600,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'string' is not covered.
// return u switch { int => 1, null => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("string").WithLocation(600, 18),
// (700,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'string' is not covered.
// return u switch { null => 3, int => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("string").WithLocation(700, 18),
// (800,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'string' is not covered.
// return u switch { int => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("string").WithLocation(800, 18),
// (900,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'int' is not covered.
// return u switch { not int => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("int").WithLocation(900, 18),
// (1000,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'int' is not covered.
// return u switch { null => 3, not int => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("int").WithLocation(1000, 18),
// (1150,18): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// return u switch { not null => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(1150, 18),
// (1200,42): hidden CS9335: The pattern is redundant.
// return u switch { null => 3, not null => 1 };
// Note the location, the diagnostic is for 'null' in 'not null' of the second case rather than for 'null' in the first case.
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(1200, 42),
// (1300,42): hidden CS9335: The pattern is redundant.
// return u switch { not null => 3, null => 1 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(1300, 42),
// (1400,37): hidden CS9335: The pattern is redundant.
// return u switch { { } => 1, null => 3 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(1400, 37)
);
verifier.VerifyIL("Program.Test1", @"
{
// Code size 48 (0x30)
.maxstack 1
.locals init (int V_0,
object V_1)
IL_0000: ldarga.s V_0
IL_0002: call ""object S1.Value.get""
IL_0007: stloc.1
IL_0008: ldloc.1
IL_0009: isinst ""int""
IL_000e: brtrue.s IL_001d
IL_0010: ldloc.1
IL_0011: isinst ""string""
IL_0016: brtrue.s IL_0021
IL_0018: ldloc.1
IL_0019: brfalse.s IL_0025
IL_001b: br.s IL_0029
IL_001d: ldc.i4.1
IL_001e: stloc.0
IL_001f: br.s IL_002e
IL_0021: ldc.i4.2
IL_0022: stloc.0
IL_0023: br.s IL_002e
IL_0025: ldc.i4.3
IL_0026: stloc.0
IL_0027: br.s IL_002e
IL_0029: call ""void <PrivateImplementationDetails>.ThrowInvalidOperationException()""
IL_002e: ldloc.0
IL_002f: ret
}
");
}
[Fact]
public void Exhaustiveness_02()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int? x) { _value = x; }
#nullable enable
public S1(string x) { _value = x; }
public object? Value => _value;
#nullable disable
}
class Program
{
static int Test1(S1 u)
{
#line 100
return u switch { int => 1, string => 2, null => 3 };
}
static int Test2(S1 u)
{
#line 200
return u switch { int => 1, null => 3, string => 2 };
}
static int Test3(S1 u)
{
#line 300
return u switch { null => 3, int => 1, string => 2 };
}
static int Test4(S1 u)
{
#line 400
return u switch { int => 1, string => 2 };
}
static int Test5(S1 u)
{
#nullable enable
#line 500
return u switch { int => 1, string => 2 };
#nullable disable
}
static int Test6(S1 u)
{
#line 600
return u switch { int => 1, null => 3 };
}
static int Test7(S1 u)
{
#line 700
return u switch { null => 3, int => 1 };
}
static int Test8(S1 u)
{
#line 800
return u switch { int => 1 };
}
static int Test9(S1 u)
{
#line 900
return u switch { not int => 1 };
}
static int Test10(S1 u)
{
#line 1000
return u switch { null => 3, not int => 1 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,50): hidden CS9335: The pattern is redundant.
// return u switch { int => 1, string => 2, null => 3 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(100, 50),
// (200,48): hidden CS9335: The pattern is redundant.
// return u switch { int => 1, null => 3, string => 2 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "string").WithLocation(200, 48),
// (300,48): hidden CS9335: The pattern is redundant.
// return u switch { null => 3, int => 1, string => 2 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "string").WithLocation(300, 48),
// (500,18): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// return u switch { int => 1, string => 2 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(500, 18),
// (600,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'string' is not covered.
// return u switch { int => 1, null => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("string").WithLocation(600, 18),
// (700,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'string' is not covered.
// return u switch { null => 3, int => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("string").WithLocation(700, 18),
// (800,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'string' is not covered.
// return u switch { int => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("string").WithLocation(800, 18),
// (900,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'int' is not covered.
// return u switch { not int => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("int").WithLocation(900, 18),
// (1000,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'int' is not covered.
// return u switch { null => 3, not int => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("int").WithLocation(1000, 18)
);
}
[Fact]
public void Exhaustiveness_03()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
#nullable enable
public S1(string x) { _value = x; }
public object? Value => _value;
#nullable disable
}
class Program
{
static int Test1(S1 u)
{
#line 100
return u switch { not null => 2, null => 3 };
}
static int Test2(S1 u)
{
#nullable enable
#line 200
return u switch { not null => 2, null => 3 };
#nullable disable
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,42): hidden CS9335: The pattern is redundant.
// return u switch { not null => 2, null => 3 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(100, 42),
// (200,42): hidden CS9335: The pattern is redundant.
// return u switch { not null => 2, null => 3 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(200, 42)
);
}
[Fact]
public void Exhaustiveness_04()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(bool x) { _value = x; }
#nullable enable
public S1(string x) { _value = x; }
public object? Value => _value;
#nullable disable
}
class Program
{
static int Test1(S1 u)
{
#line 100
return u switch { true => 1, false => 4, string => 2, null => 3 };
}
static int Test2(S1 u)
{
#line 200
return u switch { true => 1, false => 4, string => 2 };
}
static int Test3(S1 u)
{
#nullable enable
#line 300
return u switch { true => 1, false => 4, string => 2 };
#nullable disable
}
static int Test4(S1 u)
{
#line 400
return u switch { true => 1, string => 2, null => 3 };
}
static int Test5(S1 u)
{
#line 500
return u switch { null => 3 , true => 1, string => 2 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,63): hidden CS9335: The pattern is redundant.
// return u switch { true => 1, false => 4, string => 2, null => 3 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(100, 63),
// (300,18): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// return u switch { true => 1, false => 4, string => 2 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(300, 18),
// (400,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'false' is not covered.
// return u switch { true => 1, string => 2, null => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("false").WithLocation(400, 18),
// (500,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'false' is not covered.
// return u switch { null => 3 , true => 1, string => 2 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("false").WithLocation(500, 18)
);
}
[Fact]
public void Exhaustiveness_05()
{
var src1 = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
class C1
{
private readonly object? _value;
public C1(){}
public C1(int x) { _value = x; }
public C1(string? x) { _value = x; }
public object? Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new C1(10)));
System.Console.Write(Test1(new C1()));
System.Console.Write(Test1(new C1(""10"")));
System.Console.Write(Test1(null));
System.Console.Write(' ');
System.Console.Write(Test2(new C1(10)));
System.Console.Write(Test2(new C1()));
System.Console.Write(Test2(new C1(""10"")));
System.Console.Write(Test2(null));
}
static int Test1(C1? u)
{
#line 26
return u switch { int => 1, string => 2, null => 3 };
}
static int Test2(C1? u)
{
#line 31
return u switch { int => -1, string => -2, _ => -3 };
}
static int Test3(C2? u)
{
return u switch { { Value: int } => -1, { Value: string } => -2, { Value: null } => -3, _ => -4 };
}
static int Test4(C1? u)
{
return u switch { _ => 3 };
}
static int Test5(C2 u)
{
#line 46
return u switch { null => -4, { Value: int } => -1, { Value: string } => -2, { Value: object } => -3 };
}
}
class C2
{
public object? Value => null;
}
";
var comp1 = CreateCompilation([src1, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp1, expectedOutput: "1323 -1-3-2-3").VerifyDiagnostics(
// (26,50): hidden CS9335: The pattern is redundant.
// return u switch { int => 1, string => 2, null => 3 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(26, 50),
// (46,18): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern '{ Value: null }' is not covered.
// return u switch { null => -4, { Value: int } => -1, { Value: string } => -2, { Value: object } => -3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("{ Value: null }").WithLocation(46, 18)
);
var src2 = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
class C1
{
private readonly object? _value;
public C1(){}
public C1(int x) { _value = x; }
public C1(string? x) { _value = x; }
public object? Value => _value;
}
class Program
{
static int Test2(C1? u)
{
#line 31
return u switch { int => -1, string => -2, null => -3, _ => -4 };
}
}
class C2
{
public object? Value => null;
}
";
var comp2 = CreateCompilation([src2, UnionAttributeSource]);
comp2.VerifyDiagnostics(
// (31,64): error CS8510: The pattern is unreachable. It has already been handled by a previous arm of the switch expression or it is impossible to match.
// return u switch { int => -1, string => -2, null => -3, _ => -4 };
Diagnostic(ErrorCode.ERR_SwitchArmSubsumed, "_").WithLocation(31, 64)
);
}
[Fact]
public void Exhaustiveness_06()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
class C1
{
private readonly object? _value;
public C1(){}
public C1(int x) { _value = x; }
public C1(string? x) { _value = x; }
public object? Value => _value;
}
class Program
{
static int Test4(C1? u)
{
#line 41
return u switch { int => 1, string => 2, not null => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (41,50): error CS8510: The pattern is unreachable. It has already been handled by a previous arm of the switch expression or it is impossible to match.
// return u switch { int => 1, string => 2, not null => 3 };
Diagnostic(ErrorCode.ERR_SwitchArmSubsumed, "not null").WithLocation(41, 50),
// The following warning is for 'u.Value' missing null check.
// (41,18): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// return u switch { int => 1, string => 2, not null => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(41, 18)
);
}
[Fact]
public void Exhaustiveness_07()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(C1 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class Program
{
static int Test1(S1 u)
{
#line 17
return u switch { int => 1, C2 => 2, null => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (17,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'C1' is not covered.
// return u switch { int => 1, C2 => 2, null => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("C1").WithLocation(17, 18)
);
}
[Fact]
public void Exhaustiveness_08()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
class C1;
class C2 : C1;
class Program
{
static int Test1(S1 u)
{
#line 17
return u switch { int => 1, C1 => 2, null => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (17,46): hidden CS9335: The pattern is redundant.
// return u switch { int => 1, C1 => 2, null => 3 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(17, 46)
);
}
[Fact]
public void Exhaustiveness_09()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(C2 x) { _value = x; }
public object Value => _value;
}
interface I1;
class C2;
class C3;
class Program
{
static int Test1(S1 u)
{
#line 18
return u switch { int => 1, I1 => 2, null => 3 };
}
static int Test2(S1 u)
{
return u switch { int => 1, I1 => 2, C2 => 4, null => 3 };
}
static int Test3(S1 u)
{
return u switch { int => 1, I1 => 2, C3 => 5, C2 => 4, null => 3 };
}
static int Test4(S1 u)
{
return u switch { int => 1, I1 => 2, null => 3, C2 => 4 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (18,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'C2' is not covered.
// return u switch { int => 1, I1 => 2, null => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("C2").WithLocation(18, 18),
// (23,55): hidden CS9335: The pattern is redundant.
// return u switch { int => 1, I1 => 2, C2 => 4, null => 3 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(23, 55),
// (28,46): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'C3'.
// return u switch { int => 1, I1 => 2, C3 => 5, C2 => 4, null => 3 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "C3").WithArguments("S1", "C3").WithLocation(28, 46),
// (33,57): hidden CS9335: The pattern is redundant.
// return u switch { int => 1, I1 => 2, null => 3, C2 => 4 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "C2").WithLocation(33, 57)
);
}
[Fact]
public void Exhaustiveness_10()
{
var src =
@"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(Q x) { _value = x; }
public S1(int x) { _value = x; }
public object Value => _value;
}
class C
{
#line 12
int M2(S1 o) => o switch { not (Q(1, 2.5) { P1: 1 } and Q(3, 4, 5) { P2: 2 }) => 1 };
int M3(S1 o) => o switch { null => 0, not (Q(1, 2.5) { P1: 1 } and Q(3, 4, 5) { P2: 2 }) => 1 };
}
class Q
{
public void Deconstruct(out object o1, out object o2) => throw null!;
public void Deconstruct(out object o1, out object o2, out object o3) => throw null!;
public int P1 = 5;
public int P2 = 6;
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (12,23): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'Q(1, 2.5D) and (3, 4, 5) { P1: 1, P2: 2 }' is not covered.
// int M2(S1 o) => o switch { not (Q(1, 2.5) { P1: 1 } and Q(3, 4, 5) { P2: 2 }) => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("Q(1, 2.5D) and (3, 4, 5) { P1: 1, P2: 2 }").WithLocation(12, 23),
// (13,23): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'Q(1, 2.5D) and (3, 4, 5) { P1: 1, P2: 2 }' is not covered.
// int M3(S1 o) => o switch { null => 0, not (Q(1, 2.5) { P1: 1 } and Q(3, 4, 5) { P2: 2 }) => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("Q(1, 2.5D) and (3, 4, 5) { P1: 1, P2: 2 }").WithLocation(13, 23)
);
}
[Fact]
public void Exhaustiveness_11()
{
var src =
@"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(Q x) { _value = x; }
public S1(int x) { _value = x; }
public object Value => _value;
}
class C
{
int M2(S1 o)
#line 100
=> o switch { int => 1, Q { P1: true } => 2 };
int M3(S1 o)
#line 200
=> o switch { Q { P1: true } => 2, int => 1 };
int M4(S1 o)
#line 300
=> o switch { null => 0, int => 1, Q { P1: true } => 2 };
int M5(S1 o)
#line 400
=> o switch { null => 0, Q { P1: true } => 2, int => 1 };
}
class Q
{
public bool P1 = false;
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,14): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'Q{ P1: false }' is not covered.
// => o switch { int => 1, Q { P1: true } => 2 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("Q{ P1: false }").WithLocation(100, 14),
// (200,14): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'Q{ P1: false }' is not covered.
// => o switch { Q { P1: true } => 2, int => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("Q{ P1: false }").WithLocation(200, 14),
// (300,14): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'Q{ P1: false }' is not covered.
// => o switch { null => 0, int => 1, Q { P1: true } => 2 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("Q{ P1: false }").WithLocation(300, 14),
// (400,14): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'Q{ P1: false }' is not covered.
// => o switch { null => 0, Q { P1: true } => 2, int => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("Q{ P1: false }").WithLocation(400, 14)
);
}
[Fact]
public void Exhaustiveness_12()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
#nullable enable
public S1(string x) { _value = x; }
public object? Value => _value;
#nullable disable
}
class Program
{
static int Test1(S1 u)
{
#line 100
return u switch { object => 1, null => 3 };
}
static int Test3(S1 u)
{
#line 300
return u switch { null => 3, object => 2 };
}
static int Test4(S1 u)
{
#line 400
return u switch { object => 2 };
}
static int Test5(S1 u)
{
#nullable enable
#line 500
return u switch { object => 2 };
#nullable disable
}
static int Test9(S1 u)
{
#line 900
return u switch { not object => 1 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,40): hidden CS9335: The pattern is redundant.
// return u switch { object => 1, null => 3 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(100, 40),
// (300,38): hidden CS9335: The pattern is redundant.
// return u switch { null => 3, object => 2 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "object").WithLocation(300, 38),
// (500,18): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// return u switch { object => 2 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(500, 18),
// (900,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'not null' is not covered.
// return u switch { not object => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("not null").WithLocation(900, 18)
);
}
[Fact]
public void EmptyUnion_01()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public object Value => null!;
}
class Program
{
static int Test1(S1 u)
{
#line 100
return u switch { int => 1, null => 3 };
}
static int Test2(S1 u)
{
#line 200
return u switch { null => 1 };
}
static int Test3(S1 u)
{
#line 300
return u switch { null => 3, object => 1 };
}
static int Test4(S1 u)
{
#line 400
return u switch { int => 1 };
}
static int Test5(S1 u)
{
#line 500
return u switch { object => 1 };
}
static int Test6(S1 u)
{
#line 600
return u switch { not object => 1 };
}
static int Test7(S1 u)
{
#line 700
return u switch { null => 3, not object => 1 };
}
static int Test8(S1 u)
{
#line 800
return u switch { object => 1, null => 3 };
}
static int Test9(S1 u)
{
#line 900
return u switch { not null => 1 };
}
static int Test10(S1 u)
{
#line 1000
return u switch { null => 3, not null => 1 };
}
static int Test11(S1 u)
{
#line 1100
return u switch { not null => 3, null => 1 };
}
static int Test12(S1 u)
{
#line 1200
return u switch { { } => 1, null => 3 };
}
static int Test13(S1 u)
{
#line 1300
return u switch { null => 3, var x => 1 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,27): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// return u switch { int => 1, null => 3 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(100, 27),
// (200,18): warning CS8509: The switch expression does not handle all possible values of its input type (it is not exhaustive). For example, the pattern 'not null' is not covered.
// return u switch { null => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustive, "switch").WithArguments("not null").WithLocation(200, 18),
// (300,38): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'object'.
// return u switch { null => 3, object => 1 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "object").WithArguments("S1", "object").WithLocation(300, 38),
// (400,27): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'int'.
// return u switch { int => 1 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "int").WithArguments("S1", "int").WithLocation(400, 27),
// (500,27): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'object'.
// return u switch { object => 1 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "object").WithArguments("S1", "object").WithLocation(500, 27),
// (600,31): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'object'.
// return u switch { not object => 1 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "object").WithArguments("S1", "object").WithLocation(600, 31),
// (700,43): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'object'.
// return u switch { null => 3, not object => 1 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "object").WithArguments("S1", "object").WithLocation(700, 43),
// (800,27): error CS8121: An expression of type 'S1' cannot be handled by a pattern of type 'object'.
// return u switch { object => 1, null => 3 };
Diagnostic(ErrorCode.ERR_PatternWrongType, "object").WithArguments("S1", "object").WithLocation(800, 27),
// (900,18): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// return u switch { not null => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(900, 18),
// (1000,42): hidden CS9335: The pattern is redundant.
// return u switch { null => 3, not null => 1 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(1000, 42),
// (1100,42): hidden CS9335: The pattern is redundant.
// return u switch { not null => 3, null => 1 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(1100, 42),
// (1200,37): hidden CS9335: The pattern is redundant.
// return u switch { { } => 1, null => 3 };
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(1200, 37)
);
}
[Fact]
public void UnionConversion_01_Implicit()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object Value => _value;
}
class Program
{
static void Main()
{
Test1();
Test2();
Test3();
Test4();
Test5();
}
static S1 Test1()
{
System.Console.Write(""1-"");
/*<bind>*/ return 10; /*</bind>*/
}
static S1 Test2()
{
System.Console.Write(""2-"");
return default;
}
static S1 Test3()
{
System.Console.Write(""3-"");
return default(S1);
}
static S1 Test4()
{
System.Console.Write(""4-"");
return null;
}
static S1 Test5()
{
System.Console.Write(""5-"");
return ""11"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var tree = comp.SyntaxTrees.First();
var model = comp.GetSemanticModel(tree);
var ten = GetSyntax<LiteralExpressionSyntax>(tree, "10");
var symbolInfo = model.GetSymbolInfo(ten);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
Assert.Null(symbolInfo.Symbol);
Assert.Empty(symbolInfo.CandidateSymbols);
var typeInfo = model.GetTypeInfo(ten);
Assert.Equal("System.Int32", typeInfo.Type.ToTestDisplayString());
Assert.Equal("S1", typeInfo.ConvertedType.ToTestDisplayString());
Conversion conversion = model.GetConversion(ten);
Assert.True(conversion.Exists);
Assert.True(conversion.IsValid);
Assert.True(conversion.IsImplicit);
Assert.False(conversion.IsExplicit);
Assert.Equal(ConversionKind.Union, conversion.Kind);
Assert.Equal(LookupResultKind.Viable, conversion.ResultKind);
Assert.True(conversion.IsUnion);
Assert.False(conversion.IsUserDefined);
AssertEx.Equal("S1..ctor(System.Int32 x)", conversion.Method.ToTestDisplayString());
AssertEx.Equal("S1..ctor(System.Int32 x)", conversion.MethodSymbol.ToTestDisplayString());
Assert.Null(conversion.BestUserDefinedConversionAnalysis);
Assert.Equal(Conversion.NoConversion, conversion.UserDefinedFromConversion);
Assert.Equal(Conversion.NoConversion, conversion.UserDefinedToConversion);
Assert.NotNull(conversion.BestUnionConversionAnalysis);
Assert.Empty(conversion.OriginalUserDefinedConversions);
Assert.True(conversion.UnderlyingConversions.IsDefault);
Assert.False(conversion.IsArrayIndex);
Assert.False(conversion.IsExtensionMethod);
CommonConversion commonConversion = conversion.ToCommonConversion();
Assert.True(commonConversion.Exists);
Assert.True(commonConversion.IsImplicit);
Assert.True(commonConversion.IsUnion);
Assert.False(commonConversion.IsUserDefined);
AssertEx.Equal("S1..ctor(System.Int32 x)", commonConversion.MethodSymbol.ToTestDisplayString());
VerifyOperationTreeForTest<ReturnStatementSyntax>(comp, """
IReturnOperation (OperationKind.Return, Type: null) (Syntax: 'return 10;')
ReturnedValue:
IConversionOperation (TryCast: False, Unchecked) (OperatorMethod: S1..ctor(System.Int32 x)) (OperationKind.Conversion, Type: S1, IsImplicit) (Syntax: '10')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False, IsUnion: True) (MethodSymbol: S1..ctor(System.Int32 x))
Operand:
ILiteralOperation (OperationKind.Literal, Type: System.Int32, Constant: 10) (Syntax: '10')
""");
var verifier = CompileAndVerify(comp, expectedOutput: "1-int {10} 2-3-4-string {} 5-string {11}").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 18 (0x12)
.maxstack 1
IL_0000: ldstr ""1-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldc.i4.s 10
IL_000c: newobj ""S1..ctor(int)""
IL_0011: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 20 (0x14)
.maxstack 1
.locals init (S1 V_0)
IL_0000: ldstr ""2-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""S1""
IL_0012: ldloc.0
IL_0013: ret
}
");
verifier.VerifyIL("Program.Test3", @"
{
// Code size 20 (0x14)
.maxstack 1
.locals init (S1 V_0)
IL_0000: ldstr ""3-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""S1""
IL_0012: ldloc.0
IL_0013: ret
}
");
verifier.VerifyIL("Program.Test4", @"
{
// Code size 17 (0x11)
.maxstack 1
IL_0000: ldstr ""4-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldnull
IL_000b: newobj ""S1..ctor(string)""
IL_0010: ret
}
");
verifier.VerifyIL("Program.Test5", @"
{
// Code size 21 (0x15)
.maxstack 1
IL_0000: ldstr ""5-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldstr ""11""
IL_000f: newobj ""S1..ctor(string)""
IL_0014: ret
}
");
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "1-int {10} 2-3-4-string {} 5-string {11}").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (37,27): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// /*<bind>*/ return 10; /*</bind>*/
Diagnostic(ErrorCode.ERR_FeatureInPreview, "10").WithArguments("unions").WithLocation(37, 27),
// (55,16): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return null;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "null").WithArguments("unions").WithLocation(55, 16),
// (61,16): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return "11";
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"""11""").WithArguments("unions").WithLocation(61, 16)
);
}
[Fact]
public void UnionConversion_02_Implicit_Class()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object Value => _value;
}
class Program
{
static void Main()
{
Test1();
Test2();
Test3();
Test4();
Test5();
}
static S1 Test1()
{
System.Console.Write(""1-"");
return 10;
}
static S1 Test2()
{
System.Console.Write(""2-"");
return default;
}
static S1 Test3()
{
System.Console.Write(""3-"");
return default(S1);
}
static S1 Test4()
{
System.Console.Write(""4-"");
return null;
}
static S1 Test5()
{
System.Console.Write(""5-"");
return ""11"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "1-int {10} 2-3-4-5-string {11}").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 18 (0x12)
.maxstack 1
IL_0000: ldstr ""1-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldc.i4.s 10
IL_000c: newobj ""S1..ctor(int)""
IL_0011: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 12 (0xc)
.maxstack 1
IL_0000: ldstr ""2-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldnull
IL_000b: ret
}
");
verifier.VerifyIL("Program.Test3", @"
{
// Code size 12 (0xc)
.maxstack 1
IL_0000: ldstr ""3-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldnull
IL_000b: ret
}
");
verifier.VerifyIL("Program.Test4", @"
{
// Code size 12 (0xc)
.maxstack 1
IL_0000: ldstr ""4-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldnull
IL_000b: ret
}
");
verifier.VerifyIL("Program.Test5", @"
{
// Code size 21 (0x15)
.maxstack 1
IL_0000: ldstr ""5-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldstr ""11""
IL_000f: newobj ""S1..ctor(string)""
IL_0014: ret
}
");
}
[Fact]
public void UnionConversion_03_Cast()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object Value => _value;
}
class Program
{
static void Main()
{
Test1();
Test2();
Test3();
Test4();
Test5();
}
static S1 Test1()
{
System.Console.Write(""1-"");
return /*<bind>*/ (S1)10 /*</bind>*/;
}
static S1 Test2()
{
System.Console.Write(""2-"");
return (S1)default;
}
static S1 Test3()
{
System.Console.Write(""3-"");
return (S1)default(S1);
}
static S1 Test4()
{
System.Console.Write(""4-"");
return (S1)null;
}
static S1 Test5()
{
System.Console.Write(""5-"");
return (S1)""11"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var tree = comp.SyntaxTrees.First();
var model = comp.GetSemanticModel(tree);
var cast = GetSyntax<CastExpressionSyntax>(tree, "(S1)10");
var typeInfo = model.GetTypeInfo(cast);
Assert.Equal("S1", typeInfo.Type.ToTestDisplayString());
Assert.Equal("S1", typeInfo.ConvertedType.ToTestDisplayString());
Conversion conversion = model.GetConversion(cast);
Assert.True(conversion.IsIdentity);
var symbolInfo = model.GetSymbolInfo(cast);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
AssertEx.Equal("S1..ctor(System.Int32 x)", symbolInfo.Symbol.ToTestDisplayString());
Assert.Empty(symbolInfo.CandidateSymbols);
VerifyOperationTreeForTest<CastExpressionSyntax>(comp, """
IConversionOperation (TryCast: False, Unchecked) (OperatorMethod: S1..ctor(System.Int32 x)) (OperationKind.Conversion, Type: S1) (Syntax: '(S1)10')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False, IsUnion: True) (MethodSymbol: S1..ctor(System.Int32 x))
Operand:
ILiteralOperation (OperationKind.Literal, Type: System.Int32, Constant: 10) (Syntax: '10')
""");
var ten = GetSyntax<LiteralExpressionSyntax>(tree, "10");
typeInfo = model.GetTypeInfo(ten);
Assert.Equal("System.Int32", typeInfo.Type.ToTestDisplayString());
Assert.Equal("System.Int32", typeInfo.ConvertedType.ToTestDisplayString());
conversion = model.GetConversion(ten);
Assert.True(conversion.IsIdentity);
var verifier = CompileAndVerify(comp, expectedOutput: "1-int {10} 2-3-4-string {} 5-string {11}").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 18 (0x12)
.maxstack 1
IL_0000: ldstr ""1-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldc.i4.s 10
IL_000c: newobj ""S1..ctor(int)""
IL_0011: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 20 (0x14)
.maxstack 1
.locals init (S1 V_0)
IL_0000: ldstr ""2-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""S1""
IL_0012: ldloc.0
IL_0013: ret
}
");
verifier.VerifyIL("Program.Test3", @"
{
// Code size 20 (0x14)
.maxstack 1
.locals init (S1 V_0)
IL_0000: ldstr ""3-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""S1""
IL_0012: ldloc.0
IL_0013: ret
}
");
verifier.VerifyIL("Program.Test4", @"
{
// Code size 17 (0x11)
.maxstack 1
IL_0000: ldstr ""4-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldnull
IL_000b: newobj ""S1..ctor(string)""
IL_0010: ret
}
");
verifier.VerifyIL("Program.Test5", @"
{
// Code size 21 (0x15)
.maxstack 1
IL_0000: ldstr ""5-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldstr ""11""
IL_000f: newobj ""S1..ctor(string)""
IL_0014: ret
}
");
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.RegularNext);
CompileAndVerify(comp, expectedOutput: "1-int {10} 2-3-4-string {} 5-string {11}").VerifyDiagnostics();
comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe, parseOptions: TestOptions.Regular14);
comp.VerifyDiagnostics(
// (37,27): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return /*<bind>*/ (S1)10 /*</bind>*/;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "(S1)10").WithArguments("unions").WithLocation(37, 27),
// (55,16): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return (S1)null;
Diagnostic(ErrorCode.ERR_FeatureInPreview, "(S1)null").WithArguments("unions").WithLocation(55, 16),
// (61,16): error CS8652: The feature 'unions' is currently in Preview and *unsupported*. To use Preview features, use the 'preview' language version.
// return (S1)"11";
Diagnostic(ErrorCode.ERR_FeatureInPreview, @"(S1)""11""").WithArguments("unions").WithLocation(61, 16)
);
}
[Fact]
public void UnionConversion_04_Cast_Class()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object Value => _value;
}
class Program
{
static void Main()
{
Test1();
Test2();
Test3();
Test4();
Test5();
}
static S1 Test1()
{
System.Console.Write(""1-"");
return (S1)10;
}
static S1 Test2()
{
System.Console.Write(""2-"");
return (S1)default;
}
static S1 Test3()
{
System.Console.Write(""3-"");
return (S1)default(S1);
}
static S1 Test4()
{
System.Console.Write(""4-"");
return (S1)null;
}
static S1 Test5()
{
System.Console.Write(""5-"");
return (S1)""11"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "1-int {10} 2-3-4-5-string {11}").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 18 (0x12)
.maxstack 1
IL_0000: ldstr ""1-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldc.i4.s 10
IL_000c: newobj ""S1..ctor(int)""
IL_0011: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 12 (0xc)
.maxstack 1
IL_0000: ldstr ""2-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldnull
IL_000b: ret
}
");
verifier.VerifyIL("Program.Test3", @"
{
// Code size 12 (0xc)
.maxstack 1
IL_0000: ldstr ""3-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldnull
IL_000b: ret
}
");
verifier.VerifyIL("Program.Test4", @"
{
// Code size 12 (0xc)
.maxstack 1
IL_0000: ldstr ""4-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldnull
IL_000b: ret
}
");
verifier.VerifyIL("Program.Test5", @"
{
// Code size 21 (0x15)
.maxstack 1
IL_0000: ldstr ""5-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldstr ""11""
IL_000f: newobj ""S1..ctor(string)""
IL_0014: ret
}
");
}
[Fact]
public void UnionConversion_05_No_Lifted_Form()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x)
{
_value = x;
}
public S1(string x)
{
_value = x;
}
public object Value => _value;
}
class Program
{
static S1 Test1(int? x)
{
#line 20
return x;
}
static S1? Test2(int? y)
{
return y;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (20,16): error CS0029: Cannot implicitly convert type 'int?' to 'S1'
// return x;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "x").WithArguments("int?", "S1").WithLocation(20, 16),
// (25,16): error CS0029: Cannot implicitly convert type 'int?' to 'S1?'
// return y;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "y").WithArguments("int?", "S1?").WithLocation(25, 16)
);
}
[Fact]
public void UnionConversion_06_No_Lifted_Form_Class()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x)
{
_value = x;
}
public S1(string x)
{
_value = x;
}
public object Value => _value;
}
class Program
{
static S1 Test1(int? x)
{
#line 20
return x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (20,16): error CS0029: Cannot implicitly convert type 'int?' to 'S1'
// return x;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "x").WithArguments("int?", "S1").WithLocation(20, 16)
);
}
[Fact]
public void UnionConversion_07_Ambiguity_First_Declared_Wins()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
public struct S1
{
private readonly object _value;
public S1(C1 x)
{
System.Console.Write(""C1"");
_value = x;
}
public S1(C2 x) => throw null;
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
public struct S2
{
private readonly object _value;
public S2(C2 x)
{
System.Console.Write(""C2"");
_value = x;
}
public S2(C1 x) => throw null;
public object Value => _value;
}
public class C1 { }
public class C2 { }
";
var src2 = @"
class Program
{
static void Main()
{
Test1();
Test2();
}
static S1 Test1()
{
return null;
}
static S2 Test2()
{
return null;
}
}
";
var comp = CreateCompilation([src1, src2, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "C1C2").VerifyDiagnostics();
comp = CreateCompilation(src2, references: [comp.EmitToImageReference()], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "C1C2").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_08_Standard_Conversion_For_Source_Allowed()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(string x) => throw null;
public object Value => _value;
}
class Program
{
static void Main()
{
Test1(15);
Test2(16);
}
static S1 Test1(byte x1)
{
return x1;
}
static S1 Test2(byte x2)
{
return (S1)x2;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "int {15} int {16}").VerifyDiagnostics();
var tree = comp.SyntaxTrees.First();
var model = comp.GetSemanticModel(tree);
var x1 = GetSyntax<IdentifierNameSyntax>(tree, "x1");
var symbolInfo = model.GetSymbolInfo(x1);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
AssertEx.Equal("System.Byte x1", symbolInfo.Symbol.ToTestDisplayString());
Assert.Empty(symbolInfo.CandidateSymbols);
var typeInfo = model.GetTypeInfo(x1);
Assert.Equal("System.Byte", typeInfo.Type.ToTestDisplayString());
Assert.Equal("S1", typeInfo.ConvertedType.ToTestDisplayString());
Conversion conversion = model.GetConversion(x1);
Assert.True(conversion.IsUnion);
Assert.False(conversion.IsUserDefined);
AssertEx.Equal("S1..ctor(System.Int32 x)", conversion.Method.ToTestDisplayString());
Assert.Null(conversion.BestUserDefinedConversionAnalysis);
Assert.Equal(Conversion.NoConversion, conversion.UserDefinedFromConversion);
Assert.Equal(Conversion.NoConversion, conversion.UserDefinedToConversion);
Assert.NotNull(conversion.BestUnionConversionAnalysis);
Assert.Empty(conversion.OriginalUserDefinedConversions);
Assert.True(conversion.UnderlyingConversions.IsDefault);
CommonConversion commonConversion = conversion.ToCommonConversion();
Assert.True(commonConversion.Exists);
Assert.True(commonConversion.IsImplicit);
Assert.True(commonConversion.IsUnion);
Assert.False(commonConversion.IsUserDefined);
AssertEx.Equal("S1..ctor(System.Int32 x)", commonConversion.MethodSymbol.ToTestDisplayString());
VerifyOperationTreeForNode(comp, model, GetSyntax<ReturnStatementSyntax>(tree, "return x1;"), """
IReturnOperation (OperationKind.Return, Type: null) (Syntax: 'return x1;')
ReturnedValue:
IConversionOperation (TryCast: False, Unchecked) (OperatorMethod: S1..ctor(System.Int32 x)) (OperationKind.Conversion, Type: S1, IsImplicit) (Syntax: 'x1')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False, IsUnion: True) (MethodSymbol: S1..ctor(System.Int32 x))
Operand:
IConversionOperation (TryCast: False, Unchecked) (OperationKind.Conversion, Type: System.Int32, IsImplicit) (Syntax: 'x1')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
Operand:
IParameterReferenceOperation: x1 (OperationKind.ParameterReference, Type: System.Byte) (Syntax: 'x1')
""");
var x2 = GetSyntax<IdentifierNameSyntax>(tree, "x2");
symbolInfo = model.GetSymbolInfo(x2);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
AssertEx.Equal("System.Byte x2", symbolInfo.Symbol.ToTestDisplayString());
Assert.Empty(symbolInfo.CandidateSymbols);
typeInfo = model.GetTypeInfo(x2);
Assert.Equal("System.Byte", typeInfo.Type.ToTestDisplayString());
Assert.Equal("System.Byte", typeInfo.ConvertedType.ToTestDisplayString());
conversion = model.GetConversion(x2);
Assert.True(conversion.IsIdentity);
Assert.False(conversion.IsUnion);
Assert.False(conversion.IsUserDefined);
var cast = GetSyntax<CastExpressionSyntax>(tree, "(S1)x2");
symbolInfo = model.GetSymbolInfo(cast);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
AssertEx.Equal("S1..ctor(System.Int32 x)", symbolInfo.Symbol.ToTestDisplayString());
Assert.Empty(symbolInfo.CandidateSymbols);
typeInfo = model.GetTypeInfo(cast);
Assert.Equal("S1", typeInfo.Type.ToTestDisplayString());
Assert.Equal("S1", typeInfo.ConvertedType.ToTestDisplayString());
VerifyOperationTreeForNode(comp, model, GetSyntax<ReturnStatementSyntax>(tree, "return (S1)x2;"), """
IReturnOperation (OperationKind.Return, Type: null) (Syntax: 'return (S1)x2;')
ReturnedValue:
IConversionOperation (TryCast: False, Unchecked) (OperatorMethod: S1..ctor(System.Int32 x)) (OperationKind.Conversion, Type: S1) (Syntax: '(S1)x2')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False, IsUnion: True) (MethodSymbol: S1..ctor(System.Int32 x))
Operand:
IConversionOperation (TryCast: False, Unchecked) (OperationKind.Conversion, Type: System.Int32, IsImplicit) (Syntax: '(S1)x2')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
Operand:
IParameterReferenceOperation: x2 (OperationKind.ParameterReference, Type: System.Byte) (Syntax: 'x2')
""");
}
[Fact]
public void UnionConversion_09_NonStandard_Conversion_For_Source_Not_Allowed()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(C1 x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
}
class C1
{
public static implicit operator C1(byte x) => new C1();
}
class Program
{
static S1 Test1(byte x)
{
#line 100
return x;
}
static S1 Test2(byte x)
{
#line 200
return (S1)x;
}
static C1 Test3(byte x)
{
return x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,16): error CS0029: Cannot implicitly convert type 'byte' to 'S1'
// return x;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "x").WithArguments("byte", "S1").WithLocation(100, 16),
// (200,16): error CS0030: Cannot convert type 'byte' to 'S1'
// return (S1)x;
Diagnostic(ErrorCode.ERR_NoExplicitConv, "(S1)x").WithArguments("byte", "S1").WithLocation(200, 16)
);
}
[Fact]
public void UnionConversion_10_Explicit_Conversion_For_Source_Not_Allowed()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static S1 Test1(long x)
{
#line 100
return x;
}
static S1 Test2(long x)
{
#line 200
return (S1)x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,16): error CS0029: Cannot implicitly convert type 'long' to 'S1'
// return x;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "x").WithArguments("long", "S1").WithLocation(100, 16),
// (200,16): error CS0030: Cannot convert type 'long' to 'S1'
// return (S1)x;
Diagnostic(ErrorCode.ERR_NoExplicitConv, "(S1)x").WithArguments("long", "S1").WithLocation(200, 16)
);
}
[Fact]
public void UnionConversion_11_Not_Standard_Conversion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(S2 x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(int x) => throw null;
public S2(string x) => throw null;
public object Value => throw null;
}
class C1
{
public static implicit operator C1(S2 x) => new C1();
}
class Program
{
static S1 Test1(int x)
{
#line 100
return x;
}
static C1 Test2(int x)
{
#line 200
return x;
}
static S1 Test3(int x)
{
#line 300
return (S2)x;
}
static C1 Test4(int x)
{
#line 400
return (S2)x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,16): error CS0029: Cannot implicitly convert type 'int' to 'S1'
// return x;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "x").WithArguments("int", "S1").WithLocation(100, 16),
// (200,16): error CS0029: Cannot implicitly convert type 'int' to 'C1'
// return x;
Diagnostic(ErrorCode.ERR_NoImplicitConv, "x").WithArguments("int", "C1").WithLocation(200, 16)
);
}
[Fact]
public void UnionConversion_12_Implicit_UserDefined_Conversion_Wins()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null;
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public object Value => throw null;
public static implicit operator S1(int x)
{
System.Console.Write(""implicit operator "");
return new S1(x.ToString());
}
}
class Program
{
static void Main()
{
Test1();
Test2();
}
static S1 Test1()
{
return 10;
}
static S1 Test2()
{
return (S1)20;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "implicit operator string {10} implicit operator string {20}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_13_Cast_Explicit_UserDefined_Conversion_Wins()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null;
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public object Value => throw null;
public static explicit operator S1(int x)
{
System.Console.Write(""explicit operator "");
return new S1(x.ToString());
}
}
class Program
{
static void Main()
{
Test2();
}
static S1 Test2()
{
return (S1)20;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "explicit operator string {20}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_14_Explicit_UserDefined_Conversion_Loses()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public S1(string x) => throw null;
public object Value => throw null;
public static explicit operator S1(int x) => throw null;
}
class Program
{
static void Main()
{
Test1();
}
static S1 Test1()
{
return 10;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "int {10}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_15_Cast_From_Base_Class_Not_Union_Conversion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(System.ValueType x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1()));
}
static S1 Test2(System.ValueType x)
{
return (S1)x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "S1").VerifyDiagnostics();
verifier.VerifyIL("Program.Test2", @"
{
// Code size 7 (0x7)
.maxstack 1
IL_0000: ldarg.0
IL_0001: unbox.any ""S1""
IL_0006: ret
}
");
}
[Fact]
public void UnionConversion_16_Implicit_From_Base_Class_Union_Conversion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(System.ValueType x)
{
System.Console.Write(""System.ValueType "");
}
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1()));
}
static S1 Test2(System.ValueType x)
{
return x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "System.ValueType S1").VerifyDiagnostics();
verifier.VerifyIL("Program.Test2", @"
{
// Code size 7 (0x7)
.maxstack 1
IL_0000: ldarg.0
IL_0001: newobj ""S1..ctor(System.ValueType)""
IL_0006: ret
}
");
var src2 = @"
struct S1
{
public static implicit operator S1(System.ValueType x)
=> throw null;
}
struct S2
{
public static explicit operator S2(System.ValueType x)
=> throw null;
}
";
CreateCompilation(src2).VerifyDiagnostics(
// (4,37): error CS0553: 'S1.implicit operator S1(ValueType)': user-defined conversions to or from a base type are not allowed
// public static implicit operator S1(System.ValueType x)
Diagnostic(ErrorCode.ERR_ConversionWithBase, "S1").WithArguments("S1.implicit operator S1(System.ValueType)").WithLocation(4, 37),
// (9,37): error CS0553: 'S2.explicit operator S2(ValueType)': user-defined conversions to or from a base type are not allowed
// public static explicit operator S2(System.ValueType x)
Diagnostic(ErrorCode.ERR_ConversionWithBase, "S2").WithArguments("S2.explicit operator S2(System.ValueType)").WithLocation(9, 37)
);
}
[Fact]
public void UnionConversion_17_Cast_From_Implemented_Interface_Not_Union_Conversion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1 : I1
{
public S1(I1 x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
}
interface I1 { }
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1()));
}
static S1 Test2(I1 x)
{
return (S1)x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "S1").VerifyDiagnostics();
verifier.VerifyIL("Program.Test2", @"
{
// Code size 7 (0x7)
.maxstack 1
IL_0000: ldarg.0
IL_0001: unbox.any ""S1""
IL_0006: ret
}
");
}
[Fact]
public void UnionConversion_18_Implicit_From_Implemented_Interface_Union_Conversion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1 : I1
{
public S1(I1 x)
{
System.Console.Write(""I1 "");
}
public S1(string x) => throw null;
public object Value => throw null;
}
interface I1 { }
class Program
{
static void Main()
{
System.Console.Write(Test2(new S1()));
}
static S1 Test2(I1 x)
{
return x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "I1 S1").VerifyDiagnostics();
verifier.VerifyIL("Program.Test2", @"
{
// Code size 7 (0x7)
.maxstack 1
IL_0000: ldarg.0
IL_0001: newobj ""S1..ctor(I1)""
IL_0006: ret
}
");
var src2 = @"
interface I1 { }
struct S1 : I1
{
public static implicit operator S1(I1 x)
=> throw null;
}
struct S2 : I1
{
public static explicit operator S2(I1 x)
=> throw null;
}
";
CreateCompilation(src2).VerifyDiagnostics(
// (6,37): error CS0552: 'S1.implicit operator S1(I1)': user-defined conversions to or from an interface are not allowed
// public static implicit operator S1(I1 x)
Diagnostic(ErrorCode.ERR_ConversionWithInterface, "S1").WithArguments("S1.implicit operator S1(I1)").WithLocation(6, 37),
// (11,37): error CS0552: 'S2.explicit operator S2(I1)': user-defined conversions to or from an interface are not allowed
// public static explicit operator S2(I1 x)
Diagnostic(ErrorCode.ERR_ConversionWithInterface, "S2").WithArguments("S2.explicit operator S2(I1)").WithLocation(11, 37)
);
}
[Fact]
public void UnionConversion_19_From_Not_Implemented_Interface_Union_Conversion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(I1 x)
{
System.Console.Write(""I1 "");
}
public S1(string x) => throw null;
public object Value => throw null;
}
interface I1 { }
struct S2 : I1;
class Program
{
static void Main()
{
System.Console.Write(Test1(new S2()));
System.Console.Write(' ');
System.Console.Write(Test2(new S2()));
}
static S1 Test1(I1 x)
{
return x;
}
static S1 Test2(I1 x)
{
return (S1)x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "I1 S1 I1 S1").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 7 (0x7)
.maxstack 1
IL_0000: ldarg.0
IL_0001: newobj ""S1..ctor(I1)""
IL_0006: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 7 (0x7)
.maxstack 1
IL_0000: ldarg.0
IL_0001: newobj ""S1..ctor(I1)""
IL_0006: ret
}
");
var src2 = @"
interface I1 { }
struct S1
{
public static implicit operator S1(I1 x)
=> throw null;
}
struct S2
{
public static explicit operator S2(I1 x)
=> throw null;
}
";
CreateCompilation(src2).VerifyDiagnostics(
// (6,37): error CS0552: 'S1.implicit operator S1(I1)': user-defined conversions to or from an interface are not allowed
// public static implicit operator S1(I1 x)
Diagnostic(ErrorCode.ERR_ConversionWithInterface, "S1").WithArguments("S1.implicit operator S1(I1)").WithLocation(6, 37),
// (11,37): error CS0552: 'S2.explicit operator S2(I1)': user-defined conversions to or from an interface are not allowed
// public static explicit operator S2(I1 x)
Diagnostic(ErrorCode.ERR_ConversionWithInterface, "S2").WithArguments("S2.explicit operator S2(I1)").WithLocation(11, 37)
);
}
[Fact]
public void UnionConversion_20_From_Not_Implemented_Interface_Union_Conversion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
public S1(I1 x)
{
System.Console.Write(""I1 "");
}
public S1(string x) => throw null;
public object Value => throw null;
}
interface I1 { }
struct S2 : I1;
class Program
{
static void Main()
{
System.Console.Write(Test1(new S2()));
}
static S1 Test1(I1 x)
{
return x;
}
static S1 Test2(I1 x)
{
return (S1)x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "I1 S1").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 7 (0x7)
.maxstack 1
IL_0000: ldarg.0
IL_0001: newobj ""S1..ctor(I1)""
IL_0006: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 7 (0x7)
.maxstack 1
IL_0000: ldarg.0
IL_0001: castclass ""S1""
IL_0006: ret
}
");
var src2 = @"
interface I1 { }
class S1
{
public static implicit operator S1(I1 x)
=> throw null;
}
class S2
{
public static explicit operator S2(I1 x)
=> throw null;
}
";
CreateCompilation(src2).VerifyDiagnostics(
// (6,37): error CS0552: 'S1.implicit operator S1(I1)': user-defined conversions to or from an interface are not allowed
// public static implicit operator S1(I1 x)
Diagnostic(ErrorCode.ERR_ConversionWithInterface, "S1").WithArguments("S1.implicit operator S1(I1)").WithLocation(6, 37),
// (11,37): error CS0552: 'S2.explicit operator S2(I1)': user-defined conversions to or from an interface are not allowed
// public static explicit operator S2(I1 x)
Diagnostic(ErrorCode.ERR_ConversionWithInterface, "S2").WithArguments("S2.explicit operator S2(I1)").WithLocation(11, 37)
);
}
[Fact]
public void UnionConversion_21_Through_Base_Class_Or_Interface()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(System.ValueType x)
{
System.Console.Write(""System.ValueType {"");
System.Console.Write(x.GetType());
System.Console.Write(' ');
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(System.IComparable x)
{
System.Console.Write(""System.IComparable {"");
System.Console.Write(x.GetType());
System.Console.Write(' ');
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object Value => _value;
}
class Program
{
static void Main()
{
Test1();
Test5();
}
static S1 Test1()
{
System.Console.Write(""1-"");
return 10;
}
static S1 Test5()
{
System.Console.Write(""5-"");
return ""11"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "1-System.ValueType {System.Int32 10} 5-System.IComparable {System.String 11}").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 23 (0x17)
.maxstack 1
IL_0000: ldstr ""1-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldc.i4.s 10
IL_000c: box ""int""
IL_0011: newobj ""S1..ctor(System.ValueType)""
IL_0016: ret
}
");
verifier.VerifyIL("Program.Test5", @"
{
// Code size 21 (0x15)
.maxstack 1
IL_0000: ldstr ""5-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldstr ""11""
IL_000f: newobj ""S1..ctor(System.IComparable)""
IL_0014: ret
}
");
}
[Fact]
public void UnionConversion_22_ExpressionTree()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static System.Linq.Expressions.Expression<System.Func<S1>> Test1(int x)
{
#line 13
return () => x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (13,22): error CS9369: An expression tree may not contain a union conversion.
// return () => x;
Diagnostic(ErrorCode.ERR_ExpressionTreeContainsUnionConversion, "x").WithLocation(13, 22)
);
}
[Fact]
public void UnionConversion_23_ClassifyImplicitConversionFromType()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static void Main()
{
Test1(10);
}
static S1 Test1(int? x)
{
return x ?? new S1("""");
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "int {10}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_24_ClassifyConversionFromType()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static void Main()
{
var x = new S1();
var y = (0, 123);
(var z, x) = y;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "int {123}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_25_ClassifyConversionFromTypeForCast_Implicit_UserDefined_Conversion_Wins()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null;
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public object Value => throw null;
public static implicit operator S1(int x)
{
System.Console.Write(""implicit operator "");
return new S1(x.ToString());
}
}
class Program
{
static void Main()
{
Test1();
}
static void Test1()
{
foreach (S1 y in new int[] { 10 })
{
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "implicit operator string {10}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_26_ClassifyConversionFromTypeForCast_Explicit_UserDefined_Conversion_Wins()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null;
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public object Value => throw null;
public static explicit operator S1(int x)
{
System.Console.Write(""explicit operator "");
return new S1(x.ToString());
}
}
class Program
{
static void Main()
{
Test2();
}
static void Test2()
{
foreach (S1 y in new int[] { 20 })
{
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "explicit operator string {20}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_27_ClassifyConversionFromTypeForCast()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static void Main()
{
Test1();
}
static void Test1()
{
foreach (S1 y in new int[] { 10 })
{
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "int {10}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_28_Under_Tuple_Conversion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(double x)
{
System.Console.Write(""double {"");
System.Console.Write((int)x);
System.Console.Write(""} "");
}
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static void Main()
{
Test1((0, 10));
}
static (int, S1) Test1((int, byte) x)
{
return x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "double {10}").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 26 (0x1a)
.maxstack 2
.locals init (System.ValueTuple<int, byte> V_0)
IL_0000: ldarg.0
IL_0001: stloc.0
IL_0002: ldloc.0
IL_0003: ldfld ""int System.ValueTuple<int, byte>.Item1""
IL_0008: ldloc.0
IL_0009: ldfld ""byte System.ValueTuple<int, byte>.Item2""
IL_000e: conv.r8
IL_000f: newobj ""S1..ctor(double)""
IL_0014: newobj ""System.ValueTuple<int, S1>..ctor(int, S1)""
IL_0019: ret
}
");
}
[Fact]
public void UnionConversion_30_In_Parameter()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(in int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static void Main()
{
Test1();
Test2(11);
Test3(12);
}
static S1 Test1()
{
System.Console.Write(""1-"");
return 10;
}
static S1 Test2(int x)
{
System.Console.Write(""2-"");
return x;
}
static S1 Test3(byte x)
{
System.Console.Write(""3-"");
return x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "1-int {10} 2-int {11} 3-int {12}").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 21 (0x15)
.maxstack 1
.locals init (int V_0)
IL_0000: ldstr ""1-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldc.i4.s 10
IL_000c: stloc.0
IL_000d: ldloca.s V_0
IL_000f: newobj ""S1..ctor(in int)""
IL_0014: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 18 (0x12)
.maxstack 1
IL_0000: ldstr ""2-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldarga.s V_0
IL_000c: newobj ""S1..ctor(in int)""
IL_0011: ret
}
");
verifier.VerifyIL("Program.Test3", @"
{
// Code size 20 (0x14)
.maxstack 1
.locals init (int V_0)
IL_0000: ldstr ""3-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldarg.0
IL_000b: stloc.0
IL_000c: ldloca.s V_0
IL_000e: newobj ""S1..ctor(in int)""
IL_0013: ret
}
");
}
[Fact]
public void UnionConversion_31_Ambiguity_In_Vs_Val_First_Declared_Wins()
{
var src1 = @"
[System.Runtime.CompilerServices.Union]
public struct S1
{
public S1(in int x)
{
System.Console.Write(""In"");
}
public S1(int x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
}
[System.Runtime.CompilerServices.Union]
public struct S2
{
public S2(int x)
{
System.Console.Write(""Val"");
}
public S2(in int x) => throw null;
public S2(string x) => throw null;
public object Value => throw null;
}
";
var src2 = @"
class Program
{
static void Main()
{
Test1();
Test2();
}
static S1 Test1()
{
return 10;
}
static S2 Test2()
{
return 10;
}
}
";
var comp = CreateCompilation([src1, src2, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "InVal").VerifyDiagnostics();
comp = CreateCompilation(src2, references: [comp.EmitToImageReference()], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "InVal").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_32_No_Params_Expansion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(params int[] x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static S1 Test1(int x)
{
#line 13
return (S1)x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (13,16): error CS0030: Cannot convert type 'int' to 'S1'
// return (S1)x;
Diagnostic(ErrorCode.ERR_NoExplicitConv, "(S1)x").WithArguments("int", "S1").WithLocation(13, 16)
);
}
[Fact]
public void UnionConversion_33_No_Optional()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(byte x) => throw null;
public S1(string x) => throw null;
public S1(int x, object o = null) => throw null;
public object Value => throw null;
}
class Program
{
static S1 Test1(int x)
{
#line 14
return (S1)x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (14,16): error CS0030: Cannot convert type 'int' to 'S1'
// return (S1)x;
Diagnostic(ErrorCode.ERR_NoExplicitConv, "(S1)x").WithArguments("int", "S1").WithLocation(14, 16)
);
}
[Fact]
public void UnionConversion_34_No_Non_Public()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(byte x) => throw null;
public S1(string x) => throw null;
internal S1(int x) => throw null;
public object Value => throw null;
}
class Program
{
static S1 Test1(int x)
{
#line 14
return (S1)x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (14,16): error CS0030: Cannot convert type 'int' to 'S1'
// return (S1)x;
Diagnostic(ErrorCode.ERR_NoExplicitConv, "(S1)x").WithArguments("int", "S1").WithLocation(14, 16)
);
}
[Theory]
[CombinatorialData]
public void UnionConversion_35_No_Ref_Out([CombinatorialValues("ref", "out", "ref readonly")] string refModifier)
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(" + refModifier + @" int x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static S1 Test1(int x)
{
#line 13
return (S1)x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (13,16): error CS0030: Cannot convert type 'int' to 'S1'
// return (S1)x;
Diagnostic(ErrorCode.ERR_NoExplicitConv, "(S1)x").WithArguments("int", "S1").WithLocation(13, 16)
);
}
[Fact]
public void UnionConversion_36_Implicit_ToNullableOfUnion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1().HasValue ? ""[not null] "" : ""null "");
System.Console.Write(Test2().HasValue ? ""[not null] "" : ""null "");
System.Console.Write(Test3().HasValue ? ""[not null] "" : ""null "");
System.Console.Write(Test4().HasValue ? ""[not null] "" : ""null "");
System.Console.Write(Test5().HasValue ? ""[not null] "" : ""null "");
}
static S1? Test1()
{
System.Console.Write(""1-"");
/*<bind>*/ return 10; /*</bind>*/
}
static S1? Test2()
{
System.Console.Write(""2-"");
return default;
}
static S1? Test3()
{
System.Console.Write(""3-"");
return default(S1);
}
static S1? Test4()
{
System.Console.Write(""4-"");
return null;
}
static S1? Test5()
{
System.Console.Write(""5-"");
return ""11"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var tree = comp.SyntaxTrees.First();
var model = comp.GetSemanticModel(tree);
var ten = GetSyntax<LiteralExpressionSyntax>(tree, "10");
var symbolInfo = model.GetSymbolInfo(ten);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
Assert.Null(symbolInfo.Symbol);
Assert.Empty(symbolInfo.CandidateSymbols);
var typeInfo = model.GetTypeInfo(ten);
Assert.Equal("System.Int32", typeInfo.Type.ToTestDisplayString());
Assert.Equal("S1?", typeInfo.ConvertedType.ToTestDisplayString());
Conversion conversion = model.GetConversion(ten);
Assert.True(conversion.Exists);
Assert.True(conversion.IsValid);
Assert.True(conversion.IsImplicit);
Assert.False(conversion.IsExplicit);
Assert.Equal(ConversionKind.Union, conversion.Kind);
Assert.Equal(LookupResultKind.Viable, conversion.ResultKind);
Assert.True(conversion.IsUnion);
Assert.False(conversion.IsUserDefined);
AssertEx.Equal("S1..ctor(System.Int32 x)", conversion.Method.ToTestDisplayString());
AssertEx.Equal("S1..ctor(System.Int32 x)", conversion.MethodSymbol.ToTestDisplayString());
Assert.Null(conversion.BestUserDefinedConversionAnalysis);
Assert.Equal(Conversion.NoConversion, conversion.UserDefinedFromConversion);
Assert.Equal(Conversion.NoConversion, conversion.UserDefinedToConversion);
Assert.NotNull(conversion.BestUnionConversionAnalysis);
Assert.Empty(conversion.OriginalUserDefinedConversions);
Assert.True(conversion.UnderlyingConversions.IsDefault);
Assert.False(conversion.IsArrayIndex);
Assert.False(conversion.IsExtensionMethod);
CommonConversion commonConversion = conversion.ToCommonConversion();
Assert.True(commonConversion.Exists);
Assert.True(commonConversion.IsImplicit);
Assert.True(commonConversion.IsUnion);
Assert.False(commonConversion.IsUserDefined);
AssertEx.Equal("S1..ctor(System.Int32 x)", commonConversion.MethodSymbol.ToTestDisplayString());
VerifyOperationTreeForTest<ReturnStatementSyntax>(comp, """
IReturnOperation (OperationKind.Return, Type: null) (Syntax: 'return 10;')
ReturnedValue:
IConversionOperation (TryCast: False, Unchecked) (OperationKind.Conversion, Type: S1?, IsImplicit) (Syntax: '10')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
Operand:
IConversionOperation (TryCast: False, Unchecked) (OperatorMethod: S1..ctor(System.Int32 x)) (OperationKind.Conversion, Type: S1, IsImplicit) (Syntax: '10')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False, IsUnion: True) (MethodSymbol: S1..ctor(System.Int32 x))
Operand:
ILiteralOperation (OperationKind.Literal, Type: System.Int32, Constant: 10) (Syntax: '10')
""");
var verifier = CompileAndVerify(comp, expectedOutput: "1-int {10} [not null] 2-null 3-[not null] 4-null 5-string {11} [not null]").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 23 (0x17)
.maxstack 1
IL_0000: ldstr ""1-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldc.i4.s 10
IL_000c: newobj ""S1..ctor(int)""
IL_0011: newobj ""S1?..ctor(S1)""
IL_0016: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 20 (0x14)
.maxstack 1
.locals init (S1? V_0)
IL_0000: ldstr ""2-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""S1?""
IL_0012: ldloc.0
IL_0013: ret
}
");
verifier.VerifyIL("Program.Test3", @"
{
// Code size 25 (0x19)
.maxstack 1
.locals init (S1 V_0)
IL_0000: ldstr ""3-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""S1""
IL_0012: ldloc.0
IL_0013: newobj ""S1?..ctor(S1)""
IL_0018: ret
}
");
verifier.VerifyIL("Program.Test4", @"
{
// Code size 20 (0x14)
.maxstack 1
.locals init (S1? V_0)
IL_0000: ldstr ""4-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""S1?""
IL_0012: ldloc.0
IL_0013: ret
}
");
verifier.VerifyIL("Program.Test5", @"
{
// Code size 26 (0x1a)
.maxstack 1
IL_0000: ldstr ""5-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldstr ""11""
IL_000f: newobj ""S1..ctor(string)""
IL_0014: newobj ""S1?..ctor(S1)""
IL_0019: ret
}
");
}
[Fact]
public void UnionConversion_37_Cast_ToNullableOfUnion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1().HasValue ? ""[not null] "" : ""null "");
System.Console.Write(Test2().HasValue ? ""[not null] "" : ""null "");
System.Console.Write(Test3().HasValue ? ""[not null] "" : ""null "");
System.Console.Write(Test4().HasValue ? ""[not null] "" : ""null "");
System.Console.Write(Test5().HasValue ? ""[not null] "" : ""null "");
}
static S1? Test1()
{
System.Console.Write(""1-"");
return /*<bind>*/ (S1?)10 /*</bind>*/;
}
static S1? Test2()
{
System.Console.Write(""2-"");
return (S1?)default;
}
static S1? Test3()
{
System.Console.Write(""3-"");
return (S1?)default(S1);
}
static S1? Test4()
{
System.Console.Write(""4-"");
return (S1?)null;
}
static S1? Test5()
{
System.Console.Write(""5-"");
return (S1?)""11"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var tree = comp.SyntaxTrees.First();
var model = comp.GetSemanticModel(tree);
var cast = GetSyntax<CastExpressionSyntax>(tree, "(S1?)10");
var typeInfo = model.GetTypeInfo(cast);
Assert.Equal("S1?", typeInfo.Type.ToTestDisplayString());
Assert.Equal("S1?", typeInfo.ConvertedType.ToTestDisplayString());
Conversion conversion = model.GetConversion(cast);
Assert.True(conversion.IsIdentity);
var symbolInfo = model.GetSymbolInfo(cast);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
AssertEx.Equal("S1..ctor(System.Int32 x)", symbolInfo.Symbol.ToTestDisplayString());
Assert.Empty(symbolInfo.CandidateSymbols);
VerifyOperationTreeForTest<CastExpressionSyntax>(comp, """
IConversionOperation (TryCast: False, Unchecked) (OperationKind.Conversion, Type: S1?) (Syntax: '(S1?)10')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
Operand:
IConversionOperation (TryCast: False, Unchecked) (OperatorMethod: S1..ctor(System.Int32 x)) (OperationKind.Conversion, Type: S1, IsImplicit) (Syntax: '(S1?)10')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False, IsUnion: True) (MethodSymbol: S1..ctor(System.Int32 x))
Operand:
ILiteralOperation (OperationKind.Literal, Type: System.Int32, Constant: 10) (Syntax: '10')
""");
var ten = GetSyntax<LiteralExpressionSyntax>(tree, "10");
typeInfo = model.GetTypeInfo(ten);
Assert.Equal("System.Int32", typeInfo.Type.ToTestDisplayString());
Assert.Equal("System.Int32", typeInfo.ConvertedType.ToTestDisplayString());
conversion = model.GetConversion(ten);
Assert.True(conversion.IsIdentity);
var verifier = CompileAndVerify(comp, expectedOutput: "1-int {10} [not null] 2-null 3-[not null] 4-null 5-string {11} [not null]").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 23 (0x17)
.maxstack 1
IL_0000: ldstr ""1-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldc.i4.s 10
IL_000c: newobj ""S1..ctor(int)""
IL_0011: newobj ""S1?..ctor(S1)""
IL_0016: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 20 (0x14)
.maxstack 1
.locals init (S1? V_0)
IL_0000: ldstr ""2-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""S1?""
IL_0012: ldloc.0
IL_0013: ret
}
");
verifier.VerifyIL("Program.Test3", @"
{
// Code size 25 (0x19)
.maxstack 1
.locals init (S1 V_0)
IL_0000: ldstr ""3-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""S1""
IL_0012: ldloc.0
IL_0013: newobj ""S1?..ctor(S1)""
IL_0018: ret
}
");
verifier.VerifyIL("Program.Test4", @"
{
// Code size 20 (0x14)
.maxstack 1
.locals init (S1? V_0)
IL_0000: ldstr ""4-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""S1?""
IL_0012: ldloc.0
IL_0013: ret
}
");
verifier.VerifyIL("Program.Test5", @"
{
// Code size 26 (0x1a)
.maxstack 1
IL_0000: ldstr ""5-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldstr ""11""
IL_000f: newobj ""S1..ctor(string)""
IL_0014: newobj ""S1?..ctor(S1)""
IL_0019: ret
}
");
}
[Fact]
public void UnionConversion_38_Standard_Conversion_For_Source_Allowed_ToNullableOfUnion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(string x) => throw null;
public object Value => _value;
}
class Program
{
static void Main()
{
Test1(15);
Test2(16);
}
static S1? Test1(byte x1)
{
return x1;
}
static S1? Test2(byte x2)
{
return (S1?)x2;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "int {15} int {16}").VerifyDiagnostics();
var tree = comp.SyntaxTrees.First();
var model = comp.GetSemanticModel(tree);
var x1 = GetSyntax<IdentifierNameSyntax>(tree, "x1");
var symbolInfo = model.GetSymbolInfo(x1);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
AssertEx.Equal("System.Byte x1", symbolInfo.Symbol.ToTestDisplayString());
Assert.Empty(symbolInfo.CandidateSymbols);
var typeInfo = model.GetTypeInfo(x1);
Assert.Equal("System.Byte", typeInfo.Type.ToTestDisplayString());
Assert.Equal("S1?", typeInfo.ConvertedType.ToTestDisplayString());
Conversion conversion = model.GetConversion(x1);
Assert.True(conversion.IsUnion);
Assert.False(conversion.IsUserDefined);
AssertEx.Equal("S1..ctor(System.Int32 x)", conversion.Method.ToTestDisplayString());
Assert.Null(conversion.BestUserDefinedConversionAnalysis);
Assert.Equal(Conversion.NoConversion, conversion.UserDefinedFromConversion);
Assert.Equal(Conversion.NoConversion, conversion.UserDefinedToConversion);
Assert.NotNull(conversion.BestUnionConversionAnalysis);
Assert.Empty(conversion.OriginalUserDefinedConversions);
Assert.True(conversion.UnderlyingConversions.IsDefault);
CommonConversion commonConversion = conversion.ToCommonConversion();
Assert.True(commonConversion.Exists);
Assert.True(commonConversion.IsImplicit);
Assert.True(commonConversion.IsUnion);
Assert.False(commonConversion.IsUserDefined);
AssertEx.Equal("S1..ctor(System.Int32 x)", commonConversion.MethodSymbol.ToTestDisplayString());
VerifyOperationTreeForNode(comp, model, GetSyntax<ReturnStatementSyntax>(tree, "return x1;"), """
IReturnOperation (OperationKind.Return, Type: null) (Syntax: 'return x1;')
ReturnedValue:
IConversionOperation (TryCast: False, Unchecked) (OperationKind.Conversion, Type: S1?, IsImplicit) (Syntax: 'x1')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
Operand:
IConversionOperation (TryCast: False, Unchecked) (OperatorMethod: S1..ctor(System.Int32 x)) (OperationKind.Conversion, Type: S1, IsImplicit) (Syntax: 'x1')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False, IsUnion: True) (MethodSymbol: S1..ctor(System.Int32 x))
Operand:
IConversionOperation (TryCast: False, Unchecked) (OperationKind.Conversion, Type: System.Int32, IsImplicit) (Syntax: 'x1')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
Operand:
IParameterReferenceOperation: x1 (OperationKind.ParameterReference, Type: System.Byte) (Syntax: 'x1')
""");
var x2 = GetSyntax<IdentifierNameSyntax>(tree, "x2");
symbolInfo = model.GetSymbolInfo(x2);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
AssertEx.Equal("System.Byte x2", symbolInfo.Symbol.ToTestDisplayString());
Assert.Empty(symbolInfo.CandidateSymbols);
typeInfo = model.GetTypeInfo(x2);
Assert.Equal("System.Byte", typeInfo.Type.ToTestDisplayString());
Assert.Equal("System.Byte", typeInfo.ConvertedType.ToTestDisplayString());
conversion = model.GetConversion(x2);
Assert.True(conversion.IsIdentity);
Assert.False(conversion.IsUnion);
Assert.False(conversion.IsUserDefined);
var cast = GetSyntax<CastExpressionSyntax>(tree, "(S1?)x2");
symbolInfo = model.GetSymbolInfo(cast);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
AssertEx.Equal("S1..ctor(System.Int32 x)", symbolInfo.Symbol.ToTestDisplayString());
Assert.Empty(symbolInfo.CandidateSymbols);
typeInfo = model.GetTypeInfo(cast);
Assert.Equal("S1?", typeInfo.Type.ToTestDisplayString());
Assert.Equal("S1?", typeInfo.ConvertedType.ToTestDisplayString());
VerifyOperationTreeForNode(comp, model, GetSyntax<ReturnStatementSyntax>(tree, "return (S1?)x2;"), """
IReturnOperation (OperationKind.Return, Type: null) (Syntax: 'return (S1?)x2;')
ReturnedValue:
IConversionOperation (TryCast: False, Unchecked) (OperationKind.Conversion, Type: S1?) (Syntax: '(S1?)x2')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
Operand:
IConversionOperation (TryCast: False, Unchecked) (OperatorMethod: S1..ctor(System.Int32 x)) (OperationKind.Conversion, Type: S1, IsImplicit) (Syntax: '(S1?)x2')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False, IsUnion: True) (MethodSymbol: S1..ctor(System.Int32 x))
Operand:
IConversionOperation (TryCast: False, Unchecked) (OperationKind.Conversion, Type: System.Int32, IsImplicit) (Syntax: '(S1?)x2')
Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: True, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
Operand:
IParameterReferenceOperation: x2 (OperationKind.ParameterReference, Type: System.Byte) (Syntax: 'x2')
""");
}
[Fact]
public void UnionConversion_39_Implicit_UserDefined_Conversion_Wins_ToNullableOfUnion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null;
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public object Value => throw null;
public static implicit operator S1(int x)
{
System.Console.Write(""implicit operator "");
return new S1(x.ToString());
}
}
class Program
{
static void Main()
{
Test1();
Test2();
}
static S1? Test1()
{
return 10;
}
static S1? Test2()
{
return (S1?)20;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "implicit operator string {10} implicit operator string {20}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_40_Cast_Explicit_UserDefined_Conversion_Wins_ToNullableOfUnion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null;
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public object Value => throw null;
public static explicit operator S1(int x)
{
System.Console.Write(""explicit operator "");
return new S1(x.ToString());
}
}
class Program
{
static void Main()
{
Test2();
}
static S1? Test2()
{
return (S1?)20;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "explicit operator string {20}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_41_Explicit_UserDefined_Conversion_Loses_ToNullableOfUnion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x)
{
System.Console.Write(""int {"");
System.Console.Write(x);
System.Console.Write(""} "");
}
public S1(string x) => throw null;
public object Value => throw null;
public static explicit operator S1(int x) => throw null;
}
class Program
{
static void Main()
{
Test1();
}
static S1? Test1()
{
return 10;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "int {10}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_42_Under_Tuple_Conversion_ToNullableOfUnion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(double x)
{
System.Console.Write(""double {"");
System.Console.Write((int)x);
System.Console.Write(""} "");
}
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static void Main()
{
Test1((0, 10));
}
static (int, S1?) Test1((int, byte) x)
{
return x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "double {10}").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 31 (0x1f)
.maxstack 2
.locals init (System.ValueTuple<int, byte> V_0)
IL_0000: ldarg.0
IL_0001: stloc.0
IL_0002: ldloc.0
IL_0003: ldfld ""int System.ValueTuple<int, byte>.Item1""
IL_0008: ldloc.0
IL_0009: ldfld ""byte System.ValueTuple<int, byte>.Item2""
IL_000e: conv.r8
IL_000f: newobj ""S1..ctor(double)""
IL_0014: newobj ""S1?..ctor(S1)""
IL_0019: newobj ""System.ValueTuple<int, S1?>..ctor(int, S1?)""
IL_001e: ret
}
");
}
[Fact]
public void UnionConversion_43_From_TupleLiteral()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1((int, object) x)
{
System.Console.Write(""(int, object) {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object Value => _value;
}
class Program
{
static void Main()
{
Test1();
}
static S1 Test1()
{
return (10, null);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var tree = comp.SyntaxTrees.First();
var model = comp.GetSemanticModel(tree);
var tuple = GetSyntax<TupleExpressionSyntax>(tree, "(10, null)");
var symbolInfo = model.GetSymbolInfo(tuple);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
Assert.Null(symbolInfo.Symbol);
Assert.Empty(symbolInfo.CandidateSymbols);
var typeInfo = model.GetTypeInfo(tuple);
Assert.Null(typeInfo.Type);
Assert.Equal("S1", typeInfo.ConvertedType.ToTestDisplayString());
Conversion conversion = model.GetConversion(tuple);
Assert.Equal(ConversionKind.Union, conversion.Kind);
Assert.Equal(LookupResultKind.Viable, conversion.ResultKind);
Assert.True(conversion.IsUnion);
AssertEx.Equal("S1..ctor((System.Int32, System.Object) x)", conversion.Method.ToTestDisplayString());
AssertEx.Equal("S1..ctor((System.Int32, System.Object) x)", conversion.MethodSymbol.ToTestDisplayString());
CommonConversion commonConversion = conversion.ToCommonConversion();
Assert.True(commonConversion.Exists);
Assert.True(commonConversion.IsImplicit);
Assert.True(commonConversion.IsUnion);
Assert.False(commonConversion.IsUserDefined);
AssertEx.Equal("S1..ctor((System.Int32, System.Object) x)", commonConversion.MethodSymbol.ToTestDisplayString());
CompileAndVerify(comp, expectedOutput: "(int, object) {(10, )}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_44_From_TupleLiteral()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1((int, object) x)
{
System.Console.Write(""(int, object) {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object Value => _value;
}
class Program
{
static void Main()
{
Test1();
}
static S1 Test1()
{
return ((byte)10, null);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var tree = comp.SyntaxTrees.First();
var model = comp.GetSemanticModel(tree);
var tuple = GetSyntax<TupleExpressionSyntax>(tree, "((byte)10, null)");
var symbolInfo = model.GetSymbolInfo(tuple);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
Assert.Null(symbolInfo.Symbol);
Assert.Empty(symbolInfo.CandidateSymbols);
var typeInfo = model.GetTypeInfo(tuple);
Assert.Null(typeInfo.Type);
Assert.Equal("S1", typeInfo.ConvertedType.ToTestDisplayString());
Conversion conversion = model.GetConversion(tuple);
Assert.Equal(ConversionKind.Union, conversion.Kind);
Assert.Equal(LookupResultKind.Viable, conversion.ResultKind);
Assert.True(conversion.IsUnion);
AssertEx.Equal("S1..ctor((System.Int32, System.Object) x)", conversion.Method.ToTestDisplayString());
AssertEx.Equal("S1..ctor((System.Int32, System.Object) x)", conversion.MethodSymbol.ToTestDisplayString());
CommonConversion commonConversion = conversion.ToCommonConversion();
Assert.True(commonConversion.Exists);
Assert.True(commonConversion.IsImplicit);
Assert.True(commonConversion.IsUnion);
Assert.False(commonConversion.IsUserDefined);
AssertEx.Equal("S1..ctor((System.Int32, System.Object) x)", commonConversion.MethodSymbol.ToTestDisplayString());
CompileAndVerify(comp, expectedOutput: "(int, object) {(10, )}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_45_From_TupleLiteral_ToNullableOfUnion()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1((int, object) x)
{
System.Console.Write(""(int, object) {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public S1(string x)
{
System.Console.Write(""string {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object Value => _value;
}
class Program
{
static void Main()
{
Test1();
}
static S1? Test1()
{
return ((byte)10, null);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var tree = comp.SyntaxTrees.First();
var model = comp.GetSemanticModel(tree);
var tuple = GetSyntax<TupleExpressionSyntax>(tree, "((byte)10, null)");
var symbolInfo = model.GetSymbolInfo(tuple);
Assert.Equal(CandidateReason.None, symbolInfo.CandidateReason);
Assert.Null(symbolInfo.Symbol);
Assert.Empty(symbolInfo.CandidateSymbols);
var typeInfo = model.GetTypeInfo(tuple);
Assert.Null(typeInfo.Type);
Assert.Equal("S1?", typeInfo.ConvertedType.ToTestDisplayString());
Conversion conversion = model.GetConversion(tuple);
Assert.Equal(ConversionKind.Union, conversion.Kind);
Assert.Equal(LookupResultKind.Viable, conversion.ResultKind);
Assert.True(conversion.IsUnion);
AssertEx.Equal("S1..ctor((System.Int32, System.Object) x)", conversion.Method.ToTestDisplayString());
AssertEx.Equal("S1..ctor((System.Int32, System.Object) x)", conversion.MethodSymbol.ToTestDisplayString());
CommonConversion commonConversion = conversion.ToCommonConversion();
Assert.True(commonConversion.Exists);
Assert.True(commonConversion.IsImplicit);
Assert.True(commonConversion.IsUnion);
Assert.False(commonConversion.IsUserDefined);
AssertEx.Equal("S1..ctor((System.Int32, System.Object) x)", commonConversion.MethodSymbol.ToTestDisplayString());
CompileAndVerify(comp, expectedOutput: "(int, object) {(10, )}").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_46_Implicit_Ambiguous_UserDefined_Conversion_Shadows()
{
var src = @"
[System.Runtime.CompilerServices.Union]
public struct S1
{
public S1(S2 x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
public static implicit operator S1(S2 x) => throw null;
}
public struct S2
{
public static implicit operator S1(S2 x) => throw null;
}
class Program
{
static S1 Test2(S2 x)
{
#line 20
return x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (20,16): error CS0457: Ambiguous user defined conversions 'S2.implicit operator S1(S2)' and 'S1.implicit operator S1(S2)' when converting from 'S2' to 'S1'
// return x;
Diagnostic(ErrorCode.ERR_AmbigUDConv, "x").WithArguments("S2.implicit operator S1(S2)", "S1.implicit operator S1(S2)", "S2", "S1").WithLocation(20, 16)
);
}
[Fact]
public void UnionConversion_47_Cast_Emplicit_Ambiguous_UserDefined_Conversion_Shadows()
{
var src = @"
[System.Runtime.CompilerServices.Union]
public struct S1
{
public S1(S2 x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
public static explicit operator S1(S2 x) => throw null;
}
public struct S2
{
public static explicit operator S1(S2 x) => throw null;
}
class Program
{
static S1 Test2(S2 x)
{
#line 20
return (S1)x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (20,16): error CS0457: Ambiguous user defined conversions 'S2.explicit operator S1(S2)' and 'S1.explicit operator S1(S2)' when converting from 'S2' to 'S1'
// return (S1)x;
Diagnostic(ErrorCode.ERR_AmbigUDConv, "(S1)x").WithArguments("S2.explicit operator S1(S2)", "S1.explicit operator S1(S2)", "S2", "S1").WithLocation(20, 16)
);
}
[Fact]
public void UnionConversion_48_Abstract_Union()
{
var src = @"
[System.Runtime.CompilerServices.Union]
public abstract class C1
{
public C1(int x) => throw null;
public C1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static C1 Test1(int x)
{
#line 13
return new C1(x);
}
static C1 Test2(int x)
{
return x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (13,16): error CS0144: Cannot create an instance of the abstract type or interface 'C1'
// return new C1(x);
Diagnostic(ErrorCode.ERR_NoNewAbstract, "new C1(x)").WithArguments("C1").WithLocation(13, 16),
// (18,16): error CS0144: Cannot create an instance of the abstract type or interface 'C1'
// return x;
Diagnostic(ErrorCode.ERR_NoNewAbstract, "x").WithArguments("C1").WithLocation(18, 16)
);
}
[Fact]
public void UnionConversion_49_From_Dynamic()
{
var src = @"
[System.Runtime.CompilerServices.Union]
public struct S1
{
public S1(int x) => throw null;
public S1(string x) => throw null;
public object Value => throw null;
}
class Program
{
static void Main()
{
try
{
Test1(1);
}
catch (Microsoft.CSharp.RuntimeBinder.RuntimeBinderException)
{
System.Console.WriteLine(""RuntimeBinderException caught"");
}
}
static S1 Test1(dynamic x)
{
return x;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.StandardAndCSharp, options: TestOptions.DebugExe);
// Conversion from dynamic is not a union conversion.
CompileAndVerify(comp, expectedOutput: "RuntimeBinderException caught").VerifyDiagnostics();
}
[Fact]
public void UnionConversion_50_NullableConstructorParameter()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int? x)
{
System.Console.Write(""int? {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object Value => _value;
}
class Program
{
static void Main()
{
Test1();
Test2();
}
static S1 Test1()
{
System.Console.Write(""1-"");
return (int?)null;
}
static S1 Test2()
{
System.Console.Write(""2-"");
return null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "1-int? {} 2-int? {}").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 25 (0x19)
.maxstack 1
.locals init (int? V_0)
IL_0000: ldstr ""1-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""int?""
IL_0012: ldloc.0
IL_0013: newobj ""S1..ctor(int?)""
IL_0018: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 25 (0x19)
.maxstack 1
.locals init (int? V_0)
IL_0000: ldstr ""2-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldloca.s V_0
IL_000c: initobj ""int?""
IL_0012: ldloc.0
IL_0013: newobj ""S1..ctor(int?)""
IL_0018: ret
}
");
}
[Fact]
public void UnionConversion_51_NullableConstructorParameter()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object? _value;
public S1(string? x)
{
System.Console.Write(""string? {"");
System.Console.Write(x);
System.Console.Write(""} "");
_value = x;
}
public object? Value => _value;
}
class Program
{
static void Main()
{
Test1();
Test2();
}
static S1 Test1()
{
System.Console.Write(""1-"");
return (string?)null;
}
static S1 Test2()
{
System.Console.Write(""2-"");
return null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "1-string? {} 2-string? {}").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 17 (0x11)
.maxstack 1
IL_0000: ldstr ""1-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldnull
IL_000b: newobj ""S1..ctor(string)""
IL_0010: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 17 (0x11)
.maxstack 1
IL_0000: ldstr ""2-""
IL_0005: call ""void System.Console.Write(string)""
IL_000a: ldnull
IL_000b: newobj ""S1..ctor(string)""
IL_0010: ret
}
");
}
[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/71773")]
public void UserDefinedCast_RefStruct_Explicit()
{
var source = """
class C
{
S M1()
{
S s;
s = (S)100; // 1
return s;
}
S M2()
{
return (S)200; // 2
}
S M3(in int x)
{
S s;
s = (S)x; // 3
return s;
}
S M4(in int x)
{
return (S)x;
}
S M4s(scoped in int x)
{
return (S)x; // 4
}
S M5(in int x)
{
S s = (S)x;
return s;
}
S M5s(scoped in int x)
{
S s = (S)x;
return s; // 5
}
S M6()
{
S s = (S)300;
return s; // 6
}
void M7(in int x)
{
scoped S s;
s = (S)x;
s = (S)100;
}
}
[System.Runtime.CompilerServices.Union]
ref struct S
{
public S(in int x) => throw null;
public object Value => throw null;
}
""";
CreateCompilation([source, UnionAttributeSource]).VerifyDiagnostics(
// (6,13): error CS8347: Cannot use a result of 'S.S(in int)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// s = (S)100; // 1
Diagnostic(ErrorCode.ERR_EscapeCall, "(S)100").WithArguments("S.S(in int)", "x").WithLocation(6, 13),
// (6,16): error CS8156: An expression cannot be used in this context because it may not be passed or returned by reference
// s = (S)100; // 1
Diagnostic(ErrorCode.ERR_RefReturnLvalueExpected, "100").WithLocation(6, 16),
// (12,16): error CS8347: Cannot use a result of 'S.S(in int)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// return (S)200; // 2
Diagnostic(ErrorCode.ERR_EscapeCall, "(S)200").WithArguments("S.S(in int)", "x").WithLocation(12, 16),
// (12,19): error CS8156: An expression cannot be used in this context because it may not be passed or returned by reference
// return (S)200; // 2
Diagnostic(ErrorCode.ERR_RefReturnLvalueExpected, "200").WithLocation(12, 19),
// (18,13): error CS8347: Cannot use a result of 'S.S(in int)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// s = (S)x; // 3
Diagnostic(ErrorCode.ERR_EscapeCall, "(S)x").WithArguments("S.S(in int)", "x").WithLocation(18, 13),
// (18,16): error CS9077: Cannot return a parameter by reference 'x' through a ref parameter; it can only be returned in a return statement
// s = (S)x; // 3
Diagnostic(ErrorCode.ERR_RefReturnOnlyParameter, "x").WithArguments("x").WithLocation(18, 16),
// (29,16): error CS8347: Cannot use a result of 'S.S(in int)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// return (S)x; // 4
Diagnostic(ErrorCode.ERR_EscapeCall, "(S)x").WithArguments("S.S(in int)", "x").WithLocation(29, 16),
// (29,19): error CS9075: Cannot return a parameter by reference 'x' because it is scoped to the current method
// return (S)x; // 4
Diagnostic(ErrorCode.ERR_RefReturnScopedParameter, "x").WithArguments("x").WithLocation(29, 19),
// (41,16): error CS8352: Cannot use variable 's' in this context because it may expose referenced variables outside of their declaration scope
// return s; // 5
Diagnostic(ErrorCode.ERR_EscapeVariable, "s").WithArguments("s").WithLocation(41, 16),
// (47,16): error CS8352: Cannot use variable 's' in this context because it may expose referenced variables outside of their declaration scope
// return s; // 6
Diagnostic(ErrorCode.ERR_EscapeVariable, "s").WithArguments("s").WithLocation(47, 16));
}
[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/71773")]
public void UserDefinedCast_RefStruct_Implicit()
{
var source = """
class C
{
S M1()
{
S s;
s = 100; // 1
return s;
}
S M2()
{
return 200; // 2
}
S M3(in int x)
{
S s;
s = x; // 3
return s;
}
S M4(in int x)
{
return x;
}
S M4s(scoped in int x)
{
return x; // 4
}
S M5(in int x)
{
S s = x;
return s;
}
S M5s(scoped in int x)
{
S s = x;
return s; // 5
}
S M6()
{
S s = 300;
return s; // 6
}
void M7(in int x)
{
scoped S s;
s = x;
s = 100;
}
}
[System.Runtime.CompilerServices.Union]
ref struct S
{
public S(in int x) => throw null;
public object Value => throw null;
}
""";
CreateCompilation([source, UnionAttributeSource]).VerifyDiagnostics(
// (6,13): error CS8156: An expression cannot be used in this context because it may not be passed or returned by reference
// s = 100; // 1
Diagnostic(ErrorCode.ERR_RefReturnLvalueExpected, "100").WithLocation(6, 13),
// (6,13): error CS8347: Cannot use a result of 'S.S(in int)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// s = 100; // 1
Diagnostic(ErrorCode.ERR_EscapeCall, "100").WithArguments("S.S(in int)", "x").WithLocation(6, 13),
// (12,16): error CS8156: An expression cannot be used in this context because it may not be passed or returned by reference
// return 200; // 2
Diagnostic(ErrorCode.ERR_RefReturnLvalueExpected, "200").WithLocation(12, 16),
// (12,16): error CS8347: Cannot use a result of 'S.S(in int)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// return 200; // 2
Diagnostic(ErrorCode.ERR_EscapeCall, "200").WithArguments("S.S(in int)", "x").WithLocation(12, 16),
// (18,13): error CS9077: Cannot return a parameter by reference 'x' through a ref parameter; it can only be returned in a return statement
// s = x; // 3
Diagnostic(ErrorCode.ERR_RefReturnOnlyParameter, "x").WithArguments("x").WithLocation(18, 13),
// (18,13): error CS8347: Cannot use a result of 'S.S(in int)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// s = x; // 3
Diagnostic(ErrorCode.ERR_EscapeCall, "x").WithArguments("S.S(in int)", "x").WithLocation(18, 13),
// (29,16): error CS9075: Cannot return a parameter by reference 'x' because it is scoped to the current method
// return x; // 4
Diagnostic(ErrorCode.ERR_RefReturnScopedParameter, "x").WithArguments("x").WithLocation(29, 16),
// (29,16): error CS8347: Cannot use a result of 'S.S(in int)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// return x; // 4
Diagnostic(ErrorCode.ERR_EscapeCall, "x").WithArguments("S.S(in int)", "x").WithLocation(29, 16),
// (41,16): error CS8352: Cannot use variable 's' in this context because it may expose referenced variables outside of their declaration scope
// return s; // 5
Diagnostic(ErrorCode.ERR_EscapeVariable, "s").WithArguments("s").WithLocation(41, 16),
// (47,16): error CS8352: Cannot use variable 's' in this context because it may expose referenced variables outside of their declaration scope
// return s; // 6
Diagnostic(ErrorCode.ERR_EscapeVariable, "s").WithArguments("s").WithLocation(47, 16));
}
[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/71773")]
public void UserDefinedCast_RefStructArgument()
{
var source = """
class C
{
S2 M1()
{
int x = 1;
S1 s1 = (S1)x;
return (S2)s1; // 1
}
}
ref struct S1
{
public static implicit operator S1(in int x) => throw null;
}
[System.Runtime.CompilerServices.Union]
ref struct S2
{
public S2(S1 s1) => throw null;
public object Value => throw null;
}
""";
CreateCompilation([source, UnionAttributeSource]).VerifyDiagnostics(
// (7,16): error CS8347: Cannot use a result of 'S2.S2(S1)' in this context because it may expose variables referenced by parameter 's1' outside of their declaration scope
// return (S2)s1; // 1
Diagnostic(ErrorCode.ERR_EscapeCall, "(S2)s1").WithArguments("S2.S2(S1)", "s1").WithLocation(7, 16),
// (7,20): error CS8352: Cannot use variable 's1' in this context because it may expose referenced variables outside of their declaration scope
// return (S2)s1; // 1
Diagnostic(ErrorCode.ERR_EscapeVariable, "s1").WithArguments("s1").WithLocation(7, 20));
}
[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/71773")]
public void UserDefinedCast_StandardImplicitConversion_Input()
{
var source = """
class C
{
S M1()
{
S s;
s = 100; // 1
return s;
}
S M2()
{
return 200; // 2
}
S M3(in int x)
{
S s;
s = x; // 3
return s;
}
S M4(in int x)
{
return x; // 4
}
S M4s(scoped in int x)
{
return x; // 5
}
S M5(in int x)
{
S s = x;
return s; // 6
}
S M5s(scoped in int x)
{
S s = x;
return s; // 7
}
S M6()
{
S s = 300;
return s; // 8
}
}
[System.Runtime.CompilerServices.Union]
ref struct S
{
public S(in int? x) => throw null;
public object Value => throw null;
}
""";
CreateCompilation([source, UnionAttributeSource]).VerifyDiagnostics(
// (6,13): error CS8156: An expression cannot be used in this context because it may not be passed or returned by reference
// s = 100; // 1
Diagnostic(ErrorCode.ERR_RefReturnLvalueExpected, "100").WithLocation(6, 13),
// (6,13): error CS8347: Cannot use a result of 'S.S(in int?)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// s = 100; // 1
Diagnostic(ErrorCode.ERR_EscapeCall, "100").WithArguments("S.S(in int?)", "x").WithLocation(6, 13),
// (12,16): error CS8156: An expression cannot be used in this context because it may not be passed or returned by reference
// return 200; // 2
Diagnostic(ErrorCode.ERR_RefReturnLvalueExpected, "200").WithLocation(12, 16),
// (12,16): error CS8347: Cannot use a result of 'S.S(in int?)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// return 200; // 2
Diagnostic(ErrorCode.ERR_EscapeCall, "200").WithArguments("S.S(in int?)", "x").WithLocation(12, 16),
// (18,13): error CS8156: An expression cannot be used in this context because it may not be passed or returned by reference
// s = x; // 3
Diagnostic(ErrorCode.ERR_RefReturnLvalueExpected, "x").WithLocation(18, 13),
// (18,13): error CS8347: Cannot use a result of 'S.S(in int?)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// s = x; // 3
Diagnostic(ErrorCode.ERR_EscapeCall, "x").WithArguments("S.S(in int?)", "x").WithLocation(18, 13),
// (24,16): error CS8156: An expression cannot be used in this context because it may not be passed or returned by reference
// return x; // 4
Diagnostic(ErrorCode.ERR_RefReturnLvalueExpected, "x").WithLocation(24, 16),
// (24,16): error CS8347: Cannot use a result of 'S.S(in int?)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// return x; // 4
Diagnostic(ErrorCode.ERR_EscapeCall, "x").WithArguments("S.S(in int?)", "x").WithLocation(24, 16),
// (29,16): error CS8156: An expression cannot be used in this context because it may not be passed or returned by reference
// return x; // 5
Diagnostic(ErrorCode.ERR_RefReturnLvalueExpected, "x").WithLocation(29, 16),
// (29,16): error CS8347: Cannot use a result of 'S.S(in int?)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// return x; // 5
Diagnostic(ErrorCode.ERR_EscapeCall, "x").WithArguments("S.S(in int?)", "x").WithLocation(29, 16),
// (35,16): error CS8352: Cannot use variable 's' in this context because it may expose referenced variables outside of their declaration scope
// return s; // 6
Diagnostic(ErrorCode.ERR_EscapeVariable, "s").WithArguments("s").WithLocation(35, 16),
// (41,16): error CS8352: Cannot use variable 's' in this context because it may expose referenced variables outside of their declaration scope
// return s; // 7
Diagnostic(ErrorCode.ERR_EscapeVariable, "s").WithArguments("s").WithLocation(41, 16),
// (47,16): error CS8352: Cannot use variable 's' in this context because it may expose referenced variables outside of their declaration scope
// return s; // 8
Diagnostic(ErrorCode.ERR_EscapeVariable, "s").WithArguments("s").WithLocation(47, 16));
}
[Fact, WorkItem("https://github.com/dotnet/roslyn/issues/71773")]
public void UserDefinedCast_Call()
{
var source = """
class C
{
S M1(int x)
{
return M2(x);
}
S M2(S s) => s;
}
[System.Runtime.CompilerServices.Union]
ref struct S
{
public S(in int x) => throw null;
public object Value => throw null;
}
""";
CreateCompilation([source, UnionAttributeSource]).VerifyDiagnostics(
// (5,16): error CS8347: Cannot use a result of 'C.M2(S)' in this context because it may expose variables referenced by parameter 's' outside of their declaration scope
// return M2(x);
Diagnostic(ErrorCode.ERR_EscapeCall, "M2(x)").WithArguments("C.M2(S)", "s").WithLocation(5, 16),
// (5,19): error CS8166: Cannot return a parameter by reference 'x' because it is not a ref parameter
// return M2(x);
Diagnostic(ErrorCode.ERR_RefReturnParameter, "x").WithArguments("x").WithLocation(5, 19),
// (5,19): error CS8347: Cannot use a result of 'S.S(in int)' in this context because it may expose variables referenced by parameter 'x' outside of their declaration scope
// return M2(x);
Diagnostic(ErrorCode.ERR_EscapeCall, "x").WithArguments("S.S(in int)", "x").WithLocation(5, 19));
}
[Fact]
public void NullableAnalysis_01_State_From_Default()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S3
{
public S3(int? x) => throw null!;
public S3(bool? x) => throw null!;
public S3(string? x) => throw null!;
public object Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
S1 s = default;
_ = s switch { int => 1, bool => 3 };
}
static void Test3()
{
#line 300
S2 s = default;
_ = s switch { int => 1, bool => 3 };
}
static void Test4()
{
#line 400
S3 s = default;
_ = s switch { int => 1, bool => 3, string => 4 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (101,15): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(101, 15)
);
}
[Fact]
public void NullableAnalysis_02_State_From_Default()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
class S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
class S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
S1? s = null;
_ = s switch { int => 1, bool => 3 };
}
static void Test3()
{
#line 300
S2? s = null;
_ = s switch { int => 1, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (101,15): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(101, 15),
// (301,15): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 15)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_03_State_From_Default([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1(bool x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S3
{
public S3(int? x) => throw null!;
public S3(bool? x) => throw null!;
public object Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
static void Test4(S2 s)
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
static void Test5(S3 s)
{
#line 500
_ = s switch { int => 1, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,15): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(200, 15)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_04_State_From_Default_PostCondition([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, NotNullAttributeDefinition]);
comp.VerifyDiagnostics(
// (200,15): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(200, 15)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_05_State_From_Constructor([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
var s = new S1(1);
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
var s = new S1("""");
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
var s = new S1(x);
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test4(bool x)
{
#line 400
var s = new S1(x);
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
var s = new S1(x);
_ = s switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,15): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 15),
// (501,15): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 15)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_06_State_From_Constructor_PostCondition([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] string? x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
var s = new S1(1);
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
var s = new S1("""");
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
var s = new S1(x);
_ = s switch { int => 1, string => 2, bool => 3 };
x.ToString();
}
static void Test4(bool x)
{
#line 400
var s = new S1(x);
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
var s = new S1(x);
_ = s switch { int => 1, string => 2, bool => 3 };
x.Value.ToString();
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, NotNullAttributeDefinition]);
comp.VerifyDiagnostics();
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_07_State_From_Conversion([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
S1 s = 1;
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
S1 s = """";
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
S1 s = x;
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test4(bool x)
{
#line 400
S1 s = x;
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
S1 s = x;
_ = s switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,15): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 15),
// (501,15): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 15)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_08_State_From_Conversion_PostCondition([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] string? x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
S1 s = 1;
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
S1 s = """";
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
S1 s = x;
_ = s switch { int => 1, string => 2, bool => 3 };
x.ToString();
}
static void Test4(bool x)
{
#line 400
S1 s = x;
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
S1 s = x;
_ = s switch { int => 1, string => 2, bool => 3 };
x.Value.ToString();
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, NotNullAttributeDefinition]);
comp.VerifyDiagnostics();
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_09_State_From_Conversion_TupleLiteral([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
(S1, int) s = (1, 1);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
(S1, int) s = ("""", 1);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
(S1, int) s = (x, 1);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test4(bool x)
{
#line 400
(S1, int) s = (x, 1);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
(S1, int) s = (x, 1);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1 switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 21),
// (501,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1 switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 21)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_10_State_From_Conversion_TupleLiteral_PostCondition([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] string? x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
(S1, int) s = (1, 1);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
(S1, int) s = ("""", 1);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
(S1, int) s = (x, 1);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
x.ToString();
}
static void Test4(bool x)
{
#line 400
(S1, int) s = (x, 1);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
(S1, int) s = (x, 1);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
x.Value.ToString();
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, NotNullAttributeDefinition]);
comp.VerifyDiagnostics();
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_11_State_From_Conversion_TupleValue([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1((int, int) x)
{
#line 100
(S1, int) s = x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test2((string, int) x)
{
#line 200
(S1, int) s = x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test3((string?, int) x)
{
#line 300
(S1, int) s = x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test4((bool, int) x)
{
#line 400
(S1, int) s = x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test5((bool?, int) x)
{
#line 500
(S1, int) s = x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1 switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 21),
// (501,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1 switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 21)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_12_State_From_Conversion_TupleValue_PostCondition([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] string? x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1((int, int) x)
{
#line 100
(S1, int) s = x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test2((string, int) x)
{
#line 200
(S1, int) s = x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test3((string?, int) x)
{
#line 300
(S1, int) s = x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
x.Item1.ToString();
}
static void Test4((bool, int) x)
{
#line 400
(S1, int) s = x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test5((bool?, int) x)
{
#line 500
(S1, int) s = x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
x.Item1.Value.ToString();
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, NotNullAttributeDefinition]);
comp.VerifyDiagnostics();
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_13_State_From_Conversion_Cast([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
S1 s = (S1)1;
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
S1 s = (S1)"""";
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
S1 s = (S1)x;
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test4(bool x)
{
#line 400
S1 s = (S1)x;
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
S1 s = (S1)x;
_ = s switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,15): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 15),
// (501,15): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 15)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_14_State_From_Conversion_Cast_PostCondition([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] string? x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
S1 s = (S1)1;
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
S1 s = (S1)"""";
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
S1 s = (S1)x;
_ = s switch { int => 1, string => 2, bool => 3 };
x.ToString();
}
static void Test4(bool x)
{
#line 400
S1 s = (S1)x;
_ = s switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
S1 s = (S1)x;
_ = s switch { int => 1, string => 2, bool => 3 };
x.Value.ToString();
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, NotNullAttributeDefinition]);
comp.VerifyDiagnostics();
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_15_State_From_Conversion_Cast_TupleLiteral([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
(S1, int) s = ((S1, int))(1, 1.0);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
(S1, int) s = ((S1, int))("""", 1.0);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
(S1, int) s = ((S1, int))(x, 1.0);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test4(bool x)
{
#line 400
(S1, int) s = ((S1, int))(x, 1.0);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
(S1, int) s = ((S1, int))(x, 1.0);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1 switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 21),
// (501,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1 switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 21)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_16_State_From_Conversion_Cast_TupleLiteral_PostCondition([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] string? x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
(S1, int) s = ((S1, int))(1, 1.0);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
(S1, int) s = ((S1, int))("""", 1.0);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
(S1, int) s = ((S1, int))(x, 1.0);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
x.ToString();
}
static void Test4(bool x)
{
#line 400
(S1, int) s = ((S1, int))(x, 1.0);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
(S1, int) s = ((S1, int))(x, 1.0);
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
x.Value.ToString();
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, NotNullAttributeDefinition]);
comp.VerifyDiagnostics();
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_17_State_From_Conversion_Cast_TupleValue([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1((int, long) x)
{
#line 100
(S1, int) s = ((S1, int))x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test2((string, long) x)
{
#line 200
(S1, int) s = ((S1, int))x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test3((string?, long) x)
{
#line 300
(S1, int) s = ((S1, int))x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test4((bool, long) x)
{
#line 400
(S1, int) s = ((S1, int))x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test5((bool?, long) x)
{
#line 500
(S1, int) s = ((S1, int))x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1 switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 21),
// (501,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1 switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 21)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_18_State_From_Conversion_Cast_TupleValue_PostCondition([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] string? x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.NotNull] bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1((int, long) x)
{
#line 100
(S1, int) s = ((S1, int))x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test2((string, long) x)
{
#line 200
(S1, int) s = ((S1, int))x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test3((string?, long) x)
{
#line 300
(S1, int) s = ((S1, int))x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
x.Item1.ToString();
}
static void Test4((bool, long) x)
{
#line 400
(S1, int) s = ((S1, int))x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
}
static void Test5((bool?, long) x)
{
#line 500
(S1, int) s = ((S1, int))x;
_ = s.Item1 switch { int => 1, string => 2, bool => 3 };
x.Item1.Value.ToString();
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, NotNullAttributeDefinition]);
comp.VerifyDiagnostics();
}
[Fact]
public void NullableAnalysis_19_State_From_Null_Test()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s is null)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S2 s)
{
if (s is null)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(100, 19),
// (300,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(300, 19)
);
}
[Fact]
public void NullableAnalysis_20_State_From_Null_Test_Class()
{
var src1 = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
class S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
class S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s is null)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S2 s)
{
if (s is null)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp1 = CreateCompilation([src1, UnionAttributeSource]);
comp1.VerifyDiagnostics(
// (100,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(100, 19),
// (300,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(300, 19)
);
var src2 = @"
#nullable enable
class S1
{
public object? Value => throw null!;
}
class S2
{
public object Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
_ = s.Value;
if (s is null or { Value: null })
{
#line 1000
_ = s switch { { Value: {} } => 1 };
}
else
{
#line 2000
_ = s switch { { Value: {} } => 1 };
}
}
static void Test4(S2 s)
{
_ = s.Value;
if (s is null or { Value: null })
{
#line 3000
_ = s switch { { Value: {} } => 1 };
}
else
{
#line 4000
_ = s switch { { Value: {} } => 1 };
}
}
}
";
var comp2 = CreateCompilation(src2);
comp2.VerifyDiagnostics(
// (1000,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { { Value: {} } => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(1000, 19),
// (2000,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { { Value: {} } => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(2000, 19),
// (3000,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { { Value: {} } => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(3000, 19),
// (4000,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { { Value: {} } => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(4000, 19)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_21_State_From_NotNull_Test([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s is not null)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S2 s)
{
if (s is not null)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(200, 19),
// (400,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(400, 19)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_22_State_From_Type_Test([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1(bool x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S3
{
public S3(int? x) => throw null!;
public S3(bool? x) => throw null!;
public object Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s is int)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S2 s)
{
if (s is int)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
static void Test5(S3 s)
{
if (s is int)
{
#line 500
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 600
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(200, 19)
);
}
[Fact]
public void NullableAnalysis_23_State_From_NotType_Test()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S3
{
public S3(int? x) => throw null!;
public S3(bool? x) => throw null!;
public object Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s is not int)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S2 s)
{
if (s is not int)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
static void Test5(S3 s)
{
if (s is not int)
{
#line 500
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 600
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(100, 19)
);
}
[Fact]
public void NullableAnalysis_24_State_From_NotType_Test_Class()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
class S1
{
public S1(int x) => throw null!;
public S1(bool x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
class S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
class S3
{
public S3(int? x) => throw null!;
public S3(bool? x) => throw null!;
public object Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s is not int)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S2 s)
{
if (s is not int)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
static void Test5(S3 s)
{
if (s is not int)
{
#line 500
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 600
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
// https://github.com/dotnet/roslyn/issues/82636: This is another case of behavior consistent with explicit property patterns. See below
comp.VerifyDiagnostics(
// (100,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(100, 19),
// (200,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(200, 19)
);
var src2 = @"
#nullable enable
class S1
{
public object? Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
_ = s.Value;
if (s is { Value: not int })
{
#line 1000
_ = s switch { { Value: {} } => 1 };
}
else
{
#line 2000
_ = s switch { { Value: {} } => 1 };
}
}
}
";
var comp2 = CreateCompilation(src2);
comp2.VerifyDiagnostics(
// (1000,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { { Value: {} } => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(1000, 19),
// (2000,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { { Value: {} } => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(2000, 19)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_25_State_From_Value_Test([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(int x) => throw null!;
public S1(bool x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S3
{
public S3(int? x) => throw null!;
public S3(bool? x) => throw null!;
public object Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s is 1)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S2 s)
{
if (s is 1)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
static void Test5(S3 s)
{
if (s is 1)
{
#line 500
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 600
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(200, 19)
);
}
[Fact]
public void NullableAnalysis_26_State_From_NotValue_Test()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S3
{
public S3(int? x) => throw null!;
public S3(bool? x) => throw null!;
public object Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s is not 1)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S2 s)
{
if (s is not 1)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
static void Test5(S3 s)
{
if (s is not 1)
{
#line 500
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 600
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(100, 19)
);
}
[Fact]
public void NullableAnalysis_27_State_From_NotValue_Test_Class()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
class S1
{
public S1(int x) => throw null!;
public S1(bool x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
class S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
class S3
{
public S3(int? x) => throw null!;
public S3(bool? x) => throw null!;
public object Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s is not 1)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S2 s)
{
if (s is not 1)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
static void Test5(S3 s)
{
if (s is not 1)
{
#line 500
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 600
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
// https://github.com/dotnet/roslyn/issues/82636: This is another case of behavior consistent with explicit property patterns. See below
comp.VerifyDiagnostics(
// (100,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(100, 19),
// (200,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(200, 19)
);
var src2 = @"
#nullable enable
class S1
{
public object? Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
_ = s.Value;
if (s is { Value: not 1 })
{
#line 1000
_ = s switch { { Value: {} } => 1 };
}
else
{
#line 2000
_ = s switch { { Value: {} } => 1 };
}
}
}
";
var comp2 = CreateCompilation(src2);
comp2.VerifyDiagnostics(
// (1000,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { { Value: {} } => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(1000, 19),
// (2000,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { { Value: {} } => 1 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(2000, 19)
);
}
[Fact]
public void NullableAnalysis_28()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
[System.Diagnostics.CodeAnalysis.MemberNotNull(nameof(OtherProp))]
public object? Value => throw null!;
public string? OtherProp => throw null!;
}
public interface I1
{
object? Value { get; }
}
struct S2 : I1
{
public S2(int x) => throw null!;
public S2(bool? x) => throw null!;
[System.Diagnostics.CodeAnalysis.MemberNotNull(nameof(OtherProp))]
object? I1.Value => throw null!;
public string? OtherProp => throw null!;
}
class Program
{
static void Test2(S1 s)
{
#line 200
_ = s switch { bool => s.OtherProp.ToString(), _ => """" };
}
static void Test3(S2 s)
{
#line 300
_ = s switch { I1 and { Value: bool } => s.OtherProp.ToString(), _ => """" };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, MemberNotNullAttributeDefinition]);
comp.VerifyDiagnostics(
// (300,25): hidden CS9335: The pattern is redundant.
// _ = s switch { I1 and { Value: bool } => s.OtherProp.ToString(), _ => "" };
Diagnostic(ErrorCode.HDN_RedundantPattern, "I1").WithLocation(300, 25),
// (300,51): warning CS8602: Dereference of a possibly null reference.
// _ = s switch { I1 and { Value: bool } => s.OtherProp.ToString(), _ => "" };
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "s.OtherProp").WithLocation(300, 51)
);
}
[Fact]
public void NullableAnalysis_29()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
[System.Diagnostics.CodeAnalysis.MemberNotNull(nameof(OtherProp))]
public object? Value => throw null!;
public string? OtherProp => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(int x) => throw null!;
public S2(bool? x) => throw null!;
[System.Diagnostics.CodeAnalysis.MemberNotNull(nameof(OtherProp))]
public object? Value => throw null!;
public string? OtherProp => throw null!;
}
class Program
{
static void Test2(S1 s)
{
#line 200
_ = s switch { bool => s.OtherProp.ToString(), _ => """" };
}
static void Test3(S2 s)
{
#line 300
_ = s switch { bool => s.OtherProp.ToString(), _ => """" };
}
}
";
var comp = CreateCompilation([src, MemberNotNullAttributeDefinition, UnionAttributeSource]);
comp.VerifyDiagnostics();
}
[Fact]
public void NullableAnalysis_30()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
[System.Diagnostics.CodeAnalysis.MemberNotNull(nameof(OtherProp))]
public object? Value => throw null!;
public string? OtherProp => throw null!;
}
class Program
{
static void Test2(S1 s)
{
#line 200
_ = s switch { bool => s.OtherProp.ToString(), _ => """" };
}
}
";
var comp = CreateCompilation([src, MemberNotNullAttributeDefinition, UnionAttributeSource]);
comp.VerifyDiagnostics();
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_31_Conversion_Value_Check([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1(string x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1(string? x)
{
#line 100
S1 s = x;
x.ToString();
}
static void Test2(string? x)
{
#line 200
var s = new S1(x);
x.ToString();
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,16): warning CS8604: Possible null reference argument for parameter 'x' in 'S1.S1(string x)'.
// S1 s = x;
Diagnostic(ErrorCode.WRN_NullReferenceArgument, "x").WithArguments("x", "S1.S1(string x)").WithLocation(100, 16),
// (200,24): warning CS8604: Possible null reference argument for parameter 'x' in 'S1.S1(string x)'.
// var s = new S1(x);
Diagnostic(ErrorCode.WRN_NullReferenceArgument, "x").WithArguments("x", "S1.S1(string x)").WithLocation(200, 24)
);
}
[Theory]
[CombinatorialData]
public void NullableAnalysis_32_Conversion_Value_Check([CombinatorialValues("class", "struct")] string typeKind)
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
" + typeKind + @" S1
{
public S1([System.Diagnostics.CodeAnalysis.DisallowNull] string? x) => throw null!;
public S1([System.Diagnostics.CodeAnalysis.DisallowNull] bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1(string? x)
{
#line 100
S1 s = x;
x.ToString();
}
static void Test2(string? x)
{
#line 200
var s = new S1(x);
x.ToString();
}
static void Test3(bool? x)
{
#line 300
S1 s = x;
x.Value.ToString();
}
static void Test4(bool? x)
{
#line 400
var s = new S1(x);
x.Value.ToString();
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, DisallowNullAttributeDefinition]);
comp.VerifyDiagnostics(
// (100,16): warning CS8604: Possible null reference argument for parameter 'x' in 'S1.S1(string? x)'.
// S1 s = x;
Diagnostic(ErrorCode.WRN_NullReferenceArgument, "x").WithArguments("x", "S1.S1(string? x)").WithLocation(100, 16),
// (200,24): warning CS8604: Possible null reference argument for parameter 'x' in 'S1.S1(string? x)'.
// var s = new S1(x);
Diagnostic(ErrorCode.WRN_NullReferenceArgument, "x").WithArguments("x", "S1.S1(string? x)").WithLocation(200, 24),
// (300,16): warning CS8607: A possible null value may not be used for a type marked with [NotNull] or [DisallowNull]
// S1 s = x;
Diagnostic(ErrorCode.WRN_DisallowNullAttributeForbidsMaybeNullAssignment, "x").WithLocation(300, 16),
// (400,24): warning CS8607: A possible null value may not be used for a type marked with [NotNull] or [DisallowNull]
// var s = new S1(x);
Diagnostic(ErrorCode.WRN_DisallowNullAttributeForbidsMaybeNullAssignment, "x").WithLocation(400, 24)
);
}
[Fact]
public void NullableAnalysis_33_State_From_Default_NullableOfUnion()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S3
{
public S3(int? x) => throw null!;
public S3(bool? x) => throw null!;
public object Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
S1? s = default(S1);
_ = s.Value switch { int => 1, bool => 3 };
}
static void Test3()
{
#line 300
S2? s = default(S2);
_ = s.Value switch { int => 1, bool => 3 };
}
static void Test4()
{
#line 400
S3? s = default(S3);
_ = s.Value switch { int => 1, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (101,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Value switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(101, 21)
);
}
[Fact]
public void NullableAnalysis_34_State_From_Default_NullableOfUnion()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S3
{
public S3(int? x) => throw null!;
public S3(bool? x) => throw null!;
public object Value => throw null!;
}
class Program
{
static void Test2(S1? s)
{
if (s is null) return;
#line 200
_ = s.Value switch { int => 1, bool => 3 };
}
static void Test4(S2? s)
{
if (s is null) return;
#line 400
_ = s.Value switch { int => 1, bool => 3 };
}
static void Test5(S3? s)
{
if (s is null) return;
#line 500
_ = s.Value switch { int => 1, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics();
}
[Fact]
public void NullableAnalysis_35_State_From_Constructor_NullableOfUnion()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
S1? s = new S1(1);
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
S1? s = new S1("""");
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
S1? s = new S1(x);
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test4(bool x)
{
#line 400
S1? s = new S1(x);
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
S1? s = new S1(x);
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 21),
// (501,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 21)
);
}
[Fact]
public void NullableAnalysis_36_State_From_Conversion_NullableOfUnion()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
S1? s = 1;
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
S1? s = """";
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
S1? s = x;
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test4(bool x)
{
#line 400
S1? s = x;
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
S1? s = x;
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 21),
// (501,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 21)
);
}
[Fact]
public void NullableAnalysis_37_State_From_Conversion_TupleLiteral_NullableOfUnion()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
(S1?, int) s = (1, 1);
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
(S1?, int) s = ("""", 1);
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
(S1?, int) s = (x, 1);
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test4(bool x)
{
#line 400
(S1?, int) s = (x, 1);
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
(S1?, int) s = (x, 1);
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,27): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 27),
// (501,27): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 27)
);
}
[Fact]
public void NullableAnalysis_38_State_From_Conversion_TupleValue_NullableOfUnion()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1((int, int) x)
{
#line 100
(S1?, int) s = x;
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test2((string, int) x)
{
#line 200
(S1?, int) s = x;
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test3((string?, int) x)
{
#line 300
(S1?, int) s = x;
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test4((bool, int) x)
{
#line 400
(S1?, int) s = x;
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test5((bool?, int) x)
{
#line 500
(S1?, int) s = x;
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,27): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 27),
// (501,27): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 27)
);
}
[Fact]
public void NullableAnalysis_39_State_From_Conversion_Cast_NullableOfUnion()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
S1? s = (S1?)1;
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
S1? s = (S1?)"""";
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
S1? s = (S1?)x;
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test4(bool x)
{
#line 400
S1? s = (S1?)x;
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
S1? s = (S1?)x;
_ = s.Value switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 21),
// (501,21): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 21)
);
}
[Fact]
public void NullableAnalysis_40_State_From_Conversion_Cast_TupleLiteral_NullableOfUnion()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1()
{
#line 100
(S1?, int) s = ((S1?, int))(1, 1);
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test2()
{
#line 200
(S1?, int) s = ((S1?, int))("""", 1);
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test3(string? x)
{
#line 300
(S1?, int) s = ((S1?, int))(x, 1);
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test4(bool x)
{
#line 400
(S1?, int) s = ((S1?, int))(x, 1);
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test5(bool? x)
{
#line 500
(S1?, int) s = ((S1?, int))(x, 1);
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,27): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 27),
// (501,27): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 27)
);
}
[Fact]
public void NullableAnalysis_41_State_From_Conversion_Cast_TupleValue_NullableOfUnion()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1((int, int) x)
{
#line 100
(S1?, int) s = ((S1?, int))x;
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test2((string, int) x)
{
#line 200
(S1?, int) s = ((S1?, int))x;
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test3((string?, int) x)
{
#line 300
(S1?, int) s = ((S1?, int))x;
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test4((bool, int) x)
{
#line 400
(S1?, int) s = ((S1?, int))x;
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
static void Test5((bool?, int) x)
{
#line 500
(S1?, int) s = ((S1?, int))x;
_ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (301,27): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 27),
// (501,27): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Item1.Value switch { int => 1, string => 2, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(501, 27)
);
}
[Fact]
public void NullableAnalysis_42_State_From_Null_Test_NullableOfUnion()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test2(S1? s0)
{
if (s0 is null) return;
if (s0.Value is null)
{
var s = s0;
#line 100
_ = s.Value switch { int => 1, bool => 3 };
}
else
{
var s = s0;
#line 200
_ = s.Value switch { int => 1, bool => 3 };
}
}
static void Test4(S2? s0)
{
if (s0 is null) return;
if (s0.Value is null)
{
var s = s0;
#line 300
_ = s.Value switch { int => 1, bool => 3 };
}
else
{
var s = s0;
#line 400
_ = s.Value switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,25): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Value switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(100, 25),
// (300,25): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Value switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(300, 25)
);
}
[Fact]
public void NullableAnalysis_43_State_From_NotNull_Test_NullableOfUnion()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
[System.Runtime.CompilerServices.Union]
struct S2
{
public S2(int x) => throw null!;
public S2(bool x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test2(S1? s0)
{
if (s0 is null) return;
if (s0.Value is not null)
{
var s = s0;
#line 100
_ = s.Value switch { int => 1, bool => 3 };
}
else
{
var s = s0;
#line 200
_ = s.Value switch { int => 1, bool => 3 };
}
}
static void Test4(S2? s0)
{
if (s0 is null) return;
if (s0.Value is not null)
{
var s = s0;
#line 300
_ = s.Value switch { int => 1, bool => 3 };
}
else
{
var s = s0;
#line 400
_ = s.Value switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,25): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Value switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(200, 25),
// (400,25): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s.Value switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(400, 25)
);
}
[Fact]
public void NullableAnalysis_44_Conversion_Value_Check_ReinferConstructor()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1<T>
{
public S1(T x) => throw null!;
public S1(bool x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test1(string? x, string? y)
{
var s = GetS1(y);
#line 100
s = x;
x.ToString();
}
static void Test2(string? x, string y)
{
var s = GetS1(y);
#line 200
s = x;
x.ToString();
}
static S1<T> GetS1<T>(T x)
{
return default;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (101,9): warning CS8602: Dereference of a possibly null reference.
// x.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "x").WithLocation(101, 9),
// (200,13): warning CS8604: Possible null reference argument for parameter 'x' in 'S1<string>.S1(string x)'.
// s = x;
Diagnostic(ErrorCode.WRN_NullReferenceArgument, "x").WithArguments("x", "S1<string>.S1(string x)").WithLocation(200, 13)
);
}
[Fact]
public void NullableAnalysis_45_ValuePropertyOfTheInterfaceIsTargetedNotValuePropertyOfTheType()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s is not null)
{
#line 100
s.Value.ToString();
}
else
{
#line 200
s.Value.ToString();
}
}
static void Test4(S1 s)
{
if (s is null)
{
#line 300
s.Value.ToString();
}
else
{
#line 400
s.Value.ToString();
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,13): warning CS8602: Dereference of a possibly null reference.
// s.Value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "s.Value").WithLocation(200, 13),
// (300,13): warning CS8602: Dereference of a possibly null reference.
// s.Value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "s.Value").WithLocation(300, 13)
);
}
[Fact]
public void NonBoxingUnionMatching_01_HasValue_Struct()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
public bool HasValue => _value != null;
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1()));
}
static bool Test1(S1 u)
{
return u is null;
}
static bool Test2(S1 u)
{
return u is not null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "FalseTrueTrueFalse").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 11 (0xb)
.maxstack 2
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1.HasValue.get""
IL_0007: ldc.i4.0
IL_0008: ceq
IL_000a: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 8 (0x8)
.maxstack 1
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1.HasValue.get""
IL_0007: ret
}
");
}
[Theory]
[CombinatorialData]
public void NonBoxingUnionMatching_02_HasValue_Struct([CombinatorialValues("internal", "private")] string accessibility)
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
" + accessibility + @" bool HasValue => throw null;
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1()));
}
static bool Test1(S1 u)
{
return u is null;
}
static bool Test2(S1 u)
{
return u is not null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "FalseTrueTrueFalse").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 11 (0xb)
.maxstack 2
IL_0000: ldarga.s V_0
IL_0002: call ""object S1.Value.get""
IL_0007: ldnull
IL_0008: ceq
IL_000a: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 11 (0xb)
.maxstack 2
IL_0000: ldarga.s V_0
IL_0002: call ""object S1.Value.get""
IL_0007: ldnull
IL_0008: cgt.un
IL_000a: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_03_HasValue_Class()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
public bool HasValue => _value != null;
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1(null)));
System.Console.Write(Test1(null));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1(null)));
System.Console.Write(Test2(null));
}
static bool Test1(S1 u)
{
return u is null;
}
static bool Test2(S1 u)
{
return u is not null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "FalseTrueTrueTrueFalseFalse").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 19 (0x13)
.maxstack 1
.locals init (bool V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000b
IL_0003: ldarg.0
IL_0004: callvirt ""bool S1.HasValue.get""
IL_0009: brtrue.s IL_000f
IL_000b: ldc.i4.1
IL_000c: stloc.0
IL_000d: br.s IL_0011
IL_000f: ldc.i4.0
IL_0010: stloc.0
IL_0011: ldloc.0
IL_0012: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 12 (0xc)
.maxstack 1
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000a
IL_0003: ldarg.0
IL_0004: callvirt ""bool S1.HasValue.get""
IL_0009: ret
IL_000a: ldc.i4.0
IL_000b: ret
}
");
}
[Theory]
[CombinatorialData]
public void NonBoxingUnionMatching_04_HasValue_Class([CombinatorialValues("internal", "private", "protected", "private protected", "protected internal")] string accessibility)
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
" + accessibility + @" bool HasValue => throw null;
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1(null)));
System.Console.Write(Test1(null));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1(null)));
System.Console.Write(Test2(null));
}
static bool Test1(S1 u)
{
return u is null;
}
static bool Test2(S1 u)
{
return u is not null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "FalseTrueTrueTrueFalseFalse").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 19 (0x13)
.maxstack 1
.locals init (bool V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000b
IL_0003: ldarg.0
IL_0004: callvirt ""object S1.Value.get""
IL_0009: brtrue.s IL_000f
IL_000b: ldc.i4.1
IL_000c: stloc.0
IL_000d: br.s IL_0011
IL_000f: ldc.i4.0
IL_0010: stloc.0
IL_0011: ldloc.0
IL_0012: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 15 (0xf)
.maxstack 2
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000d
IL_0003: ldarg.0
IL_0004: callvirt ""object S1.Value.get""
IL_0009: ldnull
IL_000a: cgt.un
IL_000c: ret
IL_000d: ldc.i4.0
IL_000e: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_05_HasValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
public bool HasValue => _value != null;
static void Main()
{
System.Console.Write(Test2(new S1(1)));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(2)));
}
static bool Test2(S1 u)
{
return u is not null and 1;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseFalse").VerifyDiagnostics();
// The IL would be shorter without HasValue, but, I guess, we expect
// non-boxing pattern to be fully implemented if HasValue is present.
// The scenario is somewhat pathological as well, no actual need to have 'not null'
// pattern in the code.
verifier.VerifyIL("S1.Test2", @"
{
// Code size 37 (0x25)
.maxstack 2
.locals init (object V_0)
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1.HasValue.get""
IL_0007: brfalse.s IL_0023
IL_0009: ldarga.s V_0
IL_000b: call ""object S1.Value.get""
IL_0010: stloc.0
IL_0011: ldloc.0
IL_0012: isinst ""int""
IL_0017: brfalse.s IL_0023
IL_0019: ldloc.0
IL_001a: unbox.any ""int""
IL_001f: ldc.i4.1
IL_0020: ceq
IL_0022: ret
IL_0023: ldc.i4.0
IL_0024: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_06_HasValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
static void Main()
{
System.Console.Write(Test2(new S1(1)));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(""a"")));
}
static int Test2(S1 u)
{
#line 26
return u switch { null => 0, not null => 1};
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "HasValue 1HasValue 0HasValue 1").VerifyDiagnostics(
// (26,42): hidden CS9335: The pattern is redundant.
// return u switch { null => 0, not null => 1};
Diagnostic(ErrorCode.HDN_RedundantPattern, "null").WithLocation(26, 42)
);
verifier.VerifyIL("S1.Test2", @"
{
// Code size 17 (0x11)
.maxstack 1
.locals init (int V_0)
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1.HasValue.get""
IL_0007: brtrue.s IL_000d
IL_0009: ldc.i4.0
IL_000a: stloc.0
IL_000b: br.s IL_000f
IL_000d: ldc.i4.1
IL_000e: stloc.0
IL_000f: ldloc.0
IL_0010: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_07_HasValue_Class_Inheritance()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class C1
{
private readonly object _value;
public C1(int x) { _value = x; }
public C1(string x) { _value = x; }
public object Value => _value;
public bool HasValue => throw null; // https://github.com/dotnet/roslyn/issues/82636: Inheritance isn't handled yet
}
[System.Runtime.CompilerServices.Union]
class C2 : C1
{
public C2(int x) : base(x) { }
public C2(string x) : base(x) { }
public new object Value => base.Value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new C2(1)));
System.Console.Write(Test1(new C2(null)));
System.Console.Write(Test1(null));
}
static bool Test1(C2 u)
{
return u is null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "FalseTrueTrue").VerifyDiagnostics();
}
[Fact]
public void NonBoxingUnionMatching_08_HasValue_Class_Inheritance()
{
var src = @"
class C0
{
public bool HasValue => throw null; // https://github.com/dotnet/roslyn/issues/82636: Inheritance isn't handled yet
}
[System.Runtime.CompilerServices.Union]
class C1 : C0
{
private readonly object _value;
public C1(int x) { _value = x; }
public C1(string x) { _value = x; }
public object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new C1(1)));
System.Console.Write(Test1(new C1(null)));
System.Console.Write(Test1(null));
}
static bool Test1(C1 u)
{
return u is null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: "FalseTrueTrue").VerifyDiagnostics();
}
[Fact]
public void NonBoxingUnionMatching_09_HasValue_Class_Inheritance()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class C1
{
protected readonly object _value;
public C1(int x) { _value = x; }
public C1(string x) { _value = x; }
public object Value => _value;
}
[System.Runtime.CompilerServices.Union]
class C2 : C1
{
public C2(int x) : base(x) { }
public C2(string x) : base(x) { }
public bool HasValue => _value != null;
public new object Value => _value;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new C2(1)));
System.Console.Write(Test1(new C2(null)));
System.Console.Write(Test1(null));
}
static bool Test1(C2 u)
{
return u is null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "FalseTrueTrue").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 19 (0x13)
.maxstack 1
.locals init (bool V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000b
IL_0003: ldarg.0
IL_0004: callvirt ""bool C2.HasValue.get""
IL_0009: brtrue.s IL_000f
IL_000b: ldc.i4.1
IL_000c: stloc.0
IL_000d: br.s IL_0011
IL_000f: ldc.i4.0
IL_0010: stloc.0
IL_0011: ldloc.0
IL_0012: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_10_HasValue_Class_Inheritance()
{
var src = @"
[System.Runtime.CompilerServices.Union]
abstract class C1
{
protected readonly object _value;
public C1(int x) { _value = x; }
public C1(string x) { _value = x; }
public object Value => _value;
public abstract bool HasValue { get; }
}
[System.Runtime.CompilerServices.Union]
class C2 : C1
{
public C2(int x) : base(x) { }
public C2(string x) : base(x) { }
public override bool HasValue => _value != null;
public new object Value => _value;
}
[System.Runtime.CompilerServices.Union]
abstract class C3 : C1
{
public C3(int x) : base(x) { }
public C3(string x) : base(x) { }
public abstract override bool HasValue { get; }
public new object Value => _value;
}
class C4 : C3
{
public C4(int x) : base(x) { }
public C4(string x) : base(x) { }
public override bool HasValue => _value != null;
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new C2(1)));
System.Console.Write(Test1(new C2(null)));
System.Console.Write(Test1(null));
System.Console.Write(Test2(new C2(1)));
System.Console.Write(Test2(new C2(null)));
System.Console.Write(Test2(null));
System.Console.Write(Test3(new C4(1)));
System.Console.Write(Test3(new C4(null)));
System.Console.Write(Test3(null));
}
static bool Test1(C1 u)
{
return u is null;
}
static bool Test2(C2 u)
{
return u is null;
}
static bool Test3(C3 u)
{
return u is null;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "FalseTrueTrueFalseTrueTrueFalseTrueTrue").VerifyDiagnostics();
verifier.VerifyIL("Program.Test1", @"
{
// Code size 19 (0x13)
.maxstack 1
.locals init (bool V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000b
IL_0003: ldarg.0
IL_0004: callvirt ""bool C1.HasValue.get""
IL_0009: brtrue.s IL_000f
IL_000b: ldc.i4.1
IL_000c: stloc.0
IL_000d: br.s IL_0011
IL_000f: ldc.i4.0
IL_0010: stloc.0
IL_0011: ldloc.0
IL_0012: ret
}
");
verifier.VerifyIL("Program.Test2", @"
{
// Code size 19 (0x13)
.maxstack 1
.locals init (bool V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000b
IL_0003: ldarg.0
IL_0004: callvirt ""bool C1.HasValue.get""
IL_0009: brtrue.s IL_000f
IL_000b: ldc.i4.1
IL_000c: stloc.0
IL_000d: br.s IL_0011
IL_000f: ldc.i4.0
IL_0010: stloc.0
IL_0011: ldloc.0
IL_0012: ret
}
");
verifier.VerifyIL("Program.Test3", @"
{
// Code size 19 (0x13)
.maxstack 1
.locals init (bool V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000b
IL_0003: ldarg.0
IL_0004: callvirt ""bool C1.HasValue.get""
IL_0009: brtrue.s IL_000f
IL_000b: ldc.i4.1
IL_000c: stloc.0
IL_000d: br.s IL_0011
IL_000f: ldc.i4.0
IL_0010: stloc.0
IL_0011: ldloc.0
IL_0012: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_11_HasValue_NullableAnalysis()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
public bool HasValue => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s.HasValue)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S1 s)
{
if (!s.HasValue)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(200, 19),
// (300,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(300, 19)
);
}
[Fact]
public void NonBoxingUnionMatching_12_HasValue_NullableAnalysis_Generic()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1<T>
{
public S1(T x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
public bool HasValue => throw null!;
}
class Program
{
static void Test2(S1<int> s)
{
if (s.HasValue)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S1<int> s)
{
if (!s.HasValue)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(200, 19),
// (300,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(300, 19)
);
}
[Fact]
public void NonBoxingUnionMatching_13_HasValue_NullableAnalysis_Generic()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1<T>
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
public T HasValue => throw null!;
}
class Program
{
static void Test2(S1<bool> s)
{
if (s.HasValue)
{
#line 100
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S1<bool> s)
{
if (!s.HasValue)
{
#line 300
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(100, 19),
// (200,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(200, 19),
// (300,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(300, 19),
// (400,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(400, 19)
);
}
[Fact]
public void NonBoxingUnionMatching_14_NullableAnalysis_ValuePropertyOfTheInterfaceIsTargetedNotValuePropertyOfTheType()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
public bool HasValue => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s.HasValue)
{
#line 100
s.Value.ToString();
}
else
{
#line 200
s.Value.ToString();
}
}
static void Test4(S1 s)
{
if (!s.HasValue)
{
#line 300
s.Value.ToString();
}
else
{
#line 400
s.Value.ToString();
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,13): warning CS8602: Dereference of a possibly null reference.
// s.Value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "s.Value").WithLocation(200, 13),
// (300,13): warning CS8602: Dereference of a possibly null reference.
// s.Value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "s.Value").WithLocation(300, 13)
);
}
[Fact]
public void NonBoxingUnionMatching_15_TryGetValue_Struct()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
public bool TryGetValue(out int x) { if (_value is int v) { x = v; return true; } x = 0; return false; }
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test1(new S1(""a"")));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(""b"")));
}
static bool Test1(S1 u)
{
return u is int;
}
static bool Test2(S1 u)
{
return u is not int;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalseTrueTrue").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 10 (0xa)
.maxstack 2
.locals init (int V_0)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out int)""
IL_0009: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 13 (0xd)
.maxstack 2
.locals init (int V_0)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out int)""
IL_0009: ldc.i4.0
IL_000a: ceq
IL_000c: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_16_TryGetValue_Class()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
public bool TryGetValue(out int x) { if (_value is int v) { x = v; return true; } x = 0; return false; }
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1(null)));
System.Console.Write(Test1(new S1(""a"")));
System.Console.Write(Test1(null));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1(null)));
System.Console.Write(Test2(new S1(""b"")));
System.Console.Write(Test2(null));
}
static bool Test1(S1 u)
{
return u is int;
}
static bool Test2(S1 u)
{
return u is not int;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalseFalseTrueTrueFalse").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 14 (0xe)
.maxstack 2
.locals init (int V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000c
IL_0003: ldarg.0
IL_0004: ldloca.s V_0
IL_0006: callvirt ""bool S1.TryGetValue(out int)""
IL_000b: ret
IL_000c: ldc.i4.0
IL_000d: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 17 (0x11)
.maxstack 2
.locals init (int V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_000f
IL_0003: ldarg.0
IL_0004: ldloca.s V_0
IL_0006: callvirt ""bool S1.TryGetValue(out int)""
IL_000b: ldc.i4.0
IL_000c: ceq
IL_000e: ret
IL_000f: ldc.i4.0
IL_0010: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_17_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(object x) { _value = x; }
public object Value => _value;
public bool TryGetValue(out object x) { x = _value; return x != null; }
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test1(new S1(""a"")));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(""b"")));
}
static bool Test1(S1 u)
{
return u is object;
}
static bool Test2(S1 u)
{
return u is not object;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseTrueFalseTrueFalse").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 10 (0xa)
.maxstack 2
.locals init (object V_0)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out object)""
IL_0009: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 13 (0xd)
.maxstack 2
.locals init (object V_0)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out object)""
IL_0009: ldc.i4.0
IL_000a: ceq
IL_000c: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_18_TryGetValue_Plus_HasValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(object x) { _value = x; }
public object Value => _value;
public bool TryGetValue(out object x) { x = _value; return x != null; }
public bool HasValue => _value != null;
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test1(new S1(""a"")));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(""b"")));
}
static bool Test1(S1 u)
{
return u is object;
}
static bool Test2(S1 u)
{
return u is not object;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseTrueFalseTrueFalse").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 8 (0x8)
.maxstack 1
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1.HasValue.get""
IL_0007: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 11 (0xb)
.maxstack 2
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1.HasValue.get""
IL_0007: ldc.i4.0
IL_0008: ceq
IL_000a: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_19_HasValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(object x) { _value = x; }
public object Value => _value;
public bool HasValue => _value != null;
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test1(new S1(""a"")));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(""b"")));
}
static bool Test1(S1 u)
{
return u is object;
}
static bool Test2(S1 u)
{
return u is not object;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseTrueFalseTrueFalse").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 8 (0x8)
.maxstack 1
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1.HasValue.get""
IL_0007: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 11 (0xb)
.maxstack 2
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1.HasValue.get""
IL_0007: ldc.i4.0
IL_0008: ceq
IL_000a: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_20_HasValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(object x) { _value = x; }
public object Value => _value;
public bool HasValue => _value != null;
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test1(new S1(""a"")));
}
static int Test1(S1 u)
{
return u switch { null => 0, int => 1, _ => 2};
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "102").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 37 (0x25)
.maxstack 1
.locals init (int V_0)
IL_0000: ldarga.s V_0
IL_0002: call ""bool S1.HasValue.get""
IL_0007: brfalse.s IL_0019
IL_0009: ldarga.s V_0
IL_000b: call ""object S1.Value.get""
IL_0010: isinst ""int""
IL_0015: brtrue.s IL_001d
IL_0017: br.s IL_0021
IL_0019: ldc.i4.0
IL_001a: stloc.0
IL_001b: br.s IL_0023
IL_001d: ldc.i4.1
IL_001e: stloc.0
IL_001f: br.s IL_0023
IL_0021: ldc.i4.2
IL_0022: stloc.0
IL_0023: ldloc.0
IL_0024: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_21_TryGetValue_Struct()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
public bool TryGetValue(out string x) { x = _value as string; return x != null; }
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test1(new S1(""a"")));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(""b"")));
}
static bool Test1(S1 u)
{
return u is ""a"";
}
static bool Test2(S1 u)
{
return u is not ""b"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "FalseFalseTrueTrueTrueFalse").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 25 (0x19)
.maxstack 2
.locals init (string V_0)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out string)""
IL_0009: brfalse.s IL_0017
IL_000b: ldloc.0
IL_000c: ldstr ""a""
IL_0011: call ""bool string.op_Equality(string, string)""
IL_0016: ret
IL_0017: ldc.i4.0
IL_0018: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 32 (0x20)
.maxstack 2
.locals init (string V_0,
bool V_1)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out string)""
IL_0009: brfalse.s IL_0018
IL_000b: ldloc.0
IL_000c: ldstr ""b""
IL_0011: call ""bool string.op_Equality(string, string)""
IL_0016: brtrue.s IL_001c
IL_0018: ldc.i4.1
IL_0019: stloc.1
IL_001a: br.s IL_001e
IL_001c: ldc.i4.0
IL_001d: stloc.1
IL_001e: ldloc.1
IL_001f: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_22_TryGetValue_Class()
{
var src = @"
[System.Runtime.CompilerServices.Union]
class S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
public bool TryGetValue(out string x) { x = _value as string; return x != null; }
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1(null)));
System.Console.Write(Test1(new S1(""a"")));
System.Console.Write(Test1(null));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1(null)));
System.Console.Write(Test2(new S1(""b"")));
System.Console.Write(Test2(null));
}
static bool Test1(S1 u)
{
return u is ""a"";
}
static bool Test2(S1 u)
{
return u is not ""b"";
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "FalseFalseTrueFalseTrueTrueFalseFalse").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 27 (0x1b)
.maxstack 2
.locals init (string V_0)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_0019
IL_0003: ldarg.0
IL_0004: ldloca.s V_0
IL_0006: callvirt ""bool S1.TryGetValue(out string)""
IL_000b: brfalse.s IL_0019
IL_000d: ldloc.0
IL_000e: ldstr ""a""
IL_0013: call ""bool string.op_Equality(string, string)""
IL_0018: ret
IL_0019: ldc.i4.0
IL_001a: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 34 (0x22)
.maxstack 2
.locals init (string V_0,
bool V_1)
IL_0000: ldarg.0
IL_0001: brfalse.s IL_001e
IL_0003: ldarg.0
IL_0004: ldloca.s V_0
IL_0006: callvirt ""bool S1.TryGetValue(out string)""
IL_000b: brfalse.s IL_001a
IL_000d: ldloc.0
IL_000e: ldstr ""b""
IL_0013: call ""bool string.op_Equality(string, string)""
IL_0018: brtrue.s IL_001e
IL_001a: ldc.i4.1
IL_001b: stloc.1
IL_001c: br.s IL_0020
IL_001e: ldc.i4.0
IL_001f: stloc.1
IL_0020: ldloc.1
IL_0021: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_23_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
public bool TryGetValue(out int x) { if (_value is int v) { x = v; return true; } x = 0; return false; }
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(Test1((new S1(), 1)));
System.Console.Write(Test1((new S1(""a""), 1)));
}
static bool Test1((S1, int) u)
{
return u is (int, 1) or (int, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseFalse").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 39 (0x27)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out int)""
IL_0010: brfalse.s IL_0023
IL_0012: ldarg.0
IL_0013: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0018: stloc.2
IL_0019: ldloc.2
IL_001a: ldc.i4.1
IL_001b: sub
IL_001c: ldc.i4.1
IL_001d: bgt.un.s IL_0023
IL_001f: ldc.i4.1
IL_0020: stloc.3
IL_0021: br.s IL_0025
IL_0023: ldc.i4.0
IL_0024: stloc.3
IL_0025: ldloc.3
IL_0026: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_24_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
}
static bool Test1((S1, int) u)
{
return u is (null, 2) or (int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "get_Value TryGetValue True; get_Value True; get_Value False; get_Value TryGetValue False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 55 (0x37)
.maxstack 2
.locals init (S1 V_0,
int V_1,
bool V_2)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""object S1.Value.get""
IL_000e: brtrue.s IL_001b
IL_0010: ldarg.0
IL_0011: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0016: ldc.i4.2
IL_0017: beq.s IL_002f
IL_0019: br.s IL_0033
IL_001b: ldloca.s V_0
IL_001d: ldloca.s V_1
IL_001f: call ""bool S1.TryGetValue(out int)""
IL_0024: brfalse.s IL_0033
IL_0026: ldarg.0
IL_0027: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002c: ldc.i4.1
IL_002d: bne.un.s IL_0033
IL_002f: ldc.i4.1
IL_0030: stloc.2
IL_0031: br.s IL_0035
IL_0033: ldc.i4.0
IL_0034: stloc.2
IL_0035: ldloc.2
IL_0036: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_25_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
}
static bool Test1((S1, int) u)
{
return u is (int, 1) or (null, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TryGetValue True; TryGetValue get_Value True; TryGetValue get_Value False; TryGetValue get_Value False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 55 (0x37)
.maxstack 2
.locals init (S1 V_0,
int V_1,
bool V_2)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out int)""
IL_0010: brfalse.s IL_001d
IL_0012: ldarg.0
IL_0013: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0018: ldc.i4.1
IL_0019: beq.s IL_002f
IL_001b: br.s IL_0033
IL_001d: ldloca.s V_0
IL_001f: call ""object S1.Value.get""
IL_0024: brtrue.s IL_0033
IL_0026: ldarg.0
IL_0027: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002c: ldc.i4.2
IL_002d: bne.un.s IL_0033
IL_002f: ldc.i4.1
IL_0030: stloc.2
IL_0031: br.s IL_0035
IL_0033: ldc.i4.0
IL_0034: stloc.2
IL_0035: ldloc.2
IL_0036: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_26_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), -1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (not null, 2) or (int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "get_Value TryGetValue True; get_Value TryGetValue False; get_Value False; get_Value False; get_Value TryGetValue False; get_Value True").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 50 (0x32)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""object S1.Value.get""
IL_000e: brfalse.s IL_002e
IL_0010: ldarg.0
IL_0011: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0016: stloc.1
IL_0017: ldloc.1
IL_0018: ldc.i4.2
IL_0019: beq.s IL_002a
IL_001b: ldloca.s V_0
IL_001d: ldloca.s V_2
IL_001f: call ""bool S1.TryGetValue(out int)""
IL_0024: brfalse.s IL_002e
IL_0026: ldloc.1
IL_0027: ldc.i4.1
IL_0028: bne.un.s IL_002e
IL_002a: ldc.i4.1
IL_002b: stloc.3
IL_002c: br.s IL_0030
IL_002e: ldc.i4.0
IL_002f: stloc.3
IL_0030: ldloc.3
IL_0031: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_27_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), -1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (int, 1) or (not null, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TryGetValue True; TryGetValue False; TryGetValue get_Value False; TryGetValue get_Value False; TryGetValue get_Value False; TryGetValue get_Value True").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 59 (0x3b)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out int)""
IL_0010: brfalse.s IL_001f
IL_0012: ldarg.0
IL_0013: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0018: stloc.2
IL_0019: ldloc.2
IL_001a: ldc.i4.1
IL_001b: beq.s IL_0033
IL_001d: br.s IL_002f
IL_001f: ldloca.s V_0
IL_0021: call ""object S1.Value.get""
IL_0026: brfalse.s IL_0037
IL_0028: ldarg.0
IL_0029: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002e: stloc.2
IL_002f: ldloc.2
IL_0030: ldc.i4.2
IL_0031: bne.un.s IL_0037
IL_0033: ldc.i4.1
IL_0034: stloc.3
IL_0035: br.s IL_0039
IL_0037: ldc.i4.0
IL_0038: stloc.3
IL_0039: ldloc.3
IL_003a: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_28_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (null, 2) or (not int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "get_Value TryGetValue False; get_Value True; get_Value False; get_Value True; get_Value TryGetValue True; get_Value TryGetValue False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 59 (0x3b)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""object S1.Value.get""
IL_000e: brtrue.s IL_001d
IL_0010: ldarg.0
IL_0011: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0016: stloc.1
IL_0017: ldloc.1
IL_0018: ldc.i4.2
IL_0019: beq.s IL_0033
IL_001b: br.s IL_002f
IL_001d: ldloca.s V_0
IL_001f: ldloca.s V_2
IL_0021: call ""bool S1.TryGetValue(out int)""
IL_0026: brtrue.s IL_0037
IL_0028: ldarg.0
IL_0029: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002e: stloc.1
IL_002f: ldloc.1
IL_0030: ldc.i4.1
IL_0031: bne.un.s IL_0037
IL_0033: ldc.i4.1
IL_0034: stloc.3
IL_0035: br.s IL_0039
IL_0037: ldc.i4.0
IL_0038: stloc.3
IL_0039: ldloc.3
IL_003a: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_29_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (not int, 1) or (null, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TryGetValue False; TryGetValue get_Value True; TryGetValue get_Value False; TryGetValue True; TryGetValue True; TryGetValue get_Value False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 50 (0x32)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out int)""
IL_0010: brtrue.s IL_002e
IL_0012: ldarg.0
IL_0013: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0018: stloc.2
IL_0019: ldloc.2
IL_001a: ldc.i4.1
IL_001b: beq.s IL_002a
IL_001d: ldloca.s V_0
IL_001f: call ""object S1.Value.get""
IL_0024: brtrue.s IL_002e
IL_0026: ldloc.2
IL_0027: ldc.i4.2
IL_0028: bne.un.s IL_002e
IL_002a: ldc.i4.1
IL_002b: stloc.3
IL_002c: br.s IL_0030
IL_002e: ldc.i4.0
IL_002f: stloc.3
IL_0030: ldloc.3
IL_0031: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_30_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
}
static bool Test1((S1, int) u)
{
return u is (null, 2) or (int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "HasValue TryGetValue True; HasValue True; HasValue False; HasValue TryGetValue False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 55 (0x37)
.maxstack 2
.locals init (S1 V_0,
int V_1,
bool V_2)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""bool S1.HasValue.get""
IL_000e: brtrue.s IL_001b
IL_0010: ldarg.0
IL_0011: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0016: ldc.i4.2
IL_0017: beq.s IL_002f
IL_0019: br.s IL_0033
IL_001b: ldloca.s V_0
IL_001d: ldloca.s V_1
IL_001f: call ""bool S1.TryGetValue(out int)""
IL_0024: brfalse.s IL_0033
IL_0026: ldarg.0
IL_0027: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002c: ldc.i4.1
IL_002d: bne.un.s IL_0033
IL_002f: ldc.i4.1
IL_0030: stloc.2
IL_0031: br.s IL_0035
IL_0033: ldc.i4.0
IL_0034: stloc.2
IL_0035: ldloc.2
IL_0036: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_31_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
}
static bool Test1((S1, int) u)
{
return u is (int, 1) or (null, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TryGetValue True; TryGetValue HasValue True; TryGetValue HasValue False; TryGetValue HasValue False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 55 (0x37)
.maxstack 2
.locals init (S1 V_0,
int V_1,
bool V_2)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out int)""
IL_0010: brfalse.s IL_001d
IL_0012: ldarg.0
IL_0013: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0018: ldc.i4.1
IL_0019: beq.s IL_002f
IL_001b: br.s IL_0033
IL_001d: ldloca.s V_0
IL_001f: call ""bool S1.HasValue.get""
IL_0024: brtrue.s IL_0033
IL_0026: ldarg.0
IL_0027: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002c: ldc.i4.2
IL_002d: bne.un.s IL_0033
IL_002f: ldc.i4.1
IL_0030: stloc.2
IL_0031: br.s IL_0035
IL_0033: ldc.i4.0
IL_0034: stloc.2
IL_0035: ldloc.2
IL_0036: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_32_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), -1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (not null, 2) or (int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "HasValue TryGetValue True; HasValue TryGetValue False; HasValue False; HasValue False; HasValue TryGetValue False; HasValue True").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 50 (0x32)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""bool S1.HasValue.get""
IL_000e: brfalse.s IL_002e
IL_0010: ldarg.0
IL_0011: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0016: stloc.1
IL_0017: ldloc.1
IL_0018: ldc.i4.2
IL_0019: beq.s IL_002a
IL_001b: ldloca.s V_0
IL_001d: ldloca.s V_2
IL_001f: call ""bool S1.TryGetValue(out int)""
IL_0024: brfalse.s IL_002e
IL_0026: ldloc.1
IL_0027: ldc.i4.1
IL_0028: bne.un.s IL_002e
IL_002a: ldc.i4.1
IL_002b: stloc.3
IL_002c: br.s IL_0030
IL_002e: ldc.i4.0
IL_002f: stloc.3
IL_0030: ldloc.3
IL_0031: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_33_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), -1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (int, 1) or (not null, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TryGetValue True; TryGetValue False; TryGetValue HasValue False; TryGetValue HasValue False; TryGetValue HasValue False; TryGetValue HasValue True").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 59 (0x3b)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out int)""
IL_0010: brfalse.s IL_001f
IL_0012: ldarg.0
IL_0013: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0018: stloc.2
IL_0019: ldloc.2
IL_001a: ldc.i4.1
IL_001b: beq.s IL_0033
IL_001d: br.s IL_002f
IL_001f: ldloca.s V_0
IL_0021: call ""bool S1.HasValue.get""
IL_0026: brfalse.s IL_0037
IL_0028: ldarg.0
IL_0029: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002e: stloc.2
IL_002f: ldloc.2
IL_0030: ldc.i4.2
IL_0031: bne.un.s IL_0037
IL_0033: ldc.i4.1
IL_0034: stloc.3
IL_0035: br.s IL_0039
IL_0037: ldc.i4.0
IL_0038: stloc.3
IL_0039: ldloc.3
IL_003a: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_34_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (null, 2) or (not int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "HasValue TryGetValue False; HasValue True; HasValue False; HasValue True; HasValue TryGetValue True; HasValue TryGetValue False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 59 (0x3b)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""bool S1.HasValue.get""
IL_000e: brtrue.s IL_001d
IL_0010: ldarg.0
IL_0011: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0016: stloc.1
IL_0017: ldloc.1
IL_0018: ldc.i4.2
IL_0019: beq.s IL_0033
IL_001b: br.s IL_002f
IL_001d: ldloca.s V_0
IL_001f: ldloca.s V_2
IL_0021: call ""bool S1.TryGetValue(out int)""
IL_0026: brtrue.s IL_0037
IL_0028: ldarg.0
IL_0029: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002e: stloc.1
IL_002f: ldloc.1
IL_0030: ldc.i4.1
IL_0031: bne.un.s IL_0037
IL_0033: ldc.i4.1
IL_0034: stloc.3
IL_0035: br.s IL_0039
IL_0037: ldc.i4.0
IL_0038: stloc.3
IL_0039: ldloc.3
IL_003a: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_35_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (not int, 1) or (null, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TryGetValue False; TryGetValue HasValue True; TryGetValue HasValue False; TryGetValue True; TryGetValue True; TryGetValue HasValue False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 50 (0x32)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out int)""
IL_0010: brtrue.s IL_002e
IL_0012: ldarg.0
IL_0013: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0018: stloc.2
IL_0019: ldloc.2
IL_001a: ldc.i4.1
IL_001b: beq.s IL_002a
IL_001d: ldloca.s V_0
IL_001f: call ""bool S1.HasValue.get""
IL_0024: brtrue.s IL_002e
IL_0026: ldloc.2
IL_0027: ldc.i4.2
IL_0028: bne.un.s IL_002e
IL_002a: ldc.i4.1
IL_002b: stloc.3
IL_002c: br.s IL_0030
IL_002e: ldc.i4.0
IL_002f: stloc.3
IL_0030: ldloc.3
IL_0031: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_36_HasValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
}
static bool Test1((S1, int) u)
{
return u is (null, 2) or (int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "HasValue get_Value True; HasValue True; HasValue False; HasValue get_Value False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 58 (0x3a)
.maxstack 2
.locals init (S1 V_0,
bool V_1)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""bool S1.HasValue.get""
IL_000e: brtrue.s IL_001b
IL_0010: ldarg.0
IL_0011: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0016: ldc.i4.2
IL_0017: beq.s IL_0032
IL_0019: br.s IL_0036
IL_001b: ldloca.s V_0
IL_001d: call ""object S1.Value.get""
IL_0022: isinst ""int""
IL_0027: brfalse.s IL_0036
IL_0029: ldarg.0
IL_002a: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002f: ldc.i4.1
IL_0030: bne.un.s IL_0036
IL_0032: ldc.i4.1
IL_0033: stloc.1
IL_0034: br.s IL_0038
IL_0036: ldc.i4.0
IL_0037: stloc.1
IL_0038: ldloc.1
IL_0039: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_37_HasValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
}
static bool Test1((S1, int) u)
{
return u is (int, 1) or (null, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "get_Value True; get_Value HasValue True; get_Value HasValue False; get_Value HasValue False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 58 (0x3a)
.maxstack 2
.locals init (S1 V_0,
bool V_1)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""object S1.Value.get""
IL_000e: isinst ""int""
IL_0013: brfalse.s IL_0020
IL_0015: ldarg.0
IL_0016: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_001b: ldc.i4.1
IL_001c: beq.s IL_0032
IL_001e: br.s IL_0036
IL_0020: ldloca.s V_0
IL_0022: call ""bool S1.HasValue.get""
IL_0027: brtrue.s IL_0036
IL_0029: ldarg.0
IL_002a: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002f: ldc.i4.2
IL_0030: bne.un.s IL_0036
IL_0032: ldc.i4.1
IL_0033: stloc.1
IL_0034: br.s IL_0038
IL_0036: ldc.i4.0
IL_0037: stloc.1
IL_0038: ldloc.1
IL_0039: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_38_HasValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), -1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (not null, 2) or (int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "HasValue get_Value True; HasValue get_Value False; HasValue False; HasValue False; HasValue get_Value False; HasValue True").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 53 (0x35)
.maxstack 2
.locals init (S1 V_0,
int V_1,
bool V_2)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""bool S1.HasValue.get""
IL_000e: brfalse.s IL_0031
IL_0010: ldarg.0
IL_0011: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0016: stloc.1
IL_0017: ldloc.1
IL_0018: ldc.i4.2
IL_0019: beq.s IL_002d
IL_001b: ldloca.s V_0
IL_001d: call ""object S1.Value.get""
IL_0022: isinst ""int""
IL_0027: brfalse.s IL_0031
IL_0029: ldloc.1
IL_002a: ldc.i4.1
IL_002b: bne.un.s IL_0031
IL_002d: ldc.i4.1
IL_002e: stloc.2
IL_002f: br.s IL_0033
IL_0031: ldc.i4.0
IL_0032: stloc.2
IL_0033: ldloc.2
IL_0034: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_39_HasValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), -1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (int, 1) or (not null, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "get_Value True; get_Value False; get_Value HasValue False; get_Value HasValue False; get_Value HasValue False; get_Value HasValue True").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 62 (0x3e)
.maxstack 2
.locals init (S1 V_0,
int V_1,
bool V_2)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""object S1.Value.get""
IL_000e: isinst ""int""
IL_0013: brfalse.s IL_0022
IL_0015: ldarg.0
IL_0016: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_001b: stloc.1
IL_001c: ldloc.1
IL_001d: ldc.i4.1
IL_001e: beq.s IL_0036
IL_0020: br.s IL_0032
IL_0022: ldloca.s V_0
IL_0024: call ""bool S1.HasValue.get""
IL_0029: brfalse.s IL_003a
IL_002b: ldarg.0
IL_002c: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0031: stloc.1
IL_0032: ldloc.1
IL_0033: ldc.i4.2
IL_0034: bne.un.s IL_003a
IL_0036: ldc.i4.1
IL_0037: stloc.2
IL_0038: br.s IL_003c
IL_003a: ldc.i4.0
IL_003b: stloc.2
IL_003c: ldloc.2
IL_003d: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_40_HasValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (null, 2) or (not int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "HasValue get_Value False; HasValue True; HasValue False; HasValue True; HasValue get_Value True; HasValue get_Value False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 62 (0x3e)
.maxstack 2
.locals init (S1 V_0,
int V_1,
bool V_2)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""bool S1.HasValue.get""
IL_000e: brtrue.s IL_001d
IL_0010: ldarg.0
IL_0011: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0016: stloc.1
IL_0017: ldloc.1
IL_0018: ldc.i4.2
IL_0019: beq.s IL_0036
IL_001b: br.s IL_0032
IL_001d: ldloca.s V_0
IL_001f: call ""object S1.Value.get""
IL_0024: isinst ""int""
IL_0029: brtrue.s IL_003a
IL_002b: ldarg.0
IL_002c: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0031: stloc.1
IL_0032: ldloc.1
IL_0033: ldc.i4.1
IL_0034: bne.un.s IL_003a
IL_0036: ldc.i4.1
IL_0037: stloc.2
IL_0038: br.s IL_003c
IL_003a: ldc.i4.0
IL_003b: stloc.2
IL_003c: ldloc.2
IL_003d: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_41_HasValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
}
static bool Test1((S1, int) u)
{
return u is (not int, 1) or (null, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "get_Value False; get_Value HasValue True; get_Value HasValue False; get_Value True; get_Value True; get_Value HasValue False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 53 (0x35)
.maxstack 2
.locals init (S1 V_0,
int V_1,
bool V_2)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""object S1.Value.get""
IL_000e: isinst ""int""
IL_0013: brtrue.s IL_0031
IL_0015: ldarg.0
IL_0016: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_001b: stloc.1
IL_001c: ldloc.1
IL_001d: ldc.i4.1
IL_001e: beq.s IL_002d
IL_0020: ldloca.s V_0
IL_0022: call ""bool S1.HasValue.get""
IL_0027: brtrue.s IL_0031
IL_0029: ldloc.1
IL_002a: ldc.i4.2
IL_002b: bne.un.s IL_0031
IL_002d: ldc.i4.1
IL_002e: stloc.2
IL_002f: br.s IL_0033
IL_0031: ldc.i4.0
IL_0032: stloc.2
IL_0033: ldloc.2
IL_0034: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_42_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue(int) "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
public bool TryGetValue(out string x)
{
System.Console.Write(""TryGetValue(string) "");
x = _value as string;
return x != null;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 3)));
}
static bool Test1((S1, int) u)
{
return u is (string, 2) or (int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TryGetValue(string) TryGetValue(int) True; TryGetValue(string) TryGetValue(int) False; TryGetValue(string) TryGetValue(int) False; TryGetValue(string) TryGetValue(int) False; TryGetValue(string) TryGetValue(int) False; TryGetValue(string) TryGetValue(int) False; TryGetValue(string) False; TryGetValue(string) True; TryGetValue(string) False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 57 (0x39)
.maxstack 2
.locals init (S1 V_0,
string V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out string)""
IL_0010: brfalse.s IL_001d
IL_0012: ldarg.0
IL_0013: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0018: ldc.i4.2
IL_0019: beq.s IL_0031
IL_001b: br.s IL_0035
IL_001d: ldloca.s V_0
IL_001f: ldloca.s V_2
IL_0021: call ""bool S1.TryGetValue(out int)""
IL_0026: brfalse.s IL_0035
IL_0028: ldarg.0
IL_0029: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002e: ldc.i4.1
IL_002f: bne.un.s IL_0035
IL_0031: ldc.i4.1
IL_0032: stloc.3
IL_0033: br.s IL_0037
IL_0035: ldc.i4.0
IL_0036: stloc.3
IL_0037: ldloc.3
IL_0038: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_43_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out string x)
{
System.Console.Write(""TryGetValue(string) "");
x = _value as string;
return x != null;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 3)));
}
static bool Test1((S1, int) u)
{
return u is (string, 2) or (int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TryGetValue(string) get_Value True; TryGetValue(string) get_Value False; TryGetValue(string) get_Value False; TryGetValue(string) get_Value False; TryGetValue(string) get_Value False; TryGetValue(string) get_Value False; TryGetValue(string) False; TryGetValue(string) True; TryGetValue(string) False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 60 (0x3c)
.maxstack 2
.locals init (S1 V_0,
string V_1,
bool V_2)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out string)""
IL_0010: brfalse.s IL_001d
IL_0012: ldarg.0
IL_0013: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0018: ldc.i4.2
IL_0019: beq.s IL_0034
IL_001b: br.s IL_0038
IL_001d: ldloca.s V_0
IL_001f: call ""object S1.Value.get""
IL_0024: isinst ""int""
IL_0029: brfalse.s IL_0038
IL_002b: ldarg.0
IL_002c: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0031: ldc.i4.1
IL_0032: bne.un.s IL_0038
IL_0034: ldc.i4.1
IL_0035: stloc.2
IL_0036: br.s IL_003a
IL_0038: ldc.i4.0
IL_0039: stloc.2
IL_003a: ldloc.2
IL_003b: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_44_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue(int) "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 3)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 3)));
}
static bool Test1((S1, int) u)
{
return u is (string, 2) or (int, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "get_Value TryGetValue(int) True; get_Value TryGetValue(int) False; get_Value TryGetValue(int) False; get_Value TryGetValue(int) False; get_Value TryGetValue(int) False; get_Value TryGetValue(int) False; get_Value False; get_Value True; get_Value False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 60 (0x3c)
.maxstack 2
.locals init (S1 V_0,
int V_1,
bool V_2)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""object S1.Value.get""
IL_000e: isinst ""string""
IL_0013: brfalse.s IL_0020
IL_0015: ldarg.0
IL_0016: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_001b: ldc.i4.2
IL_001c: beq.s IL_0034
IL_001e: br.s IL_0038
IL_0020: ldloca.s V_0
IL_0022: ldloca.s V_1
IL_0024: call ""bool S1.TryGetValue(out int)""
IL_0029: brfalse.s IL_0038
IL_002b: ldarg.0
IL_002c: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0031: ldc.i4.1
IL_0032: bne.un.s IL_0038
IL_0034: ldc.i4.1
IL_0035: stloc.2
IL_0036: br.s IL_003a
IL_0038: ldc.i4.0
IL_0039: stloc.2
IL_003a: ldloc.2
IL_003b: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_45_TryGetValue()
{
var src = @"
interface I1;
class C11;
class C12;
class C13 : C12, I1;
class C14 : I1;
class C15 : I1;
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(I1 x) { _value = x; }
public S1(C11 x) { _value = x; }
public S1(C12 x) { _value = x; }
public S1(C14 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out I1 x)
{
System.Console.Write(""TryGetValue(I1) "");
x = _value as I1;
return x != null;
}
public bool TryGetValue(out C12 x)
{
System.Console.Write(""TryGetValue(C12) "");
x = _value as C12;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1((C12)new C13()), new S1(new C14()), new S1(new C15())];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (C12 and I1, 2) or (I1, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Item1; [1]
[1]: TryGetValue(C12): (Item1, ReturnItem) t2 = t1; [2]
[2]: t2.ReturnItem == True ? [3] : [7]
[3]: t3 = (C12)t2.Item1; [4]
[4]: t3 is I1 ? [5] : [12]
[5]: t4 = t0.Item2; [6]
[6]: t4 == 2 ? [11] : [10]
[7]: TryGetValue(I1): (Item1, ReturnItem) t5 = t1; [8]
[8]: t5.ReturnItem == True ? [9] : [12]
[9]: t4 = t0.Item2; [10]
[10]: t4 == 1 ? [11] : [12]
[11]: leaf <isPatternSuccess> `(C12 and I1, 2) or (I1, 1)`
[12]: leaf <isPatternFailure> `u is (C12 and I1, 2) or (I1, 1)`
",
forLowering: true);
var verifier = CompileAndVerify(
comp,
expectedOutput: @"
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12)
False
TryGetValue(C12)
False
TryGetValue(C12)
False
TryGetValue(C12)
True
TryGetValue(C12)
True
TryGetValue(C12)
False
TryGetValue(C12) TryGetValue(I1)
True
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
True
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 72 (0x48)
.maxstack 2
.locals init (S1 V_0,
C12 V_1,
int V_2,
I1 V_3,
bool V_4)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out C12)""
IL_0010: brfalse.s IL_0027
IL_0012: ldloc.1
IL_0013: isinst ""I1""
IL_0018: brfalse.s IL_0042
IL_001a: ldarg.0
IL_001b: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0020: stloc.2
IL_0021: ldloc.2
IL_0022: ldc.i4.2
IL_0023: beq.s IL_003d
IL_0025: br.s IL_0039
IL_0027: ldloca.s V_0
IL_0029: ldloca.s V_3
IL_002b: call ""bool S1.TryGetValue(out I1)""
IL_0030: brfalse.s IL_0042
IL_0032: ldarg.0
IL_0033: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0038: stloc.2
IL_0039: ldloc.2
IL_003a: ldc.i4.1
IL_003b: bne.un.s IL_0042
IL_003d: ldc.i4.1
IL_003e: stloc.s V_4
IL_0040: br.s IL_0045
IL_0042: ldc.i4.0
IL_0043: stloc.s V_4
IL_0045: ldloc.s V_4
IL_0047: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_46_TryGetValue()
{
var src = @"
interface I1;
class C11;
class C12;
class C13 : C12, I1;
class C14 : I1;
class C15 : I1;
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(I1 x) { _value = x; }
public S1(C11 x) { _value = x; }
public S1(C12 x) { _value = x; }
public S1(C14 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out I1 x)
{
System.Console.Write(""TryGetValue(I1) "");
x = _value as I1;
return x != null;
}
public bool TryGetValue(out C12 x)
{
System.Console.Write(""TryGetValue(C12) "");
x = _value as C12;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1((C12)new C13()), new S1(new C14()), new S1(new C15())];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (I1, 1) or (C12 and I1, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Item1; [1]
[1]: TryGetValue(I1): (Item1, ReturnItem) t2 = t1; [2]
[2]: t2.ReturnItem == True ? [3] : [9]
[3]: t3 = t0.Item2; [4]
[4]: t3 == 1 ? [8] : [5]
[5]: TryGetValue(C12): (Item1, ReturnItem) t4 = t1; [6]
[6]: t4.ReturnItem == True ? [7] : [9]
[7]: t3 == 2 ? [8] : [9]
[8]: leaf <isPatternSuccess> `(I1, 1) or (C12 and I1, 2)`
[9]: leaf <isPatternFailure> `u is (I1, 1) or (C12 and I1, 2)`
",
forLowering: true);
var verifier = CompileAndVerify(
comp,
expectedOutput: @"
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
True
TryGetValue(I1) TryGetValue(C12)
True
TryGetValue(I1) TryGetValue(C12)
False
TryGetValue(I1)
True
TryGetValue(I1) TryGetValue(C12)
False
TryGetValue(I1) TryGetValue(C12)
False
TryGetValue(I1)
True
TryGetValue(I1) TryGetValue(C12)
False
TryGetValue(I1) TryGetValue(C12)
False
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 55 (0x37)
.maxstack 2
.locals init (S1 V_0,
I1 V_1,
int V_2,
C12 V_3,
bool V_4)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out I1)""
IL_0010: brfalse.s IL_0031
IL_0012: ldarg.0
IL_0013: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0018: stloc.2
IL_0019: ldloc.2
IL_001a: ldc.i4.1
IL_001b: beq.s IL_002c
IL_001d: ldloca.s V_0
IL_001f: ldloca.s V_3
IL_0021: call ""bool S1.TryGetValue(out C12)""
IL_0026: brfalse.s IL_0031
IL_0028: ldloc.2
IL_0029: ldc.i4.2
IL_002a: bne.un.s IL_0031
IL_002c: ldc.i4.1
IL_002d: stloc.s V_4
IL_002f: br.s IL_0034
IL_0031: ldc.i4.0
IL_0032: stloc.s V_4
IL_0034: ldloc.s V_4
IL_0036: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_47_TryGetValue()
{
var src = @"
interface I1;
class C11;
class C12;
class C13 : C12, I1;
class C14 : I1;
class C15 : I1;
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(I1 x) { _value = x; }
public S1(C11 x) { _value = x; }
public S1(C12 x) { _value = x; }
public S1(C14 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out I1 x)
{
System.Console.Write(""TryGetValue(I1) "");
x = _value as I1;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1((C12)new C13()), new S1(new C14()), new S1(new C15())];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (C12 and I1, 2) or (I1, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Item1; [1]
[1]: t2 = t1.Value; [2]
[2]: t2 is C12 ? [3] : [7]
[3]: t3 = (C12)t2; [4]
[4]: t3 is I1 ? [5] : [12]
[5]: t4 = t0.Item2; [6]
[6]: t4 == 2 ? [11] : [10]
[7]: TryGetValue(I1): (Item1, ReturnItem) t5 = t1; [8]
[8]: t5.ReturnItem == True ? [9] : [12]
[9]: t4 = t0.Item2; [10]
[10]: t4 == 1 ? [11] : [12]
[11]: leaf <isPatternSuccess> `(C12 and I1, 2) or (I1, 1)`
[12]: leaf <isPatternFailure> `u is (C12 and I1, 2) or (I1, 1)`
",
forLowering: true);
var verifier = CompileAndVerify(
comp,
expectedOutput: @"
get_Value TryGetValue(I1)
False
get_Value TryGetValue(I1)
False
get_Value TryGetValue(I1)
False
get_Value TryGetValue(I1)
False
get_Value TryGetValue(I1)
False
get_Value TryGetValue(I1)
False
get_Value
False
get_Value
False
get_Value
False
get_Value
True
get_Value
True
get_Value
False
get_Value TryGetValue(I1)
True
get_Value TryGetValue(I1)
False
get_Value TryGetValue(I1)
False
get_Value TryGetValue(I1)
True
get_Value TryGetValue(I1)
False
get_Value TryGetValue(I1)
False
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 77 (0x4d)
.maxstack 2
.locals init (S1 V_0,
C12 V_1,
int V_2,
I1 V_3,
bool V_4)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""object S1.Value.get""
IL_000e: isinst ""C12""
IL_0013: stloc.1
IL_0014: ldloc.1
IL_0015: brfalse.s IL_002c
IL_0017: ldloc.1
IL_0018: isinst ""I1""
IL_001d: brfalse.s IL_0047
IL_001f: ldarg.0
IL_0020: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0025: stloc.2
IL_0026: ldloc.2
IL_0027: ldc.i4.2
IL_0028: beq.s IL_0042
IL_002a: br.s IL_003e
IL_002c: ldloca.s V_0
IL_002e: ldloca.s V_3
IL_0030: call ""bool S1.TryGetValue(out I1)""
IL_0035: brfalse.s IL_0047
IL_0037: ldarg.0
IL_0038: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_003d: stloc.2
IL_003e: ldloc.2
IL_003f: ldc.i4.1
IL_0040: bne.un.s IL_0047
IL_0042: ldc.i4.1
IL_0043: stloc.s V_4
IL_0045: br.s IL_004a
IL_0047: ldc.i4.0
IL_0048: stloc.s V_4
IL_004a: ldloc.s V_4
IL_004c: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_48_TryGetValue()
{
var src = @"
interface I1;
class C11;
class C12;
class C13 : C12, I1;
class C14 : I1;
class C15 : I1;
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(I1 x) { _value = x; }
public S1(C11 x) { _value = x; }
public S1(C12 x) { _value = x; }
public S1(C14 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out I1 x)
{
System.Console.Write(""TryGetValue(I1) "");
x = _value as I1;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1((C12)new C13()), new S1(new C14()), new S1(new C15())];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (I1, 1) or (C12 and I1, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(
comp,
expectedOutput: @"
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
False
TryGetValue(I1)
True
TryGetValue(I1) get_Value
True
TryGetValue(I1) get_Value
False
TryGetValue(I1)
True
TryGetValue(I1) get_Value
False
TryGetValue(I1) get_Value
False
TryGetValue(I1)
True
TryGetValue(I1) get_Value
False
TryGetValue(I1) get_Value
False
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 55 (0x37)
.maxstack 2
.locals init (S1 V_0,
I1 V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out I1)""
IL_0010: brfalse.s IL_0033
IL_0012: ldarg.0
IL_0013: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0018: stloc.2
IL_0019: ldloc.2
IL_001a: ldc.i4.1
IL_001b: beq.s IL_002f
IL_001d: ldloca.s V_0
IL_001f: call ""object S1.Value.get""
IL_0024: isinst ""C12""
IL_0029: brfalse.s IL_0033
IL_002b: ldloc.2
IL_002c: ldc.i4.2
IL_002d: bne.un.s IL_0033
IL_002f: ldc.i4.1
IL_0030: stloc.3
IL_0031: br.s IL_0035
IL_0033: ldc.i4.0
IL_0034: stloc.3
IL_0035: ldloc.3
IL_0036: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_49_TryGetValue()
{
var src = @"
interface I1;
class C11;
class C12;
class C13 : C12, I1;
class C14 : I1;
class C15 : I1;
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(I1 x) { _value = x; }
public S1(C11 x) { _value = x; }
public S1(C12 x) { _value = x; }
public S1(C14 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out C12 x)
{
System.Console.Write(""TryGetValue(C12) "");
x = _value as C12;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1((C12)new C13()), new S1(new C14()), new S1(new C15())];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (C12 and I1, 2) or (I1, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Item1; [1]
[1]: TryGetValue(C12): (Item1, ReturnItem) t2 = t1; [2]
[2]: t2.ReturnItem == True ? [3] : [7]
[3]: t3 = (C12)t2.Item1; [4]
[4]: t3 is I1 ? [5] : [12]
[5]: t4 = t0.Item2; [6]
[6]: t4 == 2 ? [11] : [10]
[7]: t5 = t1.Value; [8]
[8]: t5 is I1 ? [9] : [12]
[9]: t4 = t0.Item2; [10]
[10]: t4 == 1 ? [11] : [12]
[11]: leaf <isPatternSuccess> `(C12 and I1, 2) or (I1, 1)`
[12]: leaf <isPatternFailure> `u is (C12 and I1, 2) or (I1, 1)`
",
forLowering: true);
var verifier = CompileAndVerify(
comp,
expectedOutput: @"
TryGetValue(C12) get_Value
False
TryGetValue(C12) get_Value
False
TryGetValue(C12) get_Value
False
TryGetValue(C12) get_Value
False
TryGetValue(C12) get_Value
False
TryGetValue(C12) get_Value
False
TryGetValue(C12)
False
TryGetValue(C12)
False
TryGetValue(C12)
False
TryGetValue(C12)
True
TryGetValue(C12)
True
TryGetValue(C12)
False
TryGetValue(C12) get_Value
True
TryGetValue(C12) get_Value
False
TryGetValue(C12) get_Value
False
TryGetValue(C12) get_Value
True
TryGetValue(C12) get_Value
False
TryGetValue(C12) get_Value
False
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 72 (0x48)
.maxstack 2
.locals init (S1 V_0,
C12 V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out C12)""
IL_0010: brfalse.s IL_0027
IL_0012: ldloc.1
IL_0013: isinst ""I1""
IL_0018: brfalse.s IL_0044
IL_001a: ldarg.0
IL_001b: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0020: stloc.2
IL_0021: ldloc.2
IL_0022: ldc.i4.2
IL_0023: beq.s IL_0040
IL_0025: br.s IL_003c
IL_0027: ldloca.s V_0
IL_0029: call ""object S1.Value.get""
IL_002e: isinst ""I1""
IL_0033: brfalse.s IL_0044
IL_0035: ldarg.0
IL_0036: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_003b: stloc.2
IL_003c: ldloc.2
IL_003d: ldc.i4.1
IL_003e: bne.un.s IL_0044
IL_0040: ldc.i4.1
IL_0041: stloc.3
IL_0042: br.s IL_0046
IL_0044: ldc.i4.0
IL_0045: stloc.3
IL_0046: ldloc.3
IL_0047: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_50_TryGetValue()
{
var src = @"
interface I1;
class C11;
class C12;
class C13 : C12, I1;
class C14 : I1;
class C15 : I1;
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(I1 x) { _value = x; }
public S1(C11 x) { _value = x; }
public S1(C12 x) { _value = x; }
public S1(C14 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out C12 x)
{
System.Console.Write(""TryGetValue(C12) "");
x = _value as C12;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1((C12)new C13()), new S1(new C14()), new S1(new C15())];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (I1, 1) or (C12 and I1, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Item1; [1]
[1]: t2 = t1.Value; [2]
[2]: t2 is I1 ? [3] : [9]
[3]: t3 = t0.Item2; [4]
[4]: t3 == 1 ? [8] : [5]
[5]: TryGetValue(C12): (Item1, ReturnItem) t4 = t1; [6]
[6]: t4.ReturnItem == True ? [7] : [9]
[7]: t3 == 2 ? [8] : [9]
[8]: leaf <isPatternSuccess> `(I1, 1) or (C12 and I1, 2)`
[9]: leaf <isPatternFailure> `u is (I1, 1) or (C12 and I1, 2)`
",
forLowering: true);
var verifier = CompileAndVerify(
comp,
expectedOutput: @"
get_Value
False
get_Value
False
get_Value
False
get_Value
False
get_Value
False
get_Value
False
get_Value
False
get_Value
False
get_Value
False
get_Value
True
get_Value TryGetValue(C12)
True
get_Value TryGetValue(C12)
False
get_Value
True
get_Value TryGetValue(C12)
False
get_Value TryGetValue(C12)
False
get_Value
True
get_Value TryGetValue(C12)
False
get_Value TryGetValue(C12)
False
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 55 (0x37)
.maxstack 2
.locals init (S1 V_0,
int V_1,
C12 V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: call ""object S1.Value.get""
IL_000e: isinst ""I1""
IL_0013: brfalse.s IL_0033
IL_0015: ldarg.0
IL_0016: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_001b: stloc.1
IL_001c: ldloc.1
IL_001d: ldc.i4.1
IL_001e: beq.s IL_002f
IL_0020: ldloca.s V_0
IL_0022: ldloca.s V_2
IL_0024: call ""bool S1.TryGetValue(out C12)""
IL_0029: brfalse.s IL_0033
IL_002b: ldloc.1
IL_002c: ldc.i4.2
IL_002d: bne.un.s IL_0033
IL_002f: ldc.i4.1
IL_0030: stloc.3
IL_0031: br.s IL_0035
IL_0033: ldc.i4.0
IL_0034: stloc.3
IL_0035: ldloc.3
IL_0036: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_51_TryGetValue()
{
var src = @"
interface I1
{
int F {get;}
}
class C11;
class C12;
class C13(int f) : C12, I1
{
public int F => f;
}
class C14(int f) : I1
{
public int F => f;
}
class C15(int f) : I1
{
public int F => f;
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(I1 x) { _value = x; }
public S1(C11 x) { _value = x; }
public S1(C12 x) { _value = x; }
public S1(C14 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out I1 x)
{
System.Console.Write(""TryGetValue(I1) "");
x = _value as I1;
return x != null;
}
public bool TryGetValue(out C12 x)
{
System.Console.Write(""TryGetValue(C12) "");
x = _value as C12;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1((C12)new C13(1)), new S1(new C14(1)), new S1(new C15(1)), new S1((C12)new C13(2)), new S1(new C14(2)), new S1(new C15(2))];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (C12 and I1 and { F: 1 }, 2) or (I1 and { F: 1 }, 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Item1; [1]
[1]: TryGetValue(C12): (Item1, ReturnItem) t2 = t1; [2]
[2]: t2.ReturnItem == True ? [3] : [10]
[3]: t3 = (C12)t2.Item1; [4]
[4]: t3 is I1 ? [5] : [18]
[5]: t4 = (I1)t3; [6]
[6]: t5 = t4.F; [7]
[7]: t5 == 1 ? [8] : [18]
[8]: t6 = t0.Item2; [9]
[9]: t6 == 2 ? [17] : [16]
[10]: TryGetValue(I1): (Item1, ReturnItem) t7 = t1; [11]
[11]: t7.ReturnItem == True ? [12] : [18]
[12]: t4 = (I1)t7.Item1; [13]
[13]: t5 = t4.F; [14]
[14]: t5 == 1 ? [15] : [18]
[15]: t6 = t0.Item2; [16]
[16]: t6 == 1 ? [17] : [18]
[17]: leaf <isPatternSuccess> `(C12 and I1 and { F: 1 }, 2) or (I1 and { F: 1 }, 1)`
[18]: leaf <isPatternFailure> `u is (C12 and I1 and { F: 1 }, 2) or (I1 and { F: 1 }, 1)`
",
forLowering: true);
var verifier = CompileAndVerify(
comp,
expectedOutput: @"
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12)
False
TryGetValue(C12)
False
TryGetValue(C12)
False
TryGetValue(C12)
True
TryGetValue(C12)
True
TryGetValue(C12)
False
TryGetValue(C12) TryGetValue(I1)
True
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
True
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12)
False
TryGetValue(C12)
False
TryGetValue(C12)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
TryGetValue(C12) TryGetValue(I1)
False
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 95 (0x5f)
.maxstack 2
.locals init (S1 V_0,
C12 V_1,
I1 V_2,
int V_3,
I1 V_4,
bool V_5)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out C12)""
IL_0010: brfalse.s IL_0032
IL_0012: ldloc.1
IL_0013: isinst ""I1""
IL_0018: stloc.2
IL_0019: ldloc.2
IL_001a: brfalse.s IL_0059
IL_001c: ldloc.2
IL_001d: callvirt ""int I1.F.get""
IL_0022: ldc.i4.1
IL_0023: bne.un.s IL_0059
IL_0025: ldarg.0
IL_0026: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002b: stloc.3
IL_002c: ldloc.3
IL_002d: ldc.i4.2
IL_002e: beq.s IL_0054
IL_0030: br.s IL_0050
IL_0032: ldloca.s V_0
IL_0034: ldloca.s V_4
IL_0036: call ""bool S1.TryGetValue(out I1)""
IL_003b: brfalse.s IL_0059
IL_003d: ldloc.s V_4
IL_003f: stloc.2
IL_0040: ldloc.2
IL_0041: callvirt ""int I1.F.get""
IL_0046: ldc.i4.1
IL_0047: bne.un.s IL_0059
IL_0049: ldarg.0
IL_004a: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_004f: stloc.3
IL_0050: ldloc.3
IL_0051: ldc.i4.1
IL_0052: bne.un.s IL_0059
IL_0054: ldc.i4.1
IL_0055: stloc.s V_5
IL_0057: br.s IL_005c
IL_0059: ldc.i4.0
IL_005a: stloc.s V_5
IL_005c: ldloc.s V_5
IL_005e: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_52_TryGetValue()
{
var src = @"
using System;
class C11;
class C12 : IComparable
{
public int CompareTo(object obj) => throw null;
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C11 x) { _value = x; }
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(IComparable x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue(int) "");
if (_value is int)
{
x = (int)_value;
return true;
}
x = 0;
return false;
}
public bool TryGetValue(out IComparable x)
{
System.Console.Write(""TryGetValue(IComparable) "");
x = _value as IComparable;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1(1), new S1(""1""), new S1(2), new S1(""2""), new S1(3), new S1(""3"")];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (System.IComparable and int and 1, 2) or (int and (1 or 3), 1);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Item1; [1]
[1]: TryGetValue(System.IComparable): (Item1, ReturnItem) t2 = t1; [2]
[2]: t2.ReturnItem == True ? [3] : [13]
[3]: t3 = (System.IComparable)t2.Item1; [4]
[4]: t3 is int ? [5] : [13]
[5]: t4 = (int)t3; [6]
[6]: t4 == 1 ? [7] : [9]
[7]: t5 = t0.Item2; [8]
[8]: t5 == 2 ? [12] : [11]
[9]: t4 == 3 ? [10] : [13]
[10]: t5 = t0.Item2; [11]
[11]: t5 == 1 ? [12] : [13]
[12]: leaf <isPatternSuccess> `(System.IComparable and int and 1, 2) or (int and (1 or 3), 1)`
[13]: leaf <isPatternFailure> `u is (System.IComparable and int and 1, 2) or (int and (1 or 3), 1)`
",
forLowering: true);
CompilationVerifier verifier = CompileAndVerify(
comp,
expectedOutput: @"
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
True
TryGetValue(IComparable)
True
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
True
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
TryGetValue(IComparable)
False
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 84 (0x54)
.maxstack 2
.locals init (S1 V_0,
System.IComparable V_1,
System.IComparable V_2,
int V_3,
int V_4,
bool V_5)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out System.IComparable)""
IL_0010: brfalse.s IL_004e
IL_0012: ldloc.1
IL_0013: stloc.2
IL_0014: ldloc.2
IL_0015: isinst ""int""
IL_001a: brfalse.s IL_004e
IL_001c: ldloc.2
IL_001d: unbox.any ""int""
IL_0022: stloc.3
IL_0023: ldloc.3
IL_0024: ldc.i4.1
IL_0025: beq.s IL_002d
IL_0027: ldloc.3
IL_0028: ldc.i4.3
IL_0029: beq.s IL_003c
IL_002b: br.s IL_004e
IL_002d: ldarg.0
IL_002e: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0033: stloc.s V_4
IL_0035: ldloc.s V_4
IL_0037: ldc.i4.2
IL_0038: beq.s IL_0049
IL_003a: br.s IL_0044
IL_003c: ldarg.0
IL_003d: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0042: stloc.s V_4
IL_0044: ldloc.s V_4
IL_0046: ldc.i4.1
IL_0047: bne.un.s IL_004e
IL_0049: ldc.i4.1
IL_004a: stloc.s V_5
IL_004c: br.s IL_0051
IL_004e: ldc.i4.0
IL_004f: stloc.s V_5
IL_0051: ldloc.s V_5
IL_0053: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_53_TryGetValue()
{
var src = @"
using System;
class C11;
class C12;
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C11 x) { _value = x; }
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(IComparable x) { _value = x; }
public S1(C12 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue(int) "");
if (_value is int)
{
x = (int)_value;
return true;
}
x = 0;
return false;
}
public bool TryGetValue(out IComparable x)
{
System.Console.Write(""TryGetValue(IComparable) "");
x = _value as IComparable;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1(1), new S1(""1""), new S1(2), new S1(""2""), new S1(3), new S1(""3"")];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (int and 1, 2) or (System.IComparable and { AsInt: 3 }, 1);
}
}
static class IComparableExtensions
{
extension(IComparable c)
{
public int? AsInt
{
get
{
c.GetHashCode(); // We do not expect null inputs
var result = c as int?;
if (result.HasValue && result.Value == 0)
{
throw new Exception(""Unexpected 0 value"");
}
return result;
}
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Item1; [1]
[1]: TryGetValue(int): (Item1, ReturnItem) t2 = t1; [2]
[2]: t2.ReturnItem == True ? [3] : [15]
[3]: t3 = (int)t2.Item1; [4]
[4]: t3 == 1 ? [5] : [13]
[5]: t4 = t0.Item2; [6]
[6]: t4 == 2 ? [24] : [7]
[7]: t5 = (System.IComparable)t2.Item1; [8]
[8]: PassThrough t5; [9]
[9]: t7 = t5.AsInt; [10]
[10]: t7 != null ? [11] : [25]
[11]: t8 = (int)t7; [12]
[12]: t8 == 3 ? [23] : [25]
[13]: t5 = (System.IComparable)t2.Item1; [14]
[14]: PassThrough t5; [18]
[15]: TryGetValue(System.IComparable): (Item1, ReturnItem) t9 = t1; [16]
[16]: t9.ReturnItem == True ? [17] : [25]
[17]: t5 = (System.IComparable)t9.Item1; [18]
[18]: t7 = t5.AsInt; [19]
[19]: t7 != null ? [20] : [25]
[20]: t8 = (int)t7; [21]
[21]: t8 == 3 ? [22] : [25]
[22]: t4 = t0.Item2; [23]
[23]: t4 == 1 ? [24] : [25]
[24]: leaf <isPatternSuccess> `(int and 1, 2) or (System.IComparable and { AsInt: 3 }, 1)`
[25]: leaf <isPatternFailure> `u is (int and 1, 2) or (System.IComparable and { AsInt: 3 }, 1)`
",
forLowering: true);
var verifier = CompileAndVerify(
comp,
expectedOutput: @"
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int)
False
TryGetValue(int)
True
TryGetValue(int)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int)
False
TryGetValue(int)
False
TryGetValue(int)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int)
True
TryGetValue(int)
False
TryGetValue(int)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(IComparable)
False
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 141 (0x8d)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
System.IComparable V_3,
int? V_4,
System.IComparable V_5,
bool V_6)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out int)""
IL_0010: brfalse.s IL_004e
IL_0012: ldloc.1
IL_0013: ldc.i4.1
IL_0014: bne.un.s IL_0045
IL_0016: ldarg.0
IL_0017: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_001c: stloc.2
IL_001d: ldloc.2
IL_001e: ldc.i4.2
IL_001f: beq.s IL_0082
IL_0021: ldloc.1
IL_0022: box ""int""
IL_0027: stloc.3
IL_0028: ldloc.3
IL_0029: call ""int? IComparableExtensions.get_AsInt(System.IComparable)""
IL_002e: stloc.s V_4
IL_0030: ldloca.s V_4
IL_0032: call ""bool int?.HasValue.get""
IL_0037: brfalse.s IL_0087
IL_0039: ldloca.s V_4
IL_003b: call ""int int?.GetValueOrDefault()""
IL_0040: ldc.i4.3
IL_0041: beq.s IL_007e
IL_0043: br.s IL_0087
IL_0045: ldloc.1
IL_0046: box ""int""
IL_004b: stloc.3
IL_004c: br.s IL_005c
IL_004e: ldloca.s V_0
IL_0050: ldloca.s V_5
IL_0052: call ""bool S1.TryGetValue(out System.IComparable)""
IL_0057: brfalse.s IL_0087
IL_0059: ldloc.s V_5
IL_005b: stloc.3
IL_005c: ldloc.3
IL_005d: call ""int? IComparableExtensions.get_AsInt(System.IComparable)""
IL_0062: stloc.s V_4
IL_0064: ldloca.s V_4
IL_0066: call ""bool int?.HasValue.get""
IL_006b: brfalse.s IL_0087
IL_006d: ldloca.s V_4
IL_006f: call ""int int?.GetValueOrDefault()""
IL_0074: ldc.i4.3
IL_0075: bne.un.s IL_0087
IL_0077: ldarg.0
IL_0078: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_007d: stloc.2
IL_007e: ldloc.2
IL_007f: ldc.i4.1
IL_0080: bne.un.s IL_0087
IL_0082: ldc.i4.1
IL_0083: stloc.s V_6
IL_0085: br.s IL_008a
IL_0087: ldc.i4.0
IL_0088: stloc.s V_6
IL_008a: ldloc.s V_6
IL_008c: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_54_TryGetValue()
{
var src = @"
using System;
class C11;
class C12 : IConvertible
{
public TypeCode GetTypeCode() => throw null;
public bool ToBoolean(IFormatProvider provider) => throw null;
public byte ToByte(IFormatProvider provider) => throw null;
public char ToChar(IFormatProvider provider) => throw null;
public DateTime ToDateTime(IFormatProvider provider) => throw null;
public decimal ToDecimal(IFormatProvider provider) => throw null;
public double ToDouble(IFormatProvider provider) => throw null;
public short ToInt16(IFormatProvider provider) => throw null;
public int ToInt32(IFormatProvider provider) => throw null;
public long ToInt64(IFormatProvider provider) => throw null;
public sbyte ToSByte(IFormatProvider provider) => throw null;
public float ToSingle(IFormatProvider provider) => throw null;
public string ToString(IFormatProvider provider) => throw null;
public object ToType(Type conversionType, IFormatProvider provider) => throw null;
public ushort ToUInt16(IFormatProvider provider) => throw null;
public uint ToUInt32(IFormatProvider provider) => throw null;
public ulong ToUInt64(IFormatProvider provider) => throw null;
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C11 x) { _value = x; }
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(IComparable x) { _value = x; }
public S1(IConvertible x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue(int) "");
if (_value is int)
{
x = (int)_value;
return true;
}
x = 0;
return false;
}
public bool TryGetValue(out IComparable x)
{
System.Console.Write(""TryGetValue(IComparable) "");
x = _value as IComparable;
return x != null;
}
public bool TryGetValue(out IConvertible x)
{
System.Console.Write(""TryGetValue(IConvertible) "");
x = _value as IConvertible;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1(1), new S1(""1""), new S1(2), new S1(""2""), new S1(3), new S1(""3"")];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (IConvertible and int and 1, 2) or (System.IComparable and { AsInt: 3 }, 1);
}
}
static class IComparableExtensions
{
extension(IComparable c)
{
public int? AsInt
{
get
{
c.GetHashCode(); // We do not expect null inputs
var result = c as int?;
if (result.HasValue && result.Value == 0)
{
throw new Exception(""Unexpected 0 value"");
}
return result;
}
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Item1; [1]
[1]: TryGetValue(System.IConvertible): (Item1, ReturnItem) t2 = t1; [2]
[2]: t2.ReturnItem == True ? [3] : [17]
[3]: t3 = (System.IConvertible)t2.Item1; [4]
[4]: t3 is int ? [5] : [17]
[5]: t4 = (int)t3; [6]
[6]: t4 == 1 ? [7] : [15]
[7]: t5 = t0.Item2; [8]
[8]: t5 == 2 ? [26] : [9]
[9]: t6 = (System.IComparable)t3; [10]
[10]: PassThrough t6; [11]
[11]: t8 = t6.AsInt; [12]
[12]: t8 != null ? [13] : [27]
[13]: t9 = (int)t8; [14]
[14]: t9 == 3 ? [25] : [27]
[15]: t6 = (System.IComparable)t3; [16]
[16]: PassThrough t6; [20]
[17]: TryGetValue(System.IComparable): (Item1, ReturnItem) t10 = t1; [18]
[18]: t10.ReturnItem == True ? [19] : [27]
[19]: t6 = (System.IComparable)t10.Item1; [20]
[20]: t8 = t6.AsInt; [21]
[21]: t8 != null ? [22] : [27]
[22]: t9 = (int)t8; [23]
[23]: t9 == 3 ? [24] : [27]
[24]: t5 = t0.Item2; [25]
[25]: t5 == 1 ? [26] : [27]
[26]: leaf <isPatternSuccess> `(IConvertible and int and 1, 2) or (System.IComparable and { AsInt: 3 }, 1)`
[27]: leaf <isPatternFailure> `u is (IConvertible and int and 1, 2) or (System.IComparable and { AsInt: 3 }, 1)`
",
forLowering: true);
var verifier = CompileAndVerify(
comp,
expectedOutput: @"
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible)
False
TryGetValue(IConvertible)
True
TryGetValue(IConvertible)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible)
False
TryGetValue(IConvertible)
False
TryGetValue(IConvertible)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible)
True
TryGetValue(IConvertible)
False
TryGetValue(IConvertible)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 161 (0xa1)
.maxstack 2
.locals init (S1 V_0,
System.IConvertible V_1,
System.IConvertible V_2,
int V_3,
System.IComparable V_4,
int? V_5,
System.IComparable V_6,
bool V_7)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out System.IConvertible)""
IL_0010: brfalse.s IL_0060
IL_0012: ldloc.1
IL_0013: stloc.2
IL_0014: ldloc.2
IL_0015: isinst ""int""
IL_001a: brfalse.s IL_0060
IL_001c: ldloc.2
IL_001d: unbox.any ""int""
IL_0022: ldc.i4.1
IL_0023: bne.un.s IL_0056
IL_0025: ldarg.0
IL_0026: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002b: stloc.3
IL_002c: ldloc.3
IL_002d: ldc.i4.2
IL_002e: beq.s IL_0096
IL_0030: ldloc.2
IL_0031: castclass ""System.IComparable""
IL_0036: stloc.s V_4
IL_0038: ldloc.s V_4
IL_003a: call ""int? IComparableExtensions.get_AsInt(System.IComparable)""
IL_003f: stloc.s V_5
IL_0041: ldloca.s V_5
IL_0043: call ""bool int?.HasValue.get""
IL_0048: brfalse.s IL_009b
IL_004a: ldloca.s V_5
IL_004c: call ""int int?.GetValueOrDefault()""
IL_0051: ldc.i4.3
IL_0052: beq.s IL_0092
IL_0054: br.s IL_009b
IL_0056: ldloc.2
IL_0057: castclass ""System.IComparable""
IL_005c: stloc.s V_4
IL_005e: br.s IL_006f
IL_0060: ldloca.s V_0
IL_0062: ldloca.s V_6
IL_0064: call ""bool S1.TryGetValue(out System.IComparable)""
IL_0069: brfalse.s IL_009b
IL_006b: ldloc.s V_6
IL_006d: stloc.s V_4
IL_006f: ldloc.s V_4
IL_0071: call ""int? IComparableExtensions.get_AsInt(System.IComparable)""
IL_0076: stloc.s V_5
IL_0078: ldloca.s V_5
IL_007a: call ""bool int?.HasValue.get""
IL_007f: brfalse.s IL_009b
IL_0081: ldloca.s V_5
IL_0083: call ""int int?.GetValueOrDefault()""
IL_0088: ldc.i4.3
IL_0089: bne.un.s IL_009b
IL_008b: ldarg.0
IL_008c: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0091: stloc.3
IL_0092: ldloc.3
IL_0093: ldc.i4.1
IL_0094: bne.un.s IL_009b
IL_0096: ldc.i4.1
IL_0097: stloc.s V_7
IL_0099: br.s IL_009e
IL_009b: ldc.i4.0
IL_009c: stloc.s V_7
IL_009e: ldloc.s V_7
IL_00a0: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_55_TryGetValue()
{
var src = @"
using System;
class C11;
class C12 : IConvertible
{
public TypeCode GetTypeCode() => throw null;
public bool ToBoolean(IFormatProvider provider) => throw null;
public byte ToByte(IFormatProvider provider) => throw null;
public char ToChar(IFormatProvider provider) => throw null;
public DateTime ToDateTime(IFormatProvider provider) => throw null;
public decimal ToDecimal(IFormatProvider provider) => throw null;
public double ToDouble(IFormatProvider provider) => throw null;
public short ToInt16(IFormatProvider provider) => throw null;
public int ToInt32(IFormatProvider provider) => throw null;
public long ToInt64(IFormatProvider provider) => throw null;
public sbyte ToSByte(IFormatProvider provider) => throw null;
public float ToSingle(IFormatProvider provider) => throw null;
public string ToString(IFormatProvider provider) => throw null;
public object ToType(Type conversionType, IFormatProvider provider) => throw null;
public ushort ToUInt16(IFormatProvider provider) => throw null;
public uint ToUInt32(IFormatProvider provider) => throw null;
public ulong ToUInt64(IFormatProvider provider) => throw null;
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C11 x) { _value = x; }
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(IComparable x) { _value = x; }
public S1(IConvertible x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue(int) "");
if (_value is int)
{
x = (int)_value;
return true;
}
x = 0;
return false;
}
public bool TryGetValue(out IComparable x)
{
System.Console.Write(""TryGetValue(IComparable) "");
x = _value as IComparable;
return x != null;
}
public bool TryGetValue(out IConvertible x)
{
System.Console.Write(""TryGetValue(IConvertible) "");
x = _value as IConvertible;
return x != null;
}
public bool TryGetValue(out string x)
{
System.Console.Write(""TryGetValue(string) "");
x = _value as string;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1(1), new S1(""1""), new S1(2), new S1(""2""), new S1(3), new S1(""3"")];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (int and 1, 2) or (string and ""3"", 3) or (System.IComparable and { AsInt: 3 }, 1);
}
}
static class IComparableExtensions
{
extension(IComparable c)
{
public int? AsInt
{
get
{
c.GetHashCode(); // We do not expect null inputs
var result = c as int?;
if (result.HasValue && result.Value == 0)
{
throw new Exception(""Unexpected 0 value"");
}
return result;
}
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Item1; [1]
[1]: TryGetValue(int): (Item1, ReturnItem) t2 = t1; [2]
[2]: t2.ReturnItem == True ? [3] : [11]
[3]: t3 = (int)t2.Item1; [4]
[4]: t3 == 1 ? [5] : [9]
[5]: t4 = t0.Item2; [6]
[6]: t4 == 2 ? [34] : [7]
[7]: t5 = (System.IComparable)t2.Item1; [8]
[8]: PassThrough t5; [19]
[9]: t5 = (System.IComparable)t2.Item1; [10]
[10]: PassThrough t5; [28]
[11]: TryGetValue(string): (Item1, ReturnItem) t7 = t1; [12]
[12]: t7.ReturnItem == True ? [13] : [25]
[13]: t8 = (string)t7.Item1; [14]
[14]: t8 == ""3"" ? [15] : [23]
[15]: t4 = t0.Item2; [16]
[16]: t4 == 3 ? [34] : [17]
[17]: t5 = (System.IComparable)t7.Item1; [18]
[18]: PassThrough t5; [19]
[19]: t10 = t5.AsInt; [20]
[20]: t10 != null ? [21] : [35]
[21]: t11 = (int)t10; [22]
[22]: t11 == 3 ? [33] : [35]
[23]: t5 = (System.IComparable)t7.Item1; [24]
[24]: PassThrough t5; [28]
[25]: TryGetValue(System.IComparable): (Item1, ReturnItem) t12 = t1; [26]
[26]: t12.ReturnItem == True ? [27] : [35]
[27]: t5 = (System.IComparable)t12.Item1; [28]
[28]: t10 = t5.AsInt; [29]
[29]: t10 != null ? [30] : [35]
[30]: t11 = (int)t10; [31]
[31]: t11 == 3 ? [32] : [35]
[32]: t4 = t0.Item2; [33]
[33]: t4 == 1 ? [34] : [35]
[34]: leaf <isPatternSuccess> `(int and 1, 2) or (string and ""3"", 3) or (System.IComparable and { AsInt: 3 }, 1)`
[35]: leaf <isPatternFailure> `u is (int and 1, 2) or (string and ""3"", 3) or (System.IComparable and { AsInt: 3 }, 1)`
",
forLowering: true);
var verifier = CompileAndVerify(
comp,
expectedOutput: @"
TryGetValue(int) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(int) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(int)
False
TryGetValue(int)
True
TryGetValue(int)
False
TryGetValue(int) TryGetValue(string)
False
TryGetValue(int) TryGetValue(string)
False
TryGetValue(int) TryGetValue(string)
False
TryGetValue(int)
False
TryGetValue(int)
False
TryGetValue(int)
False
TryGetValue(int) TryGetValue(string)
False
TryGetValue(int) TryGetValue(string)
False
TryGetValue(int) TryGetValue(string)
False
TryGetValue(int)
True
TryGetValue(int)
False
TryGetValue(int)
False
TryGetValue(int) TryGetValue(string)
False
TryGetValue(int) TryGetValue(string)
False
TryGetValue(int) TryGetValue(string)
True
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 190 (0xbe)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
System.IComparable V_3,
string V_4,
int? V_5,
System.IComparable V_6,
bool V_7)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out int)""
IL_0010: brfalse.s IL_0036
IL_0012: ldloc.1
IL_0013: ldc.i4.1
IL_0014: bne.un.s IL_002d
IL_0016: ldarg.0
IL_0017: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_001c: stloc.2
IL_001d: ldloc.2
IL_001e: ldc.i4.2
IL_001f: beq IL_00b3
IL_0024: ldloc.1
IL_0025: box ""int""
IL_002a: stloc.3
IL_002b: br.s IL_005d
IL_002d: ldloc.1
IL_002e: box ""int""
IL_0033: stloc.3
IL_0034: br.s IL_008d
IL_0036: ldloca.s V_0
IL_0038: ldloca.s V_4
IL_003a: call ""bool S1.TryGetValue(out string)""
IL_003f: brfalse.s IL_007f
IL_0041: ldloc.s V_4
IL_0043: ldstr ""3""
IL_0048: call ""bool string.op_Equality(string, string)""
IL_004d: brfalse.s IL_007a
IL_004f: ldarg.0
IL_0050: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0055: stloc.2
IL_0056: ldloc.2
IL_0057: ldc.i4.3
IL_0058: beq.s IL_00b3
IL_005a: ldloc.s V_4
IL_005c: stloc.3
IL_005d: ldloc.3
IL_005e: call ""int? IComparableExtensions.get_AsInt(System.IComparable)""
IL_0063: stloc.s V_5
IL_0065: ldloca.s V_5
IL_0067: call ""bool int?.HasValue.get""
IL_006c: brfalse.s IL_00b8
IL_006e: ldloca.s V_5
IL_0070: call ""int int?.GetValueOrDefault()""
IL_0075: ldc.i4.3
IL_0076: beq.s IL_00af
IL_0078: br.s IL_00b8
IL_007a: ldloc.s V_4
IL_007c: stloc.3
IL_007d: br.s IL_008d
IL_007f: ldloca.s V_0
IL_0081: ldloca.s V_6
IL_0083: call ""bool S1.TryGetValue(out System.IComparable)""
IL_0088: brfalse.s IL_00b8
IL_008a: ldloc.s V_6
IL_008c: stloc.3
IL_008d: ldloc.3
IL_008e: call ""int? IComparableExtensions.get_AsInt(System.IComparable)""
IL_0093: stloc.s V_5
IL_0095: ldloca.s V_5
IL_0097: call ""bool int?.HasValue.get""
IL_009c: brfalse.s IL_00b8
IL_009e: ldloca.s V_5
IL_00a0: call ""int int?.GetValueOrDefault()""
IL_00a5: ldc.i4.3
IL_00a6: bne.un.s IL_00b8
IL_00a8: ldarg.0
IL_00a9: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_00ae: stloc.2
IL_00af: ldloc.2
IL_00b0: ldc.i4.1
IL_00b1: bne.un.s IL_00b8
IL_00b3: ldc.i4.1
IL_00b4: stloc.s V_7
IL_00b6: br.s IL_00bb
IL_00b8: ldc.i4.0
IL_00b9: stloc.s V_7
IL_00bb: ldloc.s V_7
IL_00bd: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_56_TryGetValue()
{
var src = @"
using System;
class C11;
class C12 : IConvertible
{
public TypeCode GetTypeCode() => throw null;
public bool ToBoolean(IFormatProvider provider) => throw null;
public byte ToByte(IFormatProvider provider) => throw null;
public char ToChar(IFormatProvider provider) => throw null;
public DateTime ToDateTime(IFormatProvider provider) => throw null;
public decimal ToDecimal(IFormatProvider provider) => throw null;
public double ToDouble(IFormatProvider provider) => throw null;
public short ToInt16(IFormatProvider provider) => throw null;
public int ToInt32(IFormatProvider provider) => throw null;
public long ToInt64(IFormatProvider provider) => throw null;
public sbyte ToSByte(IFormatProvider provider) => throw null;
public float ToSingle(IFormatProvider provider) => throw null;
public string ToString(IFormatProvider provider) => throw null;
public object ToType(Type conversionType, IFormatProvider provider) => throw null;
public ushort ToUInt16(IFormatProvider provider) => throw null;
public uint ToUInt32(IFormatProvider provider) => throw null;
public ulong ToUInt64(IFormatProvider provider) => throw null;
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C11 x) { _value = x; }
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public S1(IComparable x) { _value = x; }
public S1(IConvertible x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool HasValue
{
get
{
System.Console.Write(""HasValue "");
return _value != null;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue(int) "");
if (_value is int)
{
x = (int)_value;
return true;
}
x = 0;
return false;
}
public bool TryGetValue(out IComparable x)
{
System.Console.Write(""TryGetValue(IComparable) "");
x = _value as IComparable;
return x != null;
}
public bool TryGetValue(out IConvertible x)
{
System.Console.Write(""TryGetValue(IConvertible) "");
x = _value as IConvertible;
return x != null;
}
public bool TryGetValue(out string x)
{
System.Console.Write(""TryGetValue(string) "");
x = _value as string;
return x != null;
}
static void Main()
{
S1[] s = [new S1(), new S1(new C11()), new S1(new C12()), new S1(1), new S1(""1""), new S1(2), new S1(""2""), new S1(3), new S1(""3"")];
int[] i = [1, 2, 3];
foreach (var s1 in s)
{
foreach (var j in i)
{
var t = Test1((s1, j));
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
}
static bool Test1((S1, int) u)
{
return u is (IConvertible and int and 1, 2) or (string and ""3"", 3) or (System.IComparable and { AsInt: 3 }, 1);
}
}
static class IComparableExtensions
{
extension(IComparable c)
{
public int? AsInt
{
get
{
c.GetHashCode(); // We do not expect null inputs
var result = c as int?;
if (result.HasValue && result.Value == 0)
{
throw new Exception(""Unexpected 0 value"");
}
return result;
}
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Item1; [1]
[1]: TryGetValue(System.IConvertible): (Item1, ReturnItem) t2 = t1; [2]
[2]: t2.ReturnItem == True ? [3] : [27]
[3]: t3 = (System.IConvertible)t2.Item1; [4]
[4]: t3 is int ? [5] : [13]
[5]: t4 = (int)t3; [6]
[6]: t4 == 1 ? [7] : [11]
[7]: t5 = t0.Item2; [8]
[8]: t5 == 2 ? [36] : [9]
[9]: t6 = (System.IComparable)t3; [10]
[10]: PassThrough t6; [21]
[11]: t6 = (System.IComparable)t3; [12]
[12]: PassThrough t6; [30]
[13]: TryGetValue(string): (Item1, ReturnItem) t8 = t1; [14]
[14]: t8.ReturnItem == True ? [15] : [27]
[15]: t9 = (string)t8.Item1; [16]
[16]: t9 == ""3"" ? [17] : [25]
[17]: t5 = t0.Item2; [18]
[18]: t5 == 3 ? [36] : [19]
[19]: t6 = (System.IComparable)t8.Item1; [20]
[20]: PassThrough t6; [21]
[21]: t11 = t6.AsInt; [22]
[22]: t11 != null ? [23] : [37]
[23]: t12 = (int)t11; [24]
[24]: t12 == 3 ? [35] : [37]
[25]: t6 = (System.IComparable)t8.Item1; [26]
[26]: PassThrough t6; [30]
[27]: TryGetValue(System.IComparable): (Item1, ReturnItem) t13 = t1; [28]
[28]: t13.ReturnItem == True ? [29] : [37]
[29]: t6 = (System.IComparable)t13.Item1; [30]
[30]: t11 = t6.AsInt; [31]
[31]: t11 != null ? [32] : [37]
[32]: t12 = (int)t11; [33]
[33]: t12 == 3 ? [34] : [37]
[34]: t5 = t0.Item2; [35]
[35]: t5 == 1 ? [36] : [37]
[36]: leaf <isPatternSuccess> `(IConvertible and int and 1, 2) or (string and ""3"", 3) or (System.IComparable and { AsInt: 3 }, 1)`
[37]: leaf <isPatternFailure> `u is (IConvertible and int and 1, 2) or (string and ""3"", 3) or (System.IComparable and { AsInt: 3 }, 1)`
",
forLowering: true);
var verifier = CompileAndVerify(
comp,
expectedOutput: @"
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(IConvertible) TryGetValue(string) TryGetValue(IComparable)
False
TryGetValue(IConvertible)
False
TryGetValue(IConvertible)
True
TryGetValue(IConvertible)
False
TryGetValue(IConvertible) TryGetValue(string)
False
TryGetValue(IConvertible) TryGetValue(string)
False
TryGetValue(IConvertible) TryGetValue(string)
False
TryGetValue(IConvertible)
False
TryGetValue(IConvertible)
False
TryGetValue(IConvertible)
False
TryGetValue(IConvertible) TryGetValue(string)
False
TryGetValue(IConvertible) TryGetValue(string)
False
TryGetValue(IConvertible) TryGetValue(string)
False
TryGetValue(IConvertible)
True
TryGetValue(IConvertible)
False
TryGetValue(IConvertible)
False
TryGetValue(IConvertible) TryGetValue(string)
False
TryGetValue(IConvertible) TryGetValue(string)
False
TryGetValue(IConvertible) TryGetValue(string)
True
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 215 (0xd7)
.maxstack 2
.locals init (S1 V_0,
System.IConvertible V_1,
System.IConvertible V_2,
int V_3,
System.IComparable V_4,
string V_5,
int? V_6,
System.IComparable V_7,
bool V_8)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out System.IConvertible)""
IL_0010: brfalse IL_0096
IL_0015: ldloc.1
IL_0016: stloc.2
IL_0017: ldloc.2
IL_0018: isinst ""int""
IL_001d: brfalse.s IL_004a
IL_001f: ldloc.2
IL_0020: unbox.any ""int""
IL_0025: ldc.i4.1
IL_0026: bne.un.s IL_0040
IL_0028: ldarg.0
IL_0029: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_002e: stloc.3
IL_002f: ldloc.3
IL_0030: ldc.i4.2
IL_0031: beq IL_00cc
IL_0036: ldloc.2
IL_0037: castclass ""System.IComparable""
IL_003c: stloc.s V_4
IL_003e: br.s IL_0072
IL_0040: ldloc.2
IL_0041: castclass ""System.IComparable""
IL_0046: stloc.s V_4
IL_0048: br.s IL_00a5
IL_004a: ldloca.s V_0
IL_004c: ldloca.s V_5
IL_004e: call ""bool S1.TryGetValue(out string)""
IL_0053: brfalse.s IL_0096
IL_0055: ldloc.s V_5
IL_0057: ldstr ""3""
IL_005c: call ""bool string.op_Equality(string, string)""
IL_0061: brfalse.s IL_0090
IL_0063: ldarg.0
IL_0064: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_0069: stloc.3
IL_006a: ldloc.3
IL_006b: ldc.i4.3
IL_006c: beq.s IL_00cc
IL_006e: ldloc.s V_5
IL_0070: stloc.s V_4
IL_0072: ldloc.s V_4
IL_0074: call ""int? IComparableExtensions.get_AsInt(System.IComparable)""
IL_0079: stloc.s V_6
IL_007b: ldloca.s V_6
IL_007d: call ""bool int?.HasValue.get""
IL_0082: brfalse.s IL_00d1
IL_0084: ldloca.s V_6
IL_0086: call ""int int?.GetValueOrDefault()""
IL_008b: ldc.i4.3
IL_008c: beq.s IL_00c8
IL_008e: br.s IL_00d1
IL_0090: ldloc.s V_5
IL_0092: stloc.s V_4
IL_0094: br.s IL_00a5
IL_0096: ldloca.s V_0
IL_0098: ldloca.s V_7
IL_009a: call ""bool S1.TryGetValue(out System.IComparable)""
IL_009f: brfalse.s IL_00d1
IL_00a1: ldloc.s V_7
IL_00a3: stloc.s V_4
IL_00a5: ldloc.s V_4
IL_00a7: call ""int? IComparableExtensions.get_AsInt(System.IComparable)""
IL_00ac: stloc.s V_6
IL_00ae: ldloca.s V_6
IL_00b0: call ""bool int?.HasValue.get""
IL_00b5: brfalse.s IL_00d1
IL_00b7: ldloca.s V_6
IL_00b9: call ""int int?.GetValueOrDefault()""
IL_00be: ldc.i4.3
IL_00bf: bne.un.s IL_00d1
IL_00c1: ldarg.0
IL_00c2: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_00c7: stloc.3
IL_00c8: ldloc.3
IL_00c9: ldc.i4.1
IL_00ca: bne.un.s IL_00d1
IL_00cc: ldc.i4.1
IL_00cd: stloc.s V_8
IL_00cf: br.s IL_00d4
IL_00d1: ldc.i4.0
IL_00d2: stloc.s V_8
IL_00d4: ldloc.s V_8
IL_00d6: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_57_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue "");
if (_value is int v)
{
x = v;
return true;
}
x = 0;
return false;
}
static void Main()
{
System.Console.Write(Test1((new S1(1), 1)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(1), 2)));
System.Console.Write(""; "");
System.Console.Write(Test1((new S1(""a""), 1)));
}
static bool Test1((S1, int) u)
{
return u is (1, 1) or (1, 2);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TryGetValue True; TryGetValue False; TryGetValue True; TryGetValue False").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 43 (0x2b)
.maxstack 2
.locals init (S1 V_0,
int V_1,
int V_2,
bool V_3)
IL_0000: ldarg.0
IL_0001: ldfld ""S1 System.ValueTuple<S1, int>.Item1""
IL_0006: stloc.0
IL_0007: ldloca.s V_0
IL_0009: ldloca.s V_1
IL_000b: call ""bool S1.TryGetValue(out int)""
IL_0010: brfalse.s IL_0027
IL_0012: ldloc.1
IL_0013: ldc.i4.1
IL_0014: bne.un.s IL_0027
IL_0016: ldarg.0
IL_0017: ldfld ""int System.ValueTuple<S1, int>.Item2""
IL_001c: stloc.2
IL_001d: ldloc.2
IL_001e: ldc.i4.1
IL_001f: sub
IL_0020: ldc.i4.1
IL_0021: bgt.un.s IL_0027
IL_0023: ldc.i4.1
IL_0024: stloc.3
IL_0025: br.s IL_0029
IL_0027: ldc.i4.0
IL_0028: stloc.3
IL_0029: ldloc.3
IL_002a: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_58_TryGetValue()
{
var src = @"
class C1(int f1, int f2)
{
public int F11 = f1;
public int F12 = f2;
}
class C2(int f11, int f12, int f2) : C1(f11, f12)
{
public int F2 = f2;
}
class C3(int f1, int f2) : C1(f1, f2)
{
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
static void Main()
{
S1[] s = [new S1(),
new S1(new C3(1, 1)), new S1(new C3(1, 3)), new S1(new C3(2, 3)), new S1(new C3(2, 4)),
new S1(new C2(1, 1, 1)), new S1(new C2(1, 3, 1)), new S1(new C2(2, 3, 1)), new S1(new C2(2, 4, 1)),
new S1(new C2(1, 1, 2)), new S1(new C2(1, 3, 2)), new S1(new C2(2, 3, 2)), new S1(new C2(2, 4, 2))];
foreach (var s1 in s)
{
var t = Test1(s1);
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
static bool Test1(S1 u)
{
return u is not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 });
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Value; [1]
[1]: t1 is C1 ? [2] : [12]
[2]: t2 = (C1)t1; [3]
[3]: t3 = t2.F11; [4]
[4]: t3 == 1 ? [9] : [5]
[5]: t1 is C2 ? [6] : [12]
[6]: t4 = (C2)t1; [7]
[7]: t5 = t4.F2; [8]
[8]: t5 == 2 ? [9] : [12]
[9]: t6 = t2.F12; [10]
[10]: t6 == 3 ? [11] : [12]
[11]: leaf <isPatternFailure> `u is not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 })`
[12]: leaf <isPatternSuccess> `not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 })`
",
forLowering: true);
var verifier = CompileAndVerify(comp, expectedOutput: @"
get_Value
True
get_Value
True
get_Value
False
get_Value
True
get_Value
True
get_Value
True
get_Value
False
get_Value
True
get_Value
True
get_Value
True
get_Value
False
get_Value
False
get_Value
True
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 63 (0x3f)
.maxstack 2
.locals init (object V_0,
C1 V_1,
C2 V_2,
bool V_3)
IL_0000: ldarga.s V_0
IL_0002: call ""object S1.Value.get""
IL_0007: stloc.0
IL_0008: ldloc.0
IL_0009: isinst ""C1""
IL_000e: stloc.1
IL_000f: ldloc.1
IL_0010: brfalse.s IL_0037
IL_0012: ldloc.1
IL_0013: ldfld ""int C1.F11""
IL_0018: ldc.i4.1
IL_0019: beq.s IL_002e
IL_001b: ldloc.0
IL_001c: isinst ""C2""
IL_0021: stloc.2
IL_0022: ldloc.2
IL_0023: brfalse.s IL_0037
IL_0025: ldloc.2
IL_0026: ldfld ""int C2.F2""
IL_002b: ldc.i4.2
IL_002c: bne.un.s IL_0037
IL_002e: ldloc.1
IL_002f: ldfld ""int C1.F12""
IL_0034: ldc.i4.3
IL_0035: beq.s IL_003b
IL_0037: ldc.i4.1
IL_0038: stloc.3
IL_0039: br.s IL_003d
IL_003b: ldc.i4.0
IL_003c: stloc.3
IL_003d: ldloc.3
IL_003e: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_59_TryGetValue()
{
var src = @"
class C1(int f1, int f2)
{
public int F11 = f1;
public int F12 = f2;
}
class C2(int f11, int f12, int f2) : C1(f11, f12)
{
public int F2 = f2;
}
class C3(int f1, int f2) : C1(f1, f2)
{
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out C1 x)
{
System.Console.Write(""TryGetValue(C1) "");
x = _value as C1;
return x != null;
}
public bool TryGetValue(out C2 x)
{
System.Console.Write(""TryGetValue(C2) "");
x = _value as C2;
return x != null;
}
public bool TryGetValue(out C3 x)
{
System.Console.Write(""TryGetValue(C3) "");
x = _value as C3;
return x != null;
}
static void Main()
{
S1[] s = [new S1(),
new S1(new C3(1, 1)), new S1(new C3(1, 3)), new S1(new C3(2, 3)), new S1(new C3(2, 4)),
new S1(new C2(1, 1, 1)), new S1(new C2(1, 3, 1)), new S1(new C2(2, 3, 1)), new S1(new C2(2, 4, 1)),
new S1(new C2(1, 1, 2)), new S1(new C2(1, 3, 2)), new S1(new C2(2, 3, 2)), new S1(new C2(2, 4, 2))];
foreach (var s1 in s)
{
var t = Test1(s1);
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
static bool Test1(S1 u)
{
return u is not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 });
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: TryGetValue(C1): (Item1, ReturnItem) t1 = t0; [1]
[1]: t1.ReturnItem == True ? [2] : [13]
[2]: t2 = (C1)t1.Item1; [3]
[3]: t3 = t2.F11; [4]
[4]: t3 == 1 ? [10] : [5]
[5]: TryGetValue(C2): (Item1, ReturnItem) t4 = t0; [6]
[6]: t4.ReturnItem == True ? [7] : [13]
[7]: t5 = (C2)t4.Item1; [8]
[8]: t6 = t5.F2; [9]
[9]: t6 == 2 ? [10] : [13]
[10]: t7 = t2.F12; [11]
[11]: t7 == 3 ? [12] : [13]
[12]: leaf <isPatternFailure> `u is not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 })`
[13]: leaf <isPatternSuccess> `not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 })`
",
forLowering: true);
var verifier = CompileAndVerify(comp, expectedOutput: @"
TryGetValue(C1)
True
TryGetValue(C1)
True
TryGetValue(C1)
False
TryGetValue(C1) TryGetValue(C2)
True
TryGetValue(C1) TryGetValue(C2)
True
TryGetValue(C1)
True
TryGetValue(C1)
False
TryGetValue(C1) TryGetValue(C2)
True
TryGetValue(C1) TryGetValue(C2)
True
TryGetValue(C1)
True
TryGetValue(C1)
False
TryGetValue(C1) TryGetValue(C2)
False
TryGetValue(C1) TryGetValue(C2)
True
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 59 (0x3b)
.maxstack 2
.locals init (C1 V_0,
C1 V_1,
C2 V_2,
bool V_3)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out C1)""
IL_0009: brfalse.s IL_0033
IL_000b: ldloc.0
IL_000c: stloc.1
IL_000d: ldloc.1
IL_000e: ldfld ""int C1.F11""
IL_0013: ldc.i4.1
IL_0014: beq.s IL_002a
IL_0016: ldarga.s V_0
IL_0018: ldloca.s V_2
IL_001a: call ""bool S1.TryGetValue(out C2)""
IL_001f: brfalse.s IL_0033
IL_0021: ldloc.2
IL_0022: ldfld ""int C2.F2""
IL_0027: ldc.i4.2
IL_0028: bne.un.s IL_0033
IL_002a: ldloc.1
IL_002b: ldfld ""int C1.F12""
IL_0030: ldc.i4.3
IL_0031: beq.s IL_0037
IL_0033: ldc.i4.1
IL_0034: stloc.3
IL_0035: br.s IL_0039
IL_0037: ldc.i4.0
IL_0038: stloc.3
IL_0039: ldloc.3
IL_003a: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_60_TryGetValue()
{
var src = @"
class C1(int f1, int f2)
{
public int F11 = f1;
public int F12 = f2;
}
class C2(int f11, int f12, int f2) : C1(f11, f12)
{
public int F2 = f2;
}
class C3(int f1, int f2) : C1(f1, f2)
{
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out C1 x)
{
System.Console.Write(""TryGetValue(C1) "");
x = _value as C1;
return x != null;
}
public bool TryGetValue(out C2 x)
{
System.Console.Write(""TryGetValue(C2) "");
x = _value as C2;
return x != null;
}
public bool TryGetValue(out C3 x)
{
System.Console.Write(""TryGetValue(C3) "");
x = _value as C3;
return x != null;
}
static void Main()
{
S1[] s = [new S1(),
new S1(new C3(1, 1)), new S1(new C3(1, 3)), new S1(new C3(2, 3)), new S1(new C3(2, 4)),
new S1(new C2(1, 1, 1)), new S1(new C2(1, 3, 1)), new S1(new C2(2, 3, 1)), new S1(new C2(2, 4, 1)),
new S1(new C2(1, 1, 2)), new S1(new C2(1, 3, 2)), new S1(new C2(2, 3, 2)), new S1(new C2(2, 4, 2))];
foreach (var s1 in s)
{
var t = Test1(s1);
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
static bool Test1(S1 u)
{
return u is not ((C2 { F2: 2 } or C1 { F11: 1 }) and C1 { F12: 3 });
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: TryGetValue(C2): (Item1, ReturnItem) t1 = t0; [1]
[1]: t1.ReturnItem == True ? [2] : [11]
[2]: t2 = (C2)t1.Item1; [3]
[3]: t3 = t2.F2; [4]
[4]: t3 == 2 ? [5] : [6]
[5]: t4 = (C1)t1.Item1; [10]
[6]: t4 = (C1)t1.Item1; [7]
[7]: PassThrough t4; [8]
[8]: t6 = t4.F11; [9]
[9]: t6 == 1 ? [10] : [19]
[10]: PassThrough t4; [16]
[11]: TryGetValue(C1): (Item1, ReturnItem) t7 = t0; [12]
[12]: t7.ReturnItem == True ? [13] : [19]
[13]: t4 = (C1)t7.Item1; [14]
[14]: t6 = t4.F11; [15]
[15]: t6 == 1 ? [16] : [19]
[16]: t8 = t4.F12; [17]
[17]: t8 == 3 ? [18] : [19]
[18]: leaf <isPatternFailure> `u is not ((C2 { F2: 2 } or C1 { F11: 1 }) and C1 { F12: 3 })`
[19]: leaf <isPatternSuccess> `not ((C2 { F2: 2 } or C1 { F11: 1 }) and C1 { F12: 3 })`
",
forLowering: true);
var verifier = CompileAndVerify(comp, expectedOutput: @"
TryGetValue(C2) TryGetValue(C1)
True
TryGetValue(C2) TryGetValue(C1)
True
TryGetValue(C2) TryGetValue(C1)
False
TryGetValue(C2) TryGetValue(C1)
True
TryGetValue(C2) TryGetValue(C1)
True
TryGetValue(C2)
True
TryGetValue(C2)
False
TryGetValue(C2)
True
TryGetValue(C2)
True
TryGetValue(C2)
True
TryGetValue(C2)
False
TryGetValue(C2)
False
TryGetValue(C2)
True
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 76 (0x4c)
.maxstack 2
.locals init (C2 V_0,
C1 V_1,
C1 V_2,
bool V_3)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out C2)""
IL_0009: brfalse.s IL_0025
IL_000b: ldloc.0
IL_000c: ldfld ""int C2.F2""
IL_0011: ldc.i4.2
IL_0012: bne.un.s IL_0018
IL_0014: ldloc.0
IL_0015: stloc.1
IL_0016: br.s IL_003b
IL_0018: ldloc.0
IL_0019: stloc.1
IL_001a: ldloc.1
IL_001b: ldfld ""int C1.F11""
IL_0020: ldc.i4.1
IL_0021: bne.un.s IL_0044
IL_0023: br.s IL_003b
IL_0025: ldarga.s V_0
IL_0027: ldloca.s V_2
IL_0029: call ""bool S1.TryGetValue(out C1)""
IL_002e: brfalse.s IL_0044
IL_0030: ldloc.2
IL_0031: stloc.1
IL_0032: ldloc.1
IL_0033: ldfld ""int C1.F11""
IL_0038: ldc.i4.1
IL_0039: bne.un.s IL_0044
IL_003b: ldloc.1
IL_003c: ldfld ""int C1.F12""
IL_0041: ldc.i4.3
IL_0042: beq.s IL_0048
IL_0044: ldc.i4.1
IL_0045: stloc.3
IL_0046: br.s IL_004a
IL_0048: ldc.i4.0
IL_0049: stloc.3
IL_004a: ldloc.3
IL_004b: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_61_TryGetValue()
{
var src = @"
class C1(int f1, int f2)
{
public int F11 = f1;
public int F12 = f2;
}
class C2(int f11, int f12, int f2) : C1(f11, f12)
{
public int F2 = f2;
}
class C3(int f1, int f2) : C1(f1, f2)
{
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out C2 x)
{
System.Console.Write(""TryGetValue(C2) "");
x = _value as C2;
return x != null;
}
public bool TryGetValue(out C3 x)
{
System.Console.Write(""TryGetValue(C3) "");
x = _value as C3;
return x != null;
}
static void Main()
{
S1[] s = [new S1(),
new S1(new C3(1, 1)), new S1(new C3(1, 3)), new S1(new C3(2, 3)), new S1(new C3(2, 4)),
new S1(new C2(1, 1, 1)), new S1(new C2(1, 3, 1)), new S1(new C2(2, 3, 1)), new S1(new C2(2, 4, 1)),
new S1(new C2(1, 1, 2)), new S1(new C2(1, 3, 2)), new S1(new C2(2, 3, 2)), new S1(new C2(2, 4, 2))];
foreach (var s1 in s)
{
var t = Test1(s1);
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
static bool Test1(S1 u)
{
return u is not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 });
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Value; [1]
[1]: t1 is C1 ? [2] : [13]
[2]: t2 = (C1)t1; [3]
[3]: t3 = t2.F11; [4]
[4]: t3 == 1 ? [10] : [5]
[5]: TryGetValue(C2): (Item1, ReturnItem) t4 = t0; [6]
[6]: t4.ReturnItem == True ? [7] : [13]
[7]: t5 = (C2)t4.Item1; [8]
[8]: t6 = t5.F2; [9]
[9]: t6 == 2 ? [10] : [13]
[10]: t7 = t2.F12; [11]
[11]: t7 == 3 ? [12] : [13]
[12]: leaf <isPatternFailure> `u is not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 })`
[13]: leaf <isPatternSuccess> `not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 })`
",
forLowering: true);
var verifier = CompileAndVerify(comp, expectedOutput: @"
get_Value
True
get_Value
True
get_Value
False
get_Value TryGetValue(C2)
True
get_Value TryGetValue(C2)
True
get_Value
True
get_Value
False
get_Value TryGetValue(C2)
True
get_Value TryGetValue(C2)
True
get_Value
True
get_Value
False
get_Value TryGetValue(C2)
False
get_Value TryGetValue(C2)
True
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 62 (0x3e)
.maxstack 2
.locals init (C1 V_0,
C2 V_1,
bool V_2)
IL_0000: ldarga.s V_0
IL_0002: call ""object S1.Value.get""
IL_0007: isinst ""C1""
IL_000c: stloc.0
IL_000d: ldloc.0
IL_000e: brfalse.s IL_0036
IL_0010: ldloc.0
IL_0011: ldfld ""int C1.F11""
IL_0016: ldc.i4.1
IL_0017: beq.s IL_002d
IL_0019: ldarga.s V_0
IL_001b: ldloca.s V_1
IL_001d: call ""bool S1.TryGetValue(out C2)""
IL_0022: brfalse.s IL_0036
IL_0024: ldloc.1
IL_0025: ldfld ""int C2.F2""
IL_002a: ldc.i4.2
IL_002b: bne.un.s IL_0036
IL_002d: ldloc.0
IL_002e: ldfld ""int C1.F12""
IL_0033: ldc.i4.3
IL_0034: beq.s IL_003a
IL_0036: ldc.i4.1
IL_0037: stloc.2
IL_0038: br.s IL_003c
IL_003a: ldc.i4.0
IL_003b: stloc.2
IL_003c: ldloc.2
IL_003d: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_62_TryGetValue()
{
var src = @"
class C1(int f1, int f2)
{
public int F11 = f1;
public int F12 = f2;
}
class C2(int f11, int f12, int f2) : C1(f11, f12)
{
public int F2 = f2;
}
class C3(int f1, int f2) : C1(f1, f2)
{
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out C2 x)
{
System.Console.Write(""TryGetValue(C2) "");
x = _value as C2;
return x != null;
}
public bool TryGetValue(out C3 x)
{
System.Console.Write(""TryGetValue(C3) "");
x = _value as C3;
return x != null;
}
static void Main()
{
S1[] s = [new S1(),
new S1(new C3(1, 1)), new S1(new C3(1, 3)), new S1(new C3(2, 3)), new S1(new C3(2, 4)),
new S1(new C2(1, 1, 1)), new S1(new C2(1, 3, 1)), new S1(new C2(2, 3, 1)), new S1(new C2(2, 4, 1)),
new S1(new C2(1, 1, 2)), new S1(new C2(1, 3, 2)), new S1(new C2(2, 3, 2)), new S1(new C2(2, 4, 2))];
foreach (var s1 in s)
{
var t = Test1(s1);
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
static bool Test1(S1 u)
{
return u is not ((C2 { F2: 2 } or C1 { F11: 1 }) and C1 { F12: 3 });
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: TryGetValue(C2): (Item1, ReturnItem) t1 = t0; [1]
[1]: t1.ReturnItem == True ? [2] : [11]
[2]: t2 = (C2)t1.Item1; [3]
[3]: t3 = t2.F2; [4]
[4]: t3 == 2 ? [5] : [6]
[5]: t4 = (C1)t1.Item1; [10]
[6]: t4 = (C1)t1.Item1; [7]
[7]: PassThrough t4; [8]
[8]: t6 = t4.F11; [9]
[9]: t6 == 1 ? [10] : [19]
[10]: PassThrough t4; [16]
[11]: t7 = t0.Value; [12]
[12]: t7 is C1 ? [13] : [19]
[13]: t4 = (C1)t7; [14]
[14]: t6 = t4.F11; [15]
[15]: t6 == 1 ? [16] : [19]
[16]: t8 = t4.F12; [17]
[17]: t8 == 3 ? [18] : [19]
[18]: leaf <isPatternFailure> `u is not ((C2 { F2: 2 } or C1 { F11: 1 }) and C1 { F12: 3 })`
[19]: leaf <isPatternSuccess> `not ((C2 { F2: 2 } or C1 { F11: 1 }) and C1 { F12: 3 })`
",
forLowering: true);
var verifier = CompileAndVerify(comp, expectedOutput: @"
TryGetValue(C2) get_Value
True
TryGetValue(C2) get_Value
True
TryGetValue(C2) get_Value
False
TryGetValue(C2) get_Value
True
TryGetValue(C2) get_Value
True
TryGetValue(C2)
True
TryGetValue(C2)
False
TryGetValue(C2)
True
TryGetValue(C2)
True
TryGetValue(C2)
True
TryGetValue(C2)
False
TryGetValue(C2)
False
TryGetValue(C2)
True
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 79 (0x4f)
.maxstack 2
.locals init (C2 V_0,
C1 V_1,
bool V_2)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out C2)""
IL_0009: brfalse.s IL_0025
IL_000b: ldloc.0
IL_000c: ldfld ""int C2.F2""
IL_0011: ldc.i4.2
IL_0012: bne.un.s IL_0018
IL_0014: ldloc.0
IL_0015: stloc.1
IL_0016: br.s IL_003e
IL_0018: ldloc.0
IL_0019: stloc.1
IL_001a: ldloc.1
IL_001b: ldfld ""int C1.F11""
IL_0020: ldc.i4.1
IL_0021: bne.un.s IL_0047
IL_0023: br.s IL_003e
IL_0025: ldarga.s V_0
IL_0027: call ""object S1.Value.get""
IL_002c: isinst ""C1""
IL_0031: stloc.1
IL_0032: ldloc.1
IL_0033: brfalse.s IL_0047
IL_0035: ldloc.1
IL_0036: ldfld ""int C1.F11""
IL_003b: ldc.i4.1
IL_003c: bne.un.s IL_0047
IL_003e: ldloc.1
IL_003f: ldfld ""int C1.F12""
IL_0044: ldc.i4.3
IL_0045: beq.s IL_004b
IL_0047: ldc.i4.1
IL_0048: stloc.2
IL_0049: br.s IL_004d
IL_004b: ldc.i4.0
IL_004c: stloc.2
IL_004d: ldloc.2
IL_004e: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_63_TryGetValue()
{
var src = @"
class C1(int f1, int f2)
{
public int F11 = f1;
public int F12 = f2;
}
class C2(int f11, int f12, int f2) : C1(f11, f12)
{
public int F2 = f2;
}
class C3(int f1, int f2) : C1(f1, f2)
{
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out C1 x)
{
System.Console.Write(""TryGetValue(C1) "");
x = _value as C1;
return x != null;
}
public bool TryGetValue(out C3 x)
{
System.Console.Write(""TryGetValue(C3) "");
x = _value as C3;
return x != null;
}
static void Main()
{
S1[] s = [new S1(),
new S1(new C3(1, 1)), new S1(new C3(1, 3)), new S1(new C3(2, 3)), new S1(new C3(2, 4)),
new S1(new C2(1, 1, 1)), new S1(new C2(1, 3, 1)), new S1(new C2(2, 3, 1)), new S1(new C2(2, 4, 1)),
new S1(new C2(1, 1, 2)), new S1(new C2(1, 3, 2)), new S1(new C2(2, 3, 2)), new S1(new C2(2, 4, 2))];
foreach (var s1 in s)
{
var t = Test1(s1);
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
static bool Test1(S1 u)
{
return u is not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 });
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: TryGetValue(C1): (Item1, ReturnItem) t1 = t0; [1]
[1]: t1.ReturnItem == True ? [2] : [13]
[2]: t2 = (C1)t1.Item1; [3]
[3]: t3 = t2.F11; [4]
[4]: t3 == 1 ? [10] : [5]
[5]: t4 = t0.Value; [6]
[6]: t4 is C2 ? [7] : [13]
[7]: t5 = (C2)t4; [8]
[8]: t6 = t5.F2; [9]
[9]: t6 == 2 ? [10] : [13]
[10]: t7 = t2.F12; [11]
[11]: t7 == 3 ? [12] : [13]
[12]: leaf <isPatternFailure> `u is not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 })`
[13]: leaf <isPatternSuccess> `not ((C1 { F11: 1 } or C2 { F2: 2 }) and C1 { F12: 3 })`
",
forLowering: true);
var verifier = CompileAndVerify(comp, expectedOutput: @"
TryGetValue(C1)
True
TryGetValue(C1)
True
TryGetValue(C1)
False
TryGetValue(C1) get_Value
True
TryGetValue(C1) get_Value
True
TryGetValue(C1)
True
TryGetValue(C1)
False
TryGetValue(C1) get_Value
True
TryGetValue(C1) get_Value
True
TryGetValue(C1)
True
TryGetValue(C1)
False
TryGetValue(C1) get_Value
False
TryGetValue(C1) get_Value
True
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 64 (0x40)
.maxstack 2
.locals init (C1 V_0,
C1 V_1,
C2 V_2,
bool V_3)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out C1)""
IL_0009: brfalse.s IL_0038
IL_000b: ldloc.0
IL_000c: stloc.1
IL_000d: ldloc.1
IL_000e: ldfld ""int C1.F11""
IL_0013: ldc.i4.1
IL_0014: beq.s IL_002f
IL_0016: ldarga.s V_0
IL_0018: call ""object S1.Value.get""
IL_001d: isinst ""C2""
IL_0022: stloc.2
IL_0023: ldloc.2
IL_0024: brfalse.s IL_0038
IL_0026: ldloc.2
IL_0027: ldfld ""int C2.F2""
IL_002c: ldc.i4.2
IL_002d: bne.un.s IL_0038
IL_002f: ldloc.1
IL_0030: ldfld ""int C1.F12""
IL_0035: ldc.i4.3
IL_0036: beq.s IL_003c
IL_0038: ldc.i4.1
IL_0039: stloc.3
IL_003a: br.s IL_003e
IL_003c: ldc.i4.0
IL_003d: stloc.3
IL_003e: ldloc.3
IL_003f: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_64_TryGetValue()
{
var src = @"
class C1(int f1, int f2)
{
public int F11 = f1;
public int F12 = f2;
}
class C2(int f11, int f12, int f2) : C1(f11, f12)
{
public int F2 = f2;
}
class C3(int f1, int f2) : C1(f1, f2)
{
}
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(C1 x) { _value = x; }
public S1(C2 x) { _value = x; }
public S1(C3 x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out C1 x)
{
System.Console.Write(""TryGetValue(C1) "");
x = _value as C1;
return x != null;
}
public bool TryGetValue(out C3 x)
{
System.Console.Write(""TryGetValue(C3) "");
x = _value as C3;
return x != null;
}
static void Main()
{
S1[] s = [new S1(),
new S1(new C3(1, 1)), new S1(new C3(1, 3)), new S1(new C3(2, 3)), new S1(new C3(2, 4)),
new S1(new C2(1, 1, 1)), new S1(new C2(1, 3, 1)), new S1(new C2(2, 3, 1)), new S1(new C2(2, 4, 1)),
new S1(new C2(1, 1, 2)), new S1(new C2(1, 3, 2)), new S1(new C2(2, 3, 2)), new S1(new C2(2, 4, 2))];
foreach (var s1 in s)
{
var t = Test1(s1);
System.Console.WriteLine();
System.Console.WriteLine(t);
}
}
static bool Test1(S1 u)
{
return u is not ((C2 { F2: 2 } or C1 { F11: 1 }) and C1 { F12: 3 });
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
VerifyDecisionDagDump<IsPatternExpressionSyntax>(comp,
@"[0]: t1 = t0.Value; [1]
[1]: t1 is C2 ? [2] : [8]
[2]: t2 = (C2)t1; [3]
[3]: t3 = t2.F2; [4]
[4]: t3 == 2 ? [5] : [6]
[5]: t4 = (C1)t1; [13]
[6]: t4 = (C1)t1; [7]
[7]: PassThrough t4; [11]
[8]: TryGetValue(C1): (Item1, ReturnItem) t6 = t0; [9]
[9]: t6.ReturnItem == True ? [10] : [16]
[10]: t4 = (C1)t6.Item1; [11]
[11]: t7 = t4.F11; [12]
[12]: t7 == 1 ? [13] : [16]
[13]: t8 = t4.F12; [14]
[14]: t8 == 3 ? [15] : [16]
[15]: leaf <isPatternFailure> `u is not ((C2 { F2: 2 } or C1 { F11: 1 }) and C1 { F12: 3 })`
[16]: leaf <isPatternSuccess> `not ((C2 { F2: 2 } or C1 { F11: 1 }) and C1 { F12: 3 })`
",
forLowering: true);
var verifier = CompileAndVerify(comp, expectedOutput: @"
get_Value TryGetValue(C1)
True
get_Value TryGetValue(C1)
True
get_Value TryGetValue(C1)
False
get_Value TryGetValue(C1)
True
get_Value TryGetValue(C1)
True
get_Value
True
get_Value
False
get_Value
True
get_Value
True
get_Value
True
get_Value
False
get_Value
False
get_Value
True
").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 87 (0x57)
.maxstack 2
.locals init (object V_0,
C2 V_1,
C1 V_2,
C1 V_3,
bool V_4)
IL_0000: ldarga.s V_0
IL_0002: call ""object S1.Value.get""
IL_0007: stloc.0
IL_0008: ldloc.0
IL_0009: isinst ""C2""
IL_000e: stloc.1
IL_000f: ldloc.1
IL_0010: brfalse.s IL_002d
IL_0012: ldloc.1
IL_0013: ldfld ""int C2.F2""
IL_0018: ldc.i4.2
IL_0019: bne.un.s IL_0024
IL_001b: ldloc.0
IL_001c: castclass ""C1""
IL_0021: stloc.2
IL_0022: br.s IL_0043
IL_0024: ldloc.0
IL_0025: castclass ""C1""
IL_002a: stloc.2
IL_002b: br.s IL_003a
IL_002d: ldarga.s V_0
IL_002f: ldloca.s V_3
IL_0031: call ""bool S1.TryGetValue(out C1)""
IL_0036: brfalse.s IL_004c
IL_0038: ldloc.3
IL_0039: stloc.2
IL_003a: ldloc.2
IL_003b: ldfld ""int C1.F11""
IL_0040: ldc.i4.1
IL_0041: bne.un.s IL_004c
IL_0043: ldloc.2
IL_0044: ldfld ""int C1.F12""
IL_0049: ldc.i4.3
IL_004a: beq.s IL_0051
IL_004c: ldc.i4.1
IL_004d: stloc.s V_4
IL_004f: br.s IL_0054
IL_0051: ldc.i4.0
IL_0052: stloc.s V_4
IL_0054: ldloc.s V_4
IL_0056: ret
}
");
}
[Fact]
public void NonBoxingUnionMatching_65_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(System.Runtime.CompilerServices.ITuple x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out System.Runtime.CompilerServices.ITuple x)
{
System.Console.Write(""TryGetValue(ITuple) "");
x = _value as System.Runtime.CompilerServices.ITuple;
return x != null;
}
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(' ');
System.Console.Write(Test1(default));
System.Console.Write(' ');
System.Console.Write(Test1(new S1(new C())));
}
static bool Test1(S1 u)
{
return u is (_, 10);
}
}
public class C : System.Runtime.CompilerServices.ITuple
{
int System.Runtime.CompilerServices.ITuple.Length => 2;
object System.Runtime.CompilerServices.ITuple.this[int i] => i * 10;
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(comp, expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TryGetValue(ITuple) False TryGetValue(ITuple) False TryGetValue(ITuple) True" : null, verify: Verification.FailsPEVerify).VerifyDiagnostics();
}
[Fact]
public void NonBoxingUnionMatching_66_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(S2<int> x) { _value = x; }
public S1(S2<string> x) { _value = x; }
public S1(S2<object> x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out S2<int> x)
{
System.Console.Write(""TryGetValue(S2<int>) "");
if (_value is S2<int> s2)
{
x = s2;
return true;
}
x = default;
return false;
}
public bool TryGetValue(out S2<string> x)
{
System.Console.Write(""TryGetValue(S2<string>) "");
if (_value is S2<string> s2)
{
x = s2;
return true;
}
x = default;
return false;
}
public bool TryGetValue(out S2<object> x)
{
System.Console.Write(""TryGetValue(S2<object>) "");
if (_value is S2<object> s2)
{
x = s2;
return true;
}
x = default;
return false;
}
}
struct S2<T>
{
public T Value;
public void Deconstruct(out T value, out int x)
{
value = Value;
x = 0;
}
}
class A;
class B;
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(' ');
System.Console.Write(Test1(default));
System.Console.Write(' ');
System.Console.Write(Test1(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(' ');
System.Console.Write(Test1(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(' ');
System.Console.Write(' ');
System.Console.Write(Test2(new S1(new S2<int>() { Value = 10 })));
System.Console.Write(' ');
System.Console.Write(Test2(default));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(new S2<string>() { Value = ""11"" })));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(new S2<int>() { Value = 0 })));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(' ');
System.Console.Write(' ');
System.Console.Write(Test3(new S1(new S2<int>() { Value = 11 })));
System.Console.Write(' ');
System.Console.Write(Test3(default));
System.Console.Write(' ');
System.Console.Write(Test3(new S1(new S2<string>() { Value = ""11"" })));
}
static bool Test1(S1 u)
{
return u is S2<int> (10, _);
}
static bool Test2(S1 u)
{
return u is S2<int> (10 or 11, _);
}
static bool Test3(S1 u)
{
return u is S2<string> (""11"", _) and (['1', '1'], _);
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetCoreApp, options: TestOptions.ReleaseExe);
CompileAndVerify(
comp,
expectedOutput: ExecutionConditionUtil.IsMonoOrCoreClr ? "TryGetValue(S2<int>) True TryGetValue(S2<int>) False TryGetValue(S2<int>) False TryGetValue(S2<int>) False TryGetValue(S2<int>) True TryGetValue(S2<int>) False TryGetValue(S2<int>) False TryGetValue(S2<int>) False TryGetValue(S2<int>) True TryGetValue(S2<string>) False TryGetValue(S2<string>) False TryGetValue(S2<string>) True" : null,
verify: Verification.FailsPEVerify).VerifyDiagnostics();
}
[Fact]
public void NonBoxingUnionMatching_67_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue(int) "");
if (_value is int s2)
{
x = s2;
return true;
}
x = default;
return false;
}
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(' ');
System.Console.Write(Test1(default));
System.Console.Write(' ');
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(' ');
System.Console.Write(Test2(default));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(11)));
}
static bool Test1(S1 u)
{
return u is int x;
}
static bool Test2(S1 u)
{
return u is int x ? (x == 10 || x == 11) : false;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], targetFramework: TargetFramework.NetLatest, options: TestOptions.ReleaseExe);
CompileAndVerify(
comp,
expectedOutput: "TryGetValue(int) True TryGetValue(int) False TryGetValue(int) False TryGetValue(int) True TryGetValue(int) True TryGetValue(int) False TryGetValue(int) False TryGetValue(int) False TryGetValue(int) True"
).VerifyDiagnostics();
}
[Fact]
public void NonBoxingUnionMatching_68_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int x) { _value = x; }
public S1(string x) { _value = x; }
public object Value
{
get
{
System.Console.Write(""get_Value "");
return _value;
}
}
public bool TryGetValue(out int x)
{
System.Console.Write(""TryGetValue(int) "");
if (_value is int s2)
{
x = s2;
return true;
}
x = default;
return false;
}
}
class Program
{
static void Main()
{
System.Console.Write(Test1(new S1(10)));
System.Console.Write(' ');
System.Console.Write(Test1(default));
System.Console.Write(' ');
System.Console.Write(Test1(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test1(new S1(0)));
System.Console.Write(' ');
System.Console.Write(' ');
System.Console.Write(Test2(new S1(10)));
System.Console.Write(' ');
System.Console.Write(Test2(default));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(""11"")));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(0)));
System.Console.Write(' ');
System.Console.Write(Test2(new S1(11)));
}
static bool Test1(S1 u)
{
return u is >=10;
}
static bool Test2(S1 u)
{
return u is <10 or 11;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
CompileAndVerify(
comp,
expectedOutput: "TryGetValue(int) True TryGetValue(int) False TryGetValue(int) False TryGetValue(int) False TryGetValue(int) False TryGetValue(int) False TryGetValue(int) False TryGetValue(int) True TryGetValue(int) True"
).VerifyDiagnostics();
}
[Fact]
public void NonBoxingUnionMatching_69_TryGetValue_NullableAnalysis()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
public bool TryGetValue(out string? x) => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s.TryGetValue(out var value))
{
#line 100
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 200
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
static void Test4(S1 s)
{
if (!s.TryGetValue(out var value))
{
#line 300
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 400
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(200, 13),
// (201,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(201, 19),
// (300,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(300, 13),
// (301,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 19)
);
}
[Fact]
public void NonBoxingUnionMatching_70_TryGetValue_NullableAnalysis()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
public bool TryGetValue(out string? x) => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s.Value is null) return;
if (s.TryGetValue(out var value))
{
#line 100
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 200
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
static void Test4(S1 s)
{
if (s.Value is null) return;
if (!s.TryGetValue(out var value))
{
#line 300
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 400
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(200, 13),
// (300,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(300, 13)
);
}
[Fact]
public void NonBoxingUnionMatching_71_TryGetValue_NullableAnalysis()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
[System.Diagnostics.CodeAnalysis.MemberNotNullWhen(true, nameof(Value))]
public bool TryGetValue([System.Diagnostics.CodeAnalysis.NotNullWhen(true)]out string? x) => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s.TryGetValue(out var value))
{
#line 100
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 200
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
static void Test4(S1 s)
{
if (!s.TryGetValue(out var value))
{
#line 300
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 400
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, MemberNotNullWhenAttributeDefinition, NotNullWhenAttributeDefinition]);
comp.VerifyDiagnostics(
// (200,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(200, 13),
// (201,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(201, 19),
// (300,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(300, 13),
// (301,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 19)
);
}
[Fact]
public void NonBoxingUnionMatching_72_TryGetValue_NullableAnalysis()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
[System.Diagnostics.CodeAnalysis.MemberNotNullWhen(true, nameof(Value))]
public bool TryGetValue([System.Diagnostics.CodeAnalysis.NotNullWhen(true)]out string? x) => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s.Value is null) return;
if (s.TryGetValue(out var value))
{
#line 100
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 200
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
static void Test4(S1 s)
{
if (s.Value is null) return;
if (!s.TryGetValue(out var value))
{
#line 300
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 400
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource, MemberNotNullWhenAttributeDefinition, NotNullWhenAttributeDefinition]);
comp.VerifyDiagnostics(
// (200,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(200, 13),
// (300,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(300, 13)
);
}
[Fact]
public void NonBoxingUnionMatching_73_TryGetValue_NullableAnalysis()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1
{
public S1(int? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
public bool TryGetValue(out string? x) => throw null!;
}
class Program
{
static void Test2(S1 s)
{
if (s.TryGetValue(out var value))
{
#line 100
value.ToString();
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 200
value.ToString();
_ = s switch { int => 1, bool => 3 };
}
}
static void Test4(S1 s)
{
if (!s.TryGetValue(out var value))
{
#line 300
value.ToString();
_ = s switch { int => 1, bool => 3 };
}
else
{
#line 400
value.ToString();
_ = s switch { int => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(100, 13),
// (101,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(101, 19),
// (200,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(200, 13),
// (201,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(201, 19),
// (300,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(300, 13),
// (301,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 19),
// (400,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(400, 13),
// (401,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { int => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(401, 19)
);
}
[Fact]
public void NonBoxingUnionMatching_74_TryGetValue_NullableAnalysis_Generic()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1<T>
{
public S1(T x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
public bool TryGetValue(out T x) => throw null!;
}
class Program
{
static void Test2(S1<string?> s)
{
if (s.TryGetValue(out var value))
{
#line 100
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 200
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
static void Test4(S1<string?> s)
{
if (!s.TryGetValue(out var value))
{
#line 300
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 400
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (200,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(200, 13),
// (201,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(201, 19),
// (300,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(300, 13),
// (301,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 19)
);
}
[Fact]
public void NonBoxingUnionMatching_75_TryGetValue_NullableAnalysis_Generic()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1<T>
{
public S1(T x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
public bool TryGetValue(out string? x) => throw null!;
}
class Program
{
static void Test2(S1<string?> s)
{
if (s.TryGetValue(out var value))
{
#line 100
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 200
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
static void Test4(S1<string?> s)
{
if (!s.TryGetValue(out var value))
{
#line 300
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 400
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(100, 13),
// (101,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(101, 19),
// (200,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(200, 13),
// (201,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(201, 19),
// (300,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(300, 13),
// (301,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 19),
// (400,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(400, 13),
// (401,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(401, 19)
);
}
[Fact]
public void NonBoxingUnionMatching_76_TryGetValue_NullableAnalysis_Generic()
{
var src = @"
#nullable enable
[System.Runtime.CompilerServices.Union]
struct S1<T>
{
public S1(string? x) => throw null!;
public S1(bool? x) => throw null!;
public object? Value => throw null!;
public T TryGetValue(out string? x) => throw null!;
}
class Program
{
static void Test2(S1<bool> s)
{
if (s.TryGetValue(out var value))
{
#line 100
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 200
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
static void Test4(S1<bool> s)
{
if (!s.TryGetValue(out var value))
{
#line 300
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
else
{
#line 400
value.ToString();
_ = s switch { string => 1, bool => 3 };
}
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (100,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(100, 13),
// (101,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(101, 19),
// (200,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(200, 13),
// (201,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(201, 19),
// (300,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(300, 13),
// (301,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(301, 19),
// (400,13): warning CS8602: Dereference of a possibly null reference.
// value.ToString();
Diagnostic(ErrorCode.WRN_NullReferenceReceiver, "value").WithLocation(400, 13),
// (401,19): warning CS8655: The switch expression does not handle some null inputs (it is not exhaustive). For example, the pattern 'null' is not covered.
// _ = s switch { string => 1, bool => 3 };
Diagnostic(ErrorCode.WRN_SwitchExpressionNotExhaustiveForNull, "switch").WithArguments("null").WithLocation(401, 19)
);
}
[Fact]
public void NonBoxingUnionMatching_77_TryGetValue()
{
var src = @"
[System.Runtime.CompilerServices.Union]
struct S1
{
private readonly object _value;
public S1(int? x) { _value = x; }
public S1(string x) { _value = x; }
public object Value => _value;
public bool TryGetValue(out int x) { if (_value is int v) { x = v; return true; } x = 0; return false; }
static void Main()
{
System.Console.Write(Test1(new S1(1)));
System.Console.Write(Test1(new S1()));
System.Console.Write(Test1(new S1(""a"")));
System.Console.Write(Test2(new S1(2)));
System.Console.Write(Test2(new S1()));
System.Console.Write(Test2(new S1(""b"")));
}
static bool Test1(S1 u)
{
return u is int;
}
static bool Test2(S1 u)
{
return u is not int;
}
}
";
var comp = CreateCompilation([src, UnionAttributeSource], options: TestOptions.ReleaseExe);
var verifier = CompileAndVerify(comp, expectedOutput: "TrueFalseFalseFalseTrueTrue").VerifyDiagnostics();
verifier.VerifyIL("S1.Test1", @"
{
// Code size 10 (0xa)
.maxstack 2
.locals init (int V_0)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out int)""
IL_0009: ret
}
");
verifier.VerifyIL("S1.Test2", @"
{
// Code size 13 (0xd)
.maxstack 2
.locals init (int V_0)
IL_0000: ldarga.s V_0
IL_0002: ldloca.s V_0
IL_0004: call ""bool S1.TryGetValue(out int)""
IL_0009: ldc.i4.0
IL_000a: ceq
IL_000c: ret
}
");
}
[Fact]
public void UnionDeclaration_01()
{
var unionSrc = @"
public
#line 100
union S1(bool, int)
{
}
";
var consumer = @"
class Program
{
static void Main()
{
System.Console.Write(Test(10));
System.Console.Write(Test(11));
System.Console.Write(Test(true));
System.Console.Write(Test(false));
System.Console.Write(Test(default));
}
static int Test(S1 u)
{
return u switch
{
10 => 1,
true => 2,
int => 3,
bool => 4,
_ => 5
};
}
}
";
var comp1 = CreateCompilation([unionSrc, UnionAttributeSource, IUnionSource, consumer], options: TestOptions.DebugExe);
var s1 = comp1.GetTypeByMetadataName("S1");
Assert.True(s1.IsUnionType);
Assert.False(s1.IsRecordStruct);
Assert.False(s1.IsRecord);
VerifyCaseTypes(comp1, "S1", ["System.Boolean", "System.Int32"]);
var members = s1.GetMembers();
Assert.Equal(6, members.Length);
AssertEx.SequenceEqual(["System.Object? S1.Value.field", "System.Object? S1.Value { get; }", "readonly System.Object? S1.Value.get",
"S1.S1(System.Boolean value)", "S1.S1(System.Int32 value)", "S1.S1()"],
members.Select(s => s.ToTestDisplayString(includeNonNullable: true)));
Assert.False(members[0].IsStatic);
Assert.True(members[0].IsImplicitlyDeclared);
Assert.False(members[1].IsStatic);
Assert.True(members[1].IsImplicitlyDeclared);
Assert.False(members[2].IsStatic);
Assert.True(members[2].IsImplicitlyDeclared);
Assert.False(members[^3].IsStatic);
Assert.True(members[^3].IsImplicitlyDeclared);
Assert.False(members[^2].IsStatic);
Assert.True(members[^2].IsImplicitlyDeclared);
var tree = comp1.SyntaxTrees.First();
var model = comp1.GetSemanticModel(tree);
var s1Decl = tree.GetRoot().DescendantNodes().OfType<TypeDeclarationSyntax>().Single();
Assert.Equal("S1", s1Decl.Identifier.ToString());
Assert.Empty(members[0].DeclaringSyntaxReferences);
Assert.Equal(s1Decl, members[1].DeclaringSyntaxReferences.Single().GetSyntax());
Assert.Equal(s1Decl, members[2].DeclaringSyntaxReferences.Single().GetSyntax());
Assert.Empty(members[^3].DeclaringSyntaxReferences);
Assert.Empty(members[^2].DeclaringSyntaxReferences);
var location = members[0].Locations.Single();
Assert.Equal(members[1].Locations.Single(), location);
location = members[1].Locations.Single();
Assert.Equal(s1Decl, location.SourceTree.GetRoot().FindNode(location.SourceSpan));
location = members[2].Locations.Single();
Assert.Equal(s1Decl, location.SourceTree.GetRoot().FindNode(location.SourceSpan));
location = members[^3].Locations.Single();
Assert.Equal("bool", location.SourceTree.GetRoot().FindNode(location.SourceSpan).ToString());
location = members[^2].Locations.Single();
Assert.Equal("int", location.SourceTree.GetRoot().FindNode(location.SourceSpan).ToString());
Assert.Same(s1, model.GetDeclaredSymbol(s1Decl).GetSymbol());
Assert.Null(model.GetDeclaredSymbol(s1Decl.ParameterList));
Assert.Null(model.GetDeclaredSymbol(s1Decl.ParameterList.Parameters[0]));
Assert.Null(model.GetDeclaredSymbol(s1Decl.ParameterList.Parameters[0].Type));
Assert.Null(model.GetDeclaredSymbol(s1Decl.ParameterList.Parameters[1]));
Assert.Null(model.GetDeclaredSymbol(s1Decl.ParameterList.Parameters[1].Type));
var typeInfo = model.GetTypeInfo(s1Decl.ParameterList.Parameters[0].Type);
Assert.Equal("System.Boolean", typeInfo.Type.ToTestDisplayString());
Assert.Equal("System.Boolean", typeInfo.ConvertedType.ToTestDisplayString());
typeInfo = model.GetTypeInfo(s1Decl.ParameterList.Parameters[1].Type);
Assert.Equal("System.Int32", typeInfo.Type.ToTestDisplayString());
Assert.Equal("System.Int32", typeInfo.ConvertedType.ToTestDisplayString());
var verifier = CompileAndVerify(comp1, expectedOutput: "13245").VerifyDiagnostics();
verifier.VerifyTypeIL("S1", @"
.class public sequential ansi sealed beforefieldinit S1
extends [netstandard]System.ValueType
implements System.Runtime.CompilerServices.IUnion
{
.custom instance void System.Runtime.CompilerServices.NullableContextAttribute::.ctor(uint8) = (
01 00 02 00 00
)
.custom instance void System.Runtime.CompilerServices.NullableAttribute::.ctor(uint8) = (
01 00 00 00 00
)
.custom instance void System.Runtime.CompilerServices.UnionAttribute::.ctor() = (
01 00 00 00
)
.interfaceimpl type System.Runtime.CompilerServices.IUnion
.custom instance void System.Runtime.CompilerServices.NullableAttribute::.ctor(uint8) = (
01 00 00 00 00
)
// Fields
.field private initonly object '<Value>k__BackingField'
.custom instance void [netstandard]System.Runtime.CompilerServices.CompilerGeneratedAttribute::.ctor() = (
01 00 00 00
)
.custom instance void [netstandard]System.Diagnostics.DebuggerBrowsableAttribute::.ctor(valuetype [netstandard]System.Diagnostics.DebuggerBrowsableState) = (
01 00 00 00 00 00 00 00
)
// Methods
.method public final hidebysig specialname newslot virtual
instance object get_Value () cil managed
{
.custom instance void System.Runtime.CompilerServices.IsReadOnlyAttribute::.ctor() = (
01 00 00 00
)
.custom instance void [netstandard]System.Runtime.CompilerServices.CompilerGeneratedAttribute::.ctor() = (
01 00 00 00
)
// Method begins at RVA 0x20a2
// Code size 7 (0x7)
.maxstack 8
IL_0000: ldarg.0
IL_0001: ldfld object S1::'<Value>k__BackingField'
IL_0006: ret
} // end of method S1::get_Value
.method public hidebysig specialname rtspecialname
instance void .ctor (
bool 'value'
) cil managed
{
.custom instance void [netstandard]System.Runtime.CompilerServices.CompilerGeneratedAttribute::.ctor() = (
01 00 00 00
)
// Method begins at RVA 0x20aa
// Code size 14 (0xe)
.maxstack 8
IL_0000: ldarg.0
IL_0001: ldarg.1
IL_0002: box [netstandard]System.Boolean
IL_0007: stfld object S1::'<Value>k__BackingField'
IL_000c: nop
IL_000d: ret
} // end of method S1::.ctor
.method public hidebysig specialname rtspecialname
instance void .ctor (
int32 'value'
) cil managed
{
.custom instance void [netstandard]System.Runtime.CompilerServices.CompilerGeneratedAttribute::.ctor() = (
01 00 00 00
)
// Method begins at RVA 0x20b9
// Code size 14 (0xe)
.maxstack 8
IL_0000: ldarg.0
IL_0001: ldarg.1
IL_0002: box [netstandard]System.Int32
IL_0007: stfld object S1::'<Value>k__BackingField'
IL_000c: nop
IL_000d: ret
} // end of method S1::.ctor
// Properties
.property instance object Value()
{
.get instance object S1::get_Value()
}
} // end of class S1
".Replace("[netstandard]", ExecutionConditionUtil.IsMonoOrCoreClr ? "[netstandard]" : "[mscorlib]"));
var comp2 = CreateCompilation(consumer, references: [verifier.GetImageReference()], options: TestOptions.DebugExe);
var s12 = comp2.GetTypeByMetadataName("S1");
Assert.True(s12.IsUnionType);
VerifyCaseTypes(comp2, "S1", ["System.Boolean", "System.Int32"]);
members = s12.GetMembers();
AssertEx.SequenceEqual(["System.Object? S1.<Value>k__BackingField", "S1.S1()", "readonly System.Object? S1.Value.get",
"S1.S1(System.Boolean value)", "S1.S1(System.Int32 value)", "readonly System.Object? S1.Value { get; }"],
members.Select(s => s.ToTestDisplayString(includeNonNullable: true)));
CompileAndVerify(comp2, expectedOutput: "13245").VerifyDiagnostics();
var unionAttributeSource = @"
namespace System.Runtime.CompilerServices
{
public class UnionAttribute : System.Attribute
{
}
}
";
var ref1 = CreateCompilation(unionAttributeSource).EmitToImageReference();
var ref2 = CreateCompilation(unionAttributeSource).EmitToImageReference();
var comp3 = CreateCompilation([unionSrc, IUnionSource], references: [ref1, ref2]);
comp3.VerifyEmitDiagnostics(
// (100,7): error CS0656: Missing compiler required member 'System.Runtime.CompilerServices.UnionAttribute..ctor'
// union S1(bool, int)
Diagnostic(ErrorCode.ERR_MissingPredefinedMember, "S1").WithArguments("System.Runtime.CompilerServices.UnionAttribute", ".ctor").WithLocation(100, 7)
);
var comp4 = CreateCompilation(["extern alias ref1; [ref1::System.Runtime.CompilerServices.Union]" + unionSrc, IUnionSource], references: [ref1.WithAliases(["ref1"]), ref2.WithAliases(["ref2"])]);
verifier = CompileAndVerify(
comp4,
symbolValidator: (m) =>
{
var s1 = m.GlobalNamespace.GetTypeMember("S1");
Assert.Equal("S1", s1.Name);
CSharpAttributeData attr = s1.GetAttributes().Where(a => a.AttributeClass.Name.StartsWith("Union")).Single();
AssertEx.Equal("System.Runtime.CompilerServices.UnionAttribute", attr.ToString());
Assert.NotEqual(s1.ContainingModule, attr.AttributeClass.ContainingModule);
}).VerifyDiagnostics();
var comp5 = CreateCompilation(consumer, references: [verifier.GetImageReference()], options: TestOptions.DebugExe);
CompileAndVerify(comp5, expectedOutput: "13245").VerifyDiagnostics();
var comp6 = CreateCompilation(["[System.Runtime.CompilerServices.Union]" + unionSrc, UnionAttributeSource, IUnionSource], references: [ref1.WithAliases(["ref1"]), ref2.WithAliases(["ref2"])]);
verifier = CompileAndVerify(
comp6,
symbolValidator: (m) =>
{
var s1 = m.GlobalNamespace.GetTypeMember("S1");
Assert.Equal("S1", s1.Name);
CSharpAttributeData attr = s1.GetAttributes().Where(a => a.AttributeClass.Name.StartsWith("Union")).Single();
AssertEx.Equal("System.Runtime.CompilerServices.UnionAttribute", attr.ToString());
Assert.Same(s1.ContainingModule, attr.AttributeClass.ContainingModule);
}).VerifyDiagnostics();
var comp7 = CreateCompilation(consumer, references: [verifier.GetImageReference()], options: TestOptions.DebugExe);
CompileAndVerify(comp7, expectedOutput: "13245").VerifyDiagnostics();
}
[Fact]
public void UnionDeclaration_02()
{
var src = @"
partial
#line 100
union S1(int, bool)
{
}
partial
#line 200
union S1(int, long)
{
}
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
comp.VerifyEmitDiagnostics(
// (200,9): error CS8863: Only a single partial type declaration may have a parameter list
// union S1(int, long)
Diagnostic(ErrorCode.ERR_MultipleRecordParameterLists, "(int, long)").WithLocation(200, 9)
);
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
VerifyCaseTypes(comp, "S1", ["System.Int32", "System.Boolean"]);
}
[Fact]
public void UnionDeclaration_03()
{
var src = @"
partial union S1(int, bool)
{
}
partial union S1
{
}
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
comp.VerifyEmitDiagnostics();
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
VerifyCaseTypes(comp, "S1", ["System.Int32", "System.Boolean"]);
}
[Fact]
public void UnionDeclaration_04()
{
var src = @"
partial union S1
{
}
partial union S1(int, bool)
{
}
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
comp.VerifyEmitDiagnostics();
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
VerifyCaseTypes(comp, "S1", ["System.Int32", "System.Boolean"]);
}
[Fact]
public void UnionDeclaration_05()
{
var src = @"
partial struct S1
{
}
partial union S1(int, bool)
{
}
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
comp.VerifyEmitDiagnostics(
// (6,15): error CS0261: Partial declarations of 'S1' must be all classes, all record classes, all structs, all unions, all record structs, or all interfaces
// partial union S1(int, bool)
Diagnostic(ErrorCode.ERR_PartialTypeKindConflict, "S1").WithArguments("S1").WithLocation(6, 15)
);
}
[Fact]
public void UnionDeclaration_06()
{
var src = @"
partial union S1(int, bool)
{
}
partial record S1
{
}
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
comp.VerifyEmitDiagnostics(
// (6,16): error CS0261: Partial declarations of 'S1' must be all classes, all record classes, all structs, all unions, all record structs, or all interfaces
// partial record S1
Diagnostic(ErrorCode.ERR_PartialTypeKindConflict, "S1").WithArguments("S1").WithLocation(6, 16)
);
}
[Fact]
public void UnionDeclaration_07()
{
var src = @"
static union S1(int, bool)
{
}
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
comp.VerifyEmitDiagnostics(
// (2,14): error CS0106: The modifier 'static' is not valid for this item
// static union S1(int, bool)
Diagnostic(ErrorCode.ERR_BadMemberFlag, "S1").WithArguments("static").WithLocation(2, 14)
);
}
[Fact]
public void UnionDeclaration_08()
{
var src = @"
#line 100
union S1(int, int)
{
}
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
// https://github.com/dotnet/roslyn/issues/82636: Consider reporting a more informative error.
comp.VerifyEmitDiagnostics(
// (100,15): error CS0111: Type 'S1' already defines a member called 'S1' with the same parameter types
// union S1(int, int)
Diagnostic(ErrorCode.ERR_MemberAlreadyExists, "int").WithArguments("S1", "S1").WithLocation(100, 15)
);
}
[Fact]
public void UnionDeclaration_09()
{
var src = @"
#line 100
union S1(int, __arglist)
{
}
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
comp.VerifyEmitDiagnostics(
// (100,15): error CS1669: __arglist is not valid in this context
// union S1(int, __arglist)
Diagnostic(ErrorCode.ERR_IllegalVarArgs, "__arglist").WithLocation(100, 15)
);
}
[Fact]
public void UnionDeclaration_10()
{
var src = @"
#line 100
union S1;
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
comp.VerifyEmitDiagnostics(
// (100,7): error CS9370: A union declaration must specify at least one case type.
// union S1;
Diagnostic(ErrorCode.ERR_UnionDeclarationNeedsCaseTypes, "S1").WithLocation(100, 7)
);
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
VerifyCaseTypes(comp, "S1", []);
}
[Fact]
public void UnionDeclaration_11()
{
var src = @"
#line 100
union S1();
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
// https://github.com/dotnet/roslyn/issues/82636: Consider repoting a more informative error. Perhaps something like: "A union declaration must specify at least one case type."
comp.VerifyEmitDiagnostics(
// (100,10): error CS1031: Type expected
// union S1();
Diagnostic(ErrorCode.ERR_TypeExpected, ")").WithLocation(100, 10)
);
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
VerifyCaseTypes(comp, "S1", ["?"]);
}
[Fact]
public void UnionDeclaration_12_MissingUnionAttribute()
{
var unionSrc = @"
#line 2
union S1(int, bool)
{
}
";
var comp = CreateCompilation([unionSrc, IUnionSource]);
comp.VerifyEmitDiagnostics(
// (2,7): error CS0656: Missing compiler required member 'System.Runtime.CompilerServices.UnionAttribute..ctor'
// union S1(int, bool)
Diagnostic(ErrorCode.ERR_MissingPredefinedMember, "S1").WithArguments("System.Runtime.CompilerServices.UnionAttribute", ".ctor").WithLocation(2, 7)
);
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
VerifyCaseTypes(comp, "S1", ["System.Int32", "System.Boolean"]);
}
[Fact]
public void UnionDeclaration_13()
{
var src = @"
union S1(
#nullable enable
string?
#nullable restore
);
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
VerifyCaseTypes(comp, "S1", ["System.String"]);
CompileAndVerify(comp, symbolValidator: verify, sourceSymbolValidator: verify).VerifyDiagnostics();
void verify(ModuleSymbol m)
{
var s1 = m.GlobalNamespace.GetTypeMember("S1");
AssertEx.Equal("S1..ctor(System.String? value)", s1.InstanceConstructors.Where(c => c.ParameterCount == 1).Single().ToTestDisplayString());
}
}
[Fact]
public void UnionDeclaration_14()
{
var src = @"
union S1<T>(T);
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
Assert.True(comp.GetTypeByMetadataName("S1`1").IsUnionType);
VerifyCaseTypes(comp, "S1`1", ["T"]);
comp.VerifyEmitDiagnostics();
}
[Fact]
public void UnionDeclaration_15()
{
var src = @"
#line 100
union S1(System.ArgIterator, int);
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource], targetFramework: TargetFramework.NetCoreApp);
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
VerifyCaseTypes(comp, "S1", ["System.ArgIterator", "System.Int32"]);
comp.VerifyEmitDiagnostics(
// (100,10): error CS9371: Cannot convert type 'ArgIterator' to 'object' via an implicit reference or boxing conversion
// union S1(System.ArgIterator, int);
Diagnostic(ErrorCode.ERR_NoImplicitConversionToObject, "System.ArgIterator").WithArguments("System.ArgIterator").WithLocation(100, 10)
);
}
[Fact]
public void UnionDeclaration_16()
{
var src = @"
#pragma warning disable CS1718 // Comparison made to same variable; did you mean to compare something else?
union S1(C1);
class C1
{
public override int GetHashCode() => 1;
public override bool Equals(object obj) => obj is C1;
}
class Program
{
static void Main()
{
var s11 = new S1(new C1());
var s12 = new S1(new C1());
var s13 = new S1();
System.Console.WriteLine(s11.ToString());
System.Console.WriteLine(s13.ToString());
System.Console.WriteLine(s11.Equals(s11));
System.Console.WriteLine(s11.Equals(s12));
System.Console.WriteLine(s11.Equals(s13));
System.Console.WriteLine(s13.Equals(s13));
}
}
";
var comp1 = CreateCompilation([src, UnionAttributeSource, IUnionSource], options: TestOptions.DebugExe);
CompileAndVerify(comp1, expectedOutput: @"
S1
S1
True
True
False
True
").VerifyDiagnostics();
}
[Fact]
public void UnionDeclaration_17()
{
var src = @"
union S1(C1)
{
public void OtherMember()
{
System.Console.Write(1);
}
}
class C1
{
}
class Program
{
static void Main()
{
default(S1).OtherMember();
}
}
";
var comp1 = CreateCompilation([src, UnionAttributeSource, IUnionSource], options: TestOptions.DebugExe);
CompileAndVerify(comp1, expectedOutput: "1").VerifyDiagnostics();
}
[Fact]
public void UnionDeclaration_18()
{
var src = @"
#line 100
union S1(System.Nullable<string>);
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource], targetFramework: TargetFramework.NetCoreApp);
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
VerifyCaseTypes(comp, "S1", ["System.String"]);
comp.VerifyEmitDiagnostics(
// (100,10): error CS9371: Cannot convert type 'string?' to 'object' via an implicit reference or boxing conversion
// union S1(System.Nullable<string>);
Diagnostic(ErrorCode.ERR_NoImplicitConversionToObject, "System.Nullable<string>").WithArguments("string?").WithLocation(100, 10),
// (100,10): error CS0453: The type 'string' must be a non-nullable value type in order to use it as parameter 'T' in the generic type or method 'Nullable<T>'
// union S1(System.Nullable<string>);
Diagnostic(ErrorCode.ERR_ValConstraintNotSatisfied, "System.Nullable<string>").WithArguments("System.Nullable<T>", "T", "string").WithLocation(100, 10)
);
}
[Fact]
public void UnionDeclaration_19_MissingObject()
{
var src = @"
#line 100
union S1(int);
";
var comp = CreateCompilation([src, UnionAttributeSource, IUnionSource]);
comp.MakeTypeMissing(SpecialType.System_Object);
comp.VerifyEmitDiagnostics(
// (100,7): error CS0518: Predefined type 'System.Object' is not defined or imported
// union S1(int);
Diagnostic(ErrorCode.ERR_PredefinedTypeNotFound, "S1").WithArguments("System.Object").WithLocation(100, 7),
// (100,7): error CS0518: Predefined type 'System.Object' is not defined or imported
// union S1(int);
Diagnostic(ErrorCode.ERR_PredefinedTypeNotFound, "S1").WithArguments("System.Object").WithLocation(100, 7),
// (100000,9): error CS0518: Predefined type 'System.Object' is not defined or imported
// object? Value { get; }
Diagnostic(ErrorCode.ERR_PredefinedTypeNotFound, "object").WithArguments("System.Object").WithLocation(100000, 9)
);
}
[Fact]
public void UnionDeclaration_20()
{
var src = @"
#pragma warning disable CS1718 // Comparison made to same variable; did you mean to compare something else?
union S1(object);
class Program
{
static void Main()
{
var s11 = new S1(123);
System.Console.WriteLine(s11.Value);
}
}
";
var comp1 = CreateCompilation([src, UnionAttributeSource, IUnionSource], options: TestOptions.DebugExe);
CompileAndVerify(comp1, expectedOutput: @"123").VerifyDiagnostics();
}
[Fact]
public void UnionDeclaration_21()
{
var src = @"
#pragma warning disable CS1718 // Comparison made to same variable; did you mean to compare something else?
union S1(int?);
class Program
{
static void Main()
{
var s11 = new S1(123);
System.Console.WriteLine(s11.Value);
}
}
";
var comp1 = CreateCompilation([src, UnionAttributeSource, IUnionSource], options: TestOptions.DebugExe);
CompileAndVerify(comp1, expectedOutput: @"123").VerifyDiagnostics();
}
[Fact]
public void UnionDeclaration_22_IUnion_Missing()
{
var unionSrc = @"
#line 2
union S1(int, bool)
{
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource]);
comp.VerifyEmitDiagnostics(
// (2,7): error CS0518: Predefined type 'System.Runtime.CompilerServices.IUnion' is not defined or imported
// union S1(int, bool)
Diagnostic(ErrorCode.ERR_PredefinedTypeNotFound, "S1").WithArguments("System.Runtime.CompilerServices.IUnion").WithLocation(2, 7)
);
Assert.True(comp.GetTypeByMetadataName("S1").IsUnionType);
VerifyCaseTypes(comp, "S1", ["System.Int32", "System.Boolean"]);
}
[Fact]
public void UnionDeclaration_22_IUnion_InBaseInterfaces()
{
var unionSrc = @"
union S1(int, bool) : System.Runtime.CompilerServices.IUnion
{
}
class Program
{
static void Main()
{
System.Console.Write(Test(10));
System.Console.Write(Test(11));
System.Console.Write(Test(true));
System.Console.Write(Test(false));
System.Console.Write(Test(default));
}
static int Test(S1 u)
{
return ((System.Runtime.CompilerServices.IUnion)u).Value switch
{
10 => 1,
true => 2,
int => 3,
bool => 4,
_ => 5
};
}
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource, IUnionSource], options: TestOptions.DebugExe);
CompileAndVerify(comp, symbolValidator: checkInterfaces, sourceSymbolValidator: checkInterfaces, expectedOutput: "13245").VerifyDiagnostics();
void checkInterfaces(ModuleSymbol m)
{
var s1 = m.GlobalNamespace.GetTypeMember("S1");
Assert.Equal("System.Runtime.CompilerServices.IUnion", s1.InterfacesNoUseSiteDiagnostics().Single().ToTestDisplayString());
}
}
[Fact]
public void UnionDeclaration_23_IUnion()
{
var unionSrc = @"
union S1(int, bool)
{
}
class Program
{
static void Main()
{
System.Console.Write(Test(10));
System.Console.Write(Test(11));
System.Console.Write(Test(true));
System.Console.Write(Test(false));
System.Console.Write(Test(default));
}
static int Test(S1 u)
{
return ((System.Runtime.CompilerServices.IUnion)u).Value switch
{
10 => 1,
true => 2,
int => 3,
bool => 4,
_ => 5
};
}
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource, IUnionSource], options: TestOptions.DebugExe);
CompileAndVerify(comp, symbolValidator: checkInterfaces, sourceSymbolValidator: checkInterfaces, expectedOutput: "13245").VerifyDiagnostics();
void checkInterfaces(ModuleSymbol m)
{
var s1 = m.GlobalNamespace.GetTypeMember("S1");
Assert.Equal("System.Runtime.CompilerServices.IUnion", s1.InterfacesNoUseSiteDiagnostics().Single().ToTestDisplayString());
}
}
[Fact]
public void UnionDeclaration_24_IUnion_ValueNullabilityMismatch()
{
var unionSrc = @"
union S1(int, bool)
{
}
namespace System.Runtime.CompilerServices
{
public interface IUnion
{
#nullable enable
object Value { get; }
#nullable disable
}
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource]);
CompileAndVerify(comp).VerifyDiagnostics();
}
[Fact]
public void UnionDeclaration_25_IUnion_ValueMissing()
{
var unionSrc = @"
union S1(int, bool)
{
}
namespace System.Runtime.CompilerServices
{
public interface IUnion
{
}
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource]);
CompileAndVerify(comp).VerifyDiagnostics();
}
[Fact]
public void UnionDeclaration_26_IUnion_UnexpectedMember()
{
var unionSrc = @"
union S1(int, bool)
{
}
union S2(int, bool)
{
public void M() { }
}
union S3(int, bool)
{
void System.Runtime.CompilerServices.IUnion.M() { }
}
namespace System.Runtime.CompilerServices
{
public interface IUnion
{
void M();
}
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource]);
comp.VerifyDiagnostics(
// (2,7): error CS0535: 'S1' does not implement interface member 'IUnion.M()'
// union S1(int, bool)
Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, "S1").WithArguments("S1", "System.Runtime.CompilerServices.IUnion.M()").WithLocation(2, 7)
);
}
[Fact]
public void UnionDeclaration_27_IUnion()
{
var unionSrc = @"
union S1(int, bool) : I1
{
}
interface I1 : System.Runtime.CompilerServices.IUnion;
class Program
{
static void Main()
{
System.Console.Write(Test(10));
System.Console.Write(Test(11));
System.Console.Write(Test(true));
System.Console.Write(Test(false));
System.Console.Write(Test(default));
}
static int Test(S1 u)
{
return ((System.Runtime.CompilerServices.IUnion)u).Value switch
{
10 => 1,
true => 2,
int => 3,
bool => 4,
_ => 5
};
}
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource, IUnionSource], options: TestOptions.DebugExe);
CompileAndVerify(comp, symbolValidator: checkInterfaces, sourceSymbolValidator: checkInterfaces, expectedOutput: "13245").VerifyDiagnostics();
void checkInterfaces(ModuleSymbol m)
{
var s1 = m.GlobalNamespace.GetTypeMember("S1");
AssertEx.SequenceEqual(["I1", "System.Runtime.CompilerServices.IUnion"], s1.InterfacesNoUseSiteDiagnostics().ToTestDisplayStrings());
}
}
[Fact]
public void UnionDeclaration_28()
{
var unionSrc = @"
#pragma warning disable CS0169 // The field 'S1.F' is never used
union S1(int, bool)
{
int F1;
}
union S2(int, bool)
{
static int F2;
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource, IUnionSource]);
comp.VerifyDiagnostics(
// (5,9): error CS9373: Instance fields, auto-properties or field-like events are not permitted in a 'union' declaration.
// int F1;
Diagnostic(ErrorCode.ERR_InstanceFieldInUnion, "F1").WithLocation(5, 9)
);
}
[Fact]
public void UnionDeclaration_29()
{
var unionSrc = @"
union S1(int, bool)
{
int P1 { get => 1; set {}}
}
union S2(int, bool)
{
int P2 { get; }
}
union S3(int, bool)
{
int P3 { set {field = value;} }
}
union S4(int, bool)
{
int P4 { get; set;}
}
union S5(int, bool)
{
int P5 { get => field; set {field = value;}}
}
interface I1
{
int P0 { get; set; }
}
union S6(int, bool) : I1
{
int I1.P0 { get; set; }
}
union S7(int, bool)
{
static int P7 { get; set;}
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource, IUnionSource]);
comp.VerifyDiagnostics(
// (9,9): error CS9373: Instance fields, auto-properties or field-like events are not permitted in a 'union' declaration.
// int P2 { get; }
Diagnostic(ErrorCode.ERR_InstanceFieldInUnion, "P2").WithLocation(9, 9),
// (14,9): error CS9373: Instance fields, auto-properties or field-like events are not permitted in a 'union' declaration.
// int P3 { set {field = value;} }
Diagnostic(ErrorCode.ERR_InstanceFieldInUnion, "P3").WithLocation(14, 9),
// (19,9): error CS9373: Instance fields, auto-properties or field-like events are not permitted in a 'union' declaration.
// int P4 { get; set;}
Diagnostic(ErrorCode.ERR_InstanceFieldInUnion, "P4").WithLocation(19, 9),
// (24,9): error CS9373: Instance fields, auto-properties or field-like events are not permitted in a 'union' declaration.
// int P5 { get => field; set {field = value;}}
Diagnostic(ErrorCode.ERR_InstanceFieldInUnion, "P5").WithLocation(24, 9),
// (34,12): error CS9373: Instance fields, auto-properties or field-like events are not permitted in a 'union' declaration.
// int I1.P0 { get; set; }
Diagnostic(ErrorCode.ERR_InstanceFieldInUnion, "P0").WithLocation(34, 12)
);
}
[Fact]
public void UnionDeclaration_30()
{
var unionSrc = @"
#pragma warning disable CS0067 // The event 'S2.E2' is never used
union S1(int, bool)
{
event System.Action E1 { add{} remove{}}
}
union S2(int, bool)
{
event System.Action E2;
}
interface I1
{
event System.Action E0;
}
union S3(int, bool) : I1
{
event System.Action I1.E0;
}
union S4(int, bool)
{
static event System.Action E4;
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource, IUnionSource]);
comp.VerifyDiagnostics(
// (11,25): error CS9373: Instance fields, auto-properties or field-like events are not permitted in a 'union' declaration.
// event System.Action E2;
Diagnostic(ErrorCode.ERR_InstanceFieldInUnion, "E2").WithLocation(11, 25),
// (19,23): error CS0535: 'S3' does not implement interface member 'I1.E0.add'
// union S3(int, bool) : I1
Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, "I1").WithArguments("S3", "I1.E0.add").WithLocation(19, 23),
// (19,23): error CS0535: 'S3' does not implement interface member 'I1.E0.remove'
// union S3(int, bool) : I1
Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, "I1").WithArguments("S3", "I1.E0.remove").WithLocation(19, 23),
// (21,28): error CS0071: An explicit interface implementation of an event must use event accessor syntax
// event System.Action I1.E0;
Diagnostic(ErrorCode.ERR_ExplicitEventFieldImpl, "E0").WithLocation(21, 28)
);
}
[Fact]
public void UnionDeclaration_31()
{
var unionSrc = @"
union S1(int, bool)
{
S1(string x)
: this(1) {}
}
union S2(int, bool)
{
S2(ref string x)
: this(1) {}
}
union S3(int, bool)
{
S3(in string x)
: this(1) {}
}
union S4(int, bool)
{
S4(ref readonly string x)
: this(1) {}
}
union S5(int, bool)
{
S5(out string x)
: this(1) { x = """"; }
}
union S6(int, bool)
{
S6(int x, bool y)
: this(x) {}
}
union S7(int, bool)
{
public S7()
: this(1) {}
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource, IUnionSource]);
comp.VerifyDiagnostics(
// (4,5): error CS9374: Explicitly declared public constructors with a single parameter are not permitted in a 'union' declaration.
// S1(string x)
Diagnostic(ErrorCode.ERR_InstanceCtorWithOneParameterInUnion, "S1").WithLocation(4, 5),
// (10,5): error CS9374: Explicitly declared public constructors with a single parameter are not permitted in a 'union' declaration.
// S2(ref string x)
Diagnostic(ErrorCode.ERR_InstanceCtorWithOneParameterInUnion, "S2").WithLocation(10, 5),
// (16,5): error CS9374: Explicitly declared public constructors with a single parameter are not permitted in a 'union' declaration.
// S3(in string x)
Diagnostic(ErrorCode.ERR_InstanceCtorWithOneParameterInUnion, "S3").WithLocation(16, 5),
// (22,5): error CS9374: Explicitly declared public constructors with a single parameter are not permitted in a 'union' declaration.
// S4(ref readonly string x)
Diagnostic(ErrorCode.ERR_InstanceCtorWithOneParameterInUnion, "S4").WithLocation(22, 5),
// (28,5): error CS9374: Explicitly declared public constructors with a single parameter are not permitted in a 'union' declaration.
// S5(out string x)
Diagnostic(ErrorCode.ERR_InstanceCtorWithOneParameterInUnion, "S5").WithLocation(28, 5)
);
}
[Fact]
public void UnionDeclaration_32()
{
var unionSrc = @"
union S6(int, bool)
{
#line 4
S6(int x, bool y)
{}
}
union S7(int, bool)
{
#line 10
public S7()
{}
}
union S8(int, bool)
{
#line 16
S8(int x, bool y)
{}
S8(string x, bool y)
: this(1)
{}
}
union S9(int, bool)
{
S9(int x, bool y)
: this()
{}
#line 30
public S9()
{}
}
union S10(int, bool)
{
#line 36
S10(int x, bool y)
{}
public S10()
: this(1)
{}
}
union S11(int, bool)
{
static S11()
{}
}
union S12(int, bool)
{
S12(int x, bool y)
#line 53
: this()
{}
}
union S13(int, bool)
{
S13(int x, bool y)
: this("""", y)
{}
S13(string x, bool y)
: this(y)
{}
}
";
var comp = CreateCompilation([unionSrc, UnionAttributeSource, IUnionSource]);
comp.VerifyDiagnostics(
// (4,5): error CS9375: A constructor declared in a 'union' declaration must have a 'this' initializer that calls a synthesized constructor or an explicitly declared constructor.
// S6(int x, bool y)
Diagnostic(ErrorCode.ERR_UnionConstructorCallsDefaultConstructor, "S6").WithLocation(4, 5),
// (10,12): error CS9375: A constructor declared in a 'union' declaration must have a 'this' initializer that calls a synthesized constructor or an explicitly declared constructor.
// public S7()
Diagnostic(ErrorCode.ERR_UnionConstructorCallsDefaultConstructor, "S7").WithLocation(10, 12),
// (16,5): error CS9375: A constructor declared in a 'union' declaration must have a 'this' initializer that calls a synthesized constructor or an explicitly declared constructor.
// S8(int x, bool y)
Diagnostic(ErrorCode.ERR_UnionConstructorCallsDefaultConstructor, "S8").WithLocation(16, 5),
// (30,12): error CS9375: A constructor declared in a 'union' declaration must have a 'this' initializer that calls a synthesized constructor or an explicitly declared constructor.
// public S9()
Diagnostic(ErrorCode.ERR_UnionConstructorCallsDefaultConstructor, "S9").WithLocation(30, 12),
// (36,5): error CS9375: A constructor declared in a 'union' declaration must have a 'this' initializer that calls a synthesized constructor or an explicitly declared constructor.
// S10(int x, bool y)
Diagnostic(ErrorCode.ERR_UnionConstructorCallsDefaultConstructor, "S10").WithLocation(36, 5),
// (53,7): error CS9375: A constructor declared in a 'union' declaration must have a 'this' initializer that calls a synthesized constructor or an explicitly declared constructor.
// : this()
Diagnostic(ErrorCode.ERR_UnionConstructorCallsDefaultConstructor, "this").WithLocation(53, 7)
);
}
}
}
// https://github.com/dotnet/roslyn/issues/82636: Test conversions from 'new()' and other target-typed constructs
// https://github.com/dotnet/roslyn/issues/82636: Ensure we test nullable state resulting from a struct union type nullary (no-argument) constructor invocation.
|