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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.Symbols.Metadata.PE;
using Microsoft.CodeAnalysis.CSharp.Symbols.Retargeting;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
using Microsoft.CodeAnalysis.Emit;
using Microsoft.CodeAnalysis.Test.Utilities;
using Roslyn.Test.Utilities;
using Xunit;
namespace Microsoft.CodeAnalysis.CSharp.UnitTests.Semantics
{
[CompilerTrait(CompilerFeature.InitOnlySetters)]
public class InitOnlyMemberTests : CompilingTestBase
{
// Spec: https://github.com/dotnet/csharplang/blob/main/proposals/init.md
// https://github.com/dotnet/roslyn/issues/44685
// test dynamic scenario
// test whether reflection use property despite modreq?
// test behavior of old compiler with modreq. For example VB
[Fact]
public void TestCSharp8()
{
string source = @"
public class C
{
public string Property { get; init; }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular8);
comp.VerifyEmitDiagnostics(
// (4,35): error CS8400: Feature 'init-only setters' is not available in C# 8.0. Please use language version 9.0 or greater.
// public string Property { get; init; }
Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion8, "init").WithArguments("init-only setters", "9.0").WithLocation(4, 35)
);
var property = (PropertySymbol)comp.GlobalNamespace.GetMember("C.Property");
Assert.False(property.GetMethod.IsInitOnly);
Assert.True(property.SetMethod.IsInitOnly);
IPropertySymbol publicProperty = property.GetPublicSymbol();
Assert.False(publicProperty.GetMethod.IsInitOnly);
Assert.True(publicProperty.SetMethod.IsInitOnly);
}
[Theory, CombinatorialData, WorkItem(50245, "https://github.com/dotnet/roslyn/issues/50245")]
public void TestCSharp8_ConsumptionInObjectInitializer(bool useMetadataImage)
{
string lib_cs = @"
public class C
{
public string Property { get; init; }
public string Property2 { get; }
}
";
var lib = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
string source = @"
public class D
{
void M()
{
_ = new C() { Property = string.Empty, Property2 = string.Empty };
}
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular8,
references: new[] { useMetadataImage ? lib.EmitToImageReference() : lib.ToMetadataReference() });
comp.VerifyEmitDiagnostics(
// (6,23): error CS8400: Feature 'init-only setters' is not available in C# 8.0. Please use language version 9.0 or greater.
// _ = new C() { Property = string.Empty, Property2 = string.Empty };
Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion8, "Property").WithArguments("init-only setters", "9.0").WithLocation(6, 23),
// (6,48): error CS0200: Property or indexer 'C.Property2' cannot be assigned to -- it is read only
// _ = new C() { Property = string.Empty, Property2 = string.Empty };
Diagnostic(ErrorCode.ERR_AssgReadonlyProp, "Property2").WithArguments("C.Property2").WithLocation(6, 48)
);
}
[Theory, CombinatorialData, WorkItem(50245, "https://github.com/dotnet/roslyn/issues/50245")]
public void TestCSharp8_ConsumptionInNestedObjectInitializer(bool useMetadataImage)
{
string lib_cs = @"
public class C
{
public string Property { get; init; }
public string Property2 { get; }
}
public class Container
{
public C contained;
}
";
var lib = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
string source = @"
public class D
{
void M(C c)
{
_ = new Container() { contained = { Property = string.Empty, Property2 = string.Empty } };
}
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular8,
references: new[] { useMetadataImage ? lib.EmitToImageReference() : lib.ToMetadataReference() });
comp.VerifyEmitDiagnostics(
// (6,45): error CS8852: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// _ = new Container() { contained = { Property = string.Empty, Property2 = string.Empty } };
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(6, 45),
// (6,70): error CS0200: Property or indexer 'C.Property2' cannot be assigned to -- it is read only
// _ = new Container() { contained = { Property = string.Empty, Property2 = string.Empty } };
Diagnostic(ErrorCode.ERR_AssgReadonlyProp, "Property2").WithArguments("C.Property2").WithLocation(6, 70)
);
}
[Theory, CombinatorialData, WorkItem(50245, "https://github.com/dotnet/roslyn/issues/50245")]
public void TestCSharp8_ConsumptionInWithExpression(bool useMetadataImage)
{
string lib_cs = @"
public record C
{
public string Property { get; init; }
public string Property2 { get; }
}
";
var lib = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
string source = @"
public class D
{
void M(C c)
{
_ = c with { Property = string.Empty, Property2 = string.Empty };
}
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular8,
references: new[] { useMetadataImage ? lib.EmitToImageReference() : lib.ToMetadataReference() });
comp.VerifyEmitDiagnostics(
// (6,15): error CS8400: Feature 'records' is not available in C# 8.0. Please use language version 9.0 or greater.
// _ = c with { Property = string.Empty, Property2 = string.Empty };
Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion8, "with").WithArguments("records", "9.0").WithLocation(6, 15),
// (6,22): error CS8400: Feature 'init-only setters' is not available in C# 8.0. Please use language version 9.0 or greater.
// _ = c with { Property = string.Empty, Property2 = string.Empty };
Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion8, "Property").WithArguments("init-only setters", "9.0").WithLocation(6, 22),
// (6,47): error CS0200: Property or indexer 'C.Property2' cannot be assigned to -- it is read only
// _ = c with { Property = string.Empty, Property2 = string.Empty };
Diagnostic(ErrorCode.ERR_AssgReadonlyProp, "Property2").WithArguments("C.Property2").WithLocation(6, 47)
);
}
[Theory, CombinatorialData, WorkItem(50245, "https://github.com/dotnet/roslyn/issues/50245")]
public void TestCSharp8_ConsumptionInAssignment(bool useMetadataImage)
{
string lib_cs = @"
public record C
{
public string Property { get; init; }
public string Property2 { get; }
}
";
var lib = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
string source = @"
public class D
{
void M(C c)
{
c.Property = string.Empty;
c.Property2 = string.Empty;
}
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular8,
references: new[] { useMetadataImage ? lib.EmitToImageReference() : lib.ToMetadataReference() });
comp.VerifyEmitDiagnostics(
// (6,9): error CS8852: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = string.Empty;
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(6, 9),
// (7,9): error CS0200: Property or indexer 'C.Property2' cannot be assigned to -- it is read only
// c.Property2 = string.Empty;
Diagnostic(ErrorCode.ERR_AssgReadonlyProp, "c.Property2").WithArguments("C.Property2").WithLocation(7, 9)
);
}
[Theory, CombinatorialData, WorkItem(50245, "https://github.com/dotnet/roslyn/issues/50245")]
public void TestCSharp8_ConsumptionInAttribute(bool useMetadataImage)
{
string lib_cs = @"
public class TestAttribute : System.Attribute
{
public int Property { get; init; }
public int Property2 { get; }
}
";
var lib = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
string source = @"
[Test(Property = 42, Property2 = 43)]
class C
{
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular8,
references: new[] { useMetadataImage ? lib.EmitToImageReference() : lib.ToMetadataReference() });
comp.VerifyEmitDiagnostics(
// (2,7): error CS8400: Feature 'init-only setters' is not available in C# 8.0. Please use language version 9.0 or greater.
// [Test(Property = 42, Property2 = 43)]
Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion8, "Property = 42").WithArguments("init-only setters", "9.0").WithLocation(2, 7),
// (2,22): error CS0617: 'Property2' is not a valid named attribute argument. Named attribute arguments must be fields which are not readonly, static, or const, or read-write properties which are public and not static.
// [Test(Property = 42, Property2 = 43)]
Diagnostic(ErrorCode.ERR_BadNamedAttributeArgument, "Property2").WithArguments("Property2").WithLocation(2, 22)
);
comp = CreateCompilation(source, parseOptions: TestOptions.Regular9,
references: new[] { useMetadataImage ? lib.EmitToImageReference() : lib.ToMetadataReference() });
comp.VerifyEmitDiagnostics(
// (2,22): error CS0617: 'Property2' is not a valid named attribute argument. Named attribute arguments must be fields which are not readonly, static, or const, or read-write properties which are public and not static.
// [Test(Property = 42, Property2 = 43)]
Diagnostic(ErrorCode.ERR_BadNamedAttributeArgument, "Property2").WithArguments("Property2").WithLocation(2, 22)
);
}
[Fact, WorkItem(50245, "https://github.com/dotnet/roslyn/issues/50245")]
public void TestCSharp8_ConsumptionWithinSameCompilation()
{
string source = @"
class C
{
string Property { get; init; }
string Property2 { get; }
void M(C c)
{
_ = new C() { Property = string.Empty, Property2 = string.Empty };
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular8);
comp.VerifyEmitDiagnostics(
// (4,28): error CS8400: Feature 'init-only setters' is not available in C# 8.0. Please use language version 9.0 or greater.
// string Property { get; init; }
Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion8, "init").WithArguments("init-only setters", "9.0").WithLocation(4, 28),
// (9,48): error CS0200: Property or indexer 'C.Property2' cannot be assigned to -- it is read only
// _ = new C() { Property = string.Empty, Property2 = string.Empty };
Diagnostic(ErrorCode.ERR_AssgReadonlyProp, "Property2").WithArguments("C.Property2").WithLocation(9, 48)
);
}
[Fact, WorkItem(50245, "https://github.com/dotnet/roslyn/issues/50245")]
public void TestCSharp8_ConsumptionWithinSameCompilation_InAttribute()
{
string source = @"
public class TestAttribute : System.Attribute
{
public int Property { get; init; }
public int Property2 { get; }
}
[Test(Property = 42, Property2 = 43)]
class C
{
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular8);
comp.VerifyEmitDiagnostics(
// (4,32): error CS8400: Feature 'init-only setters' is not available in C# 8.0. Please use language version 9.0 or greater.
// public int Property { get; init; }
Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion8, "init").WithArguments("init-only setters", "9.0").WithLocation(4, 32),
// (8,22): error CS0617: 'Property2' is not a valid named attribute argument. Named attribute arguments must be fields which are not readonly, static, or const, or read-write properties which are public and not static.
// [Test(Property = 42, Property2 = 43)]
Diagnostic(ErrorCode.ERR_BadNamedAttributeArgument, "Property2").WithArguments("Property2").WithLocation(8, 22)
);
}
[Fact, WorkItem(50245, "https://github.com/dotnet/roslyn/issues/50245")]
public void TestCSharp8_ConsumptionFromCompilationReference()
{
string lib_cs = @"
public class C
{
public string Property { get; init; }
public string Property2 { get; }
}
";
var lib = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular8, assemblyName: "lib");
string source = @"
public class D
{
void M()
{
_ = new C() { Property = string.Empty, Property2 = string.Empty };
}
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular8, references: new[] { lib.ToMetadataReference() }, assemblyName: "comp");
comp.VerifyEmitDiagnostics(
// (6,23): error CS8400: Feature 'init-only setters' is not available in C# 8.0. Please use language version 9.0 or greater.
// _ = new C() { Property = string.Empty, Property2 = string.Empty };
Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion8, "Property").WithArguments("init-only setters", "9.0").WithLocation(6, 23),
// (6,48): error CS0200: Property or indexer 'C.Property2' cannot be assigned to -- it is read only
// _ = new C() { Property = string.Empty, Property2 = string.Empty };
Diagnostic(ErrorCode.ERR_AssgReadonlyProp, "Property2").WithArguments("C.Property2").WithLocation(6, 48)
);
}
[Theory, CombinatorialData, WorkItem(50245, "https://github.com/dotnet/roslyn/issues/50245")]
public void TestCSharp8_ConsumptionWithDynamicArgument(bool useMetadataImage)
{
string lib_cs = @"
public class C
{
public string Property { get; init; }
public string Property2 { get; }
public C(int i) { }
}
";
var lib = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
string source = @"
public class D
{
void M(dynamic d)
{
_ = new C(d) { Property = string.Empty, Property2 = string.Empty };
}
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular8,
references: new[] { useMetadataImage ? lib.EmitToImageReference() : lib.ToMetadataReference() });
comp.VerifyEmitDiagnostics(
// (6,24): error CS8400: Feature 'init-only setters' is not available in C# 8.0. Please use language version 9.0 or greater.
// _ = new C(d) { Property = string.Empty, Property2 = string.Empty };
Diagnostic(ErrorCode.ERR_FeatureNotAvailableInVersion8, "Property").WithArguments("init-only setters", "9.0").WithLocation(6, 24),
// (6,49): error CS0200: Property or indexer 'C.Property2' cannot be assigned to -- it is read only
// _ = new C(d) { Property = string.Empty, Property2 = string.Empty };
Diagnostic(ErrorCode.ERR_AssgReadonlyProp, "Property2").WithArguments("C.Property2").WithLocation(6, 49)
);
}
[Fact]
public void TestInitNotModifier()
{
string source = @"
public class C
{
public string Property { get; init set; }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,40): error CS8180: { or ; or => expected
// public string Property { get; init set; }
Diagnostic(ErrorCode.ERR_SemiOrLBraceOrArrowExpected, "set").WithLocation(4, 40),
// (4,40): error CS1007: Property accessor already defined
// public string Property { get; init set; }
Diagnostic(ErrorCode.ERR_DuplicateAccessor, "set").WithLocation(4, 40)
);
}
[Fact]
public void TestWithDuplicateAccessor()
{
string source = @"
public class C
{
public string Property { set => throw null; init => throw null; }
public string Property2 { init => throw null; set => throw null; }
public string Property3 { init => throw null; init => throw null; }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,49): error CS1007: Property accessor already defined
// public string Property { set => throw null; init => throw null; }
Diagnostic(ErrorCode.ERR_DuplicateAccessor, "init").WithLocation(4, 49),
// (5,51): error CS1007: Property accessor already defined
// public string Property2 { init => throw null; set => throw null; }
Diagnostic(ErrorCode.ERR_DuplicateAccessor, "set").WithLocation(5, 51),
// (6,51): error CS1007: Property accessor already defined
// public string Property3 { init => throw null; init => throw null; }
Diagnostic(ErrorCode.ERR_DuplicateAccessor, "init").WithLocation(6, 51)
);
var members = ((NamedTypeSymbol)comp.GlobalNamespace.GetMember("C")).GetMembers();
AssertEx.SetEqual(members.ToTestDisplayStrings(),
new[] {
"System.String C.Property { set; }",
"void C.Property.set",
"System.String C.Property2 { init; }",
"void modreq(System.Runtime.CompilerServices.IsExternalInit) C.Property2.init",
"System.String C.Property3 { init; }",
"void modreq(System.Runtime.CompilerServices.IsExternalInit) C.Property3.init",
"C..ctor()"
});
var property = (PropertySymbol)comp.GlobalNamespace.GetMember("C.Property");
Assert.False(property.SetMethod.IsInitOnly);
Assert.False(property.GetPublicSymbol().SetMethod.IsInitOnly);
var property2 = (PropertySymbol)comp.GlobalNamespace.GetMember("C.Property2");
Assert.True(property2.SetMethod.IsInitOnly);
Assert.True(property2.GetPublicSymbol().SetMethod.IsInitOnly);
var property3 = (PropertySymbol)comp.GlobalNamespace.GetMember("C.Property3");
Assert.True(property3.SetMethod.IsInitOnly);
Assert.True(property3.GetPublicSymbol().SetMethod.IsInitOnly);
}
[Fact]
public void InThisOrBaseConstructorInitializer()
{
string source = @"
public class C
{
public string Property { init { throw null; } }
public C() : this(Property = null) // 1
{
}
public C(string s)
{
}
}
public class Derived : C
{
public Derived() : base(Property = null) // 2
{
}
public Derived(int i) : base(base.Property = null) // 3
{
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (5,23): error CS0120: An object reference is required for the non-static field, method, or property 'C.Property'
// public C() : this(Property = null) // 1
Diagnostic(ErrorCode.ERR_ObjectRequired, "Property").WithArguments("C.Property").WithLocation(5, 23),
// (15,29): error CS0120: An object reference is required for the non-static field, method, or property 'C.Property'
// public Derived() : base(Property = null) // 2
Diagnostic(ErrorCode.ERR_ObjectRequired, "Property").WithArguments("C.Property").WithLocation(15, 29),
// (19,34): error CS1512: Keyword 'base' is not available in the current context
// public Derived(int i) : base(base.Property = null) // 3
Diagnostic(ErrorCode.ERR_BaseInBadContext, "base").WithLocation(19, 34)
);
}
[Fact]
public void TestWithAccessModifiers_Private()
{
string source = @"
public class C
{
public string Property { get { throw null; } private init { throw null; } }
void M()
{
_ = new C() { Property = null };
Property = null; // 1
}
C()
{
Property = null;
}
}
public class Other
{
void M(C c)
{
_ = new C() { Property = null }; // 2, 3
c.Property = null; // 4
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(8, 9),
// (20,17): error CS0122: 'C.C()' is inaccessible due to its protection level
// _ = new C() { Property = null }; // 2, 3
Diagnostic(ErrorCode.ERR_BadAccess, "C").WithArguments("C.C()").WithLocation(20, 17),
// (20,23): error CS0272: The property or indexer 'C.Property' cannot be used in this context because the set accessor is inaccessible
// _ = new C() { Property = null }; // 2, 3
Diagnostic(ErrorCode.ERR_InaccessibleSetter, "Property").WithArguments("C.Property").WithLocation(20, 23),
// (21,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 4
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(21, 9)
);
}
[Fact]
public void TestWithAccessModifiers_Protected()
{
string source = @"
public class C
{
public string Property { get { throw null; } protected init { throw null; } }
void M()
{
_ = new C() { Property = null };
Property = null; // 1
}
public C()
{
Property = null;
}
}
public class Derived : C
{
void M(C c)
{
_ = new C() { Property = null }; // 2
c.Property = null; // 3, 4
Property = null; // 5
}
Derived()
{
_ = new C() { Property = null }; // 6
_ = new Derived() { Property = null };
Property = null;
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(8, 9),
// (20,23): error CS1540: Cannot access protected member 'C.Property' via a qualifier of type 'C'; the qualifier must be of type 'Derived' (or derived from it)
// _ = new C() { Property = null }; // 2
Diagnostic(ErrorCode.ERR_BadProtectedAccess, "Property").WithArguments("C.Property", "C", "Derived").WithLocation(20, 23),
// (21,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 3, 4
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(21, 9),
// (22,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 5
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(22, 9),
// (27,23): error CS1540: Cannot access protected member 'C.Property' via a qualifier of type 'C'; the qualifier must be of type 'Derived' (or derived from it)
// _ = new C() { Property = null }; // 6
Diagnostic(ErrorCode.ERR_BadProtectedAccess, "Property").WithArguments("C.Property", "C", "Derived").WithLocation(27, 23)
);
}
[Fact]
public void TestWithAccessModifiers_Protected_WithoutGetter()
{
string source = @"
public class C
{
public string Property { protected init { throw null; } }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,19): error CS0276: 'C.Property': accessibility modifiers on accessors may only be used if the property or indexer has both a get and a set accessor
// public string Property { protected init { throw null; } }
Diagnostic(ErrorCode.ERR_AccessModMissingAccessor, "Property").WithArguments("C.Property").WithLocation(4, 19)
);
}
[Fact]
public void OverrideScenarioWithSubstitutions()
{
string source = @"
public class C<T>
{
public string Property { get; init; }
}
public class Derived : C<string>
{
void M()
{
Property = null; // 1
}
Derived()
{
Property = null;
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (10,9): error CS8802: Init-only property or indexer 'C<string>.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C<string>.Property").WithLocation(10, 9)
);
var property = (PropertySymbol)comp.GlobalNamespace.GetTypeMember("Derived").BaseTypeNoUseSiteDiagnostics.GetMember("Property");
Assert.False(property.GetMethod.IsInitOnly);
Assert.False(property.GetPublicSymbol().GetMethod.IsInitOnly);
Assert.True(property.SetMethod.IsInitOnly);
Assert.True(property.GetPublicSymbol().SetMethod.IsInitOnly);
}
[Fact]
public void ImplementationScenarioWithSubstitutions()
{
string source = @"
public interface I<T>
{
public string Property { get; init; }
}
public class CWithInit : I<string>
{
public string Property { get; init; }
}
public class CWithoutInit : I<string> // 1
{
public string Property { get; set; }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (10,29): error CS8804: 'CWithoutInit' does not implement interface member 'I<string>.Property.init'. 'CWithoutInit.Property.set' cannot implement 'I<string>.Property.init'.
// public class CWithoutInit : I<string> // 1
Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongInitOnly, "I<string>").WithArguments("CWithoutInit", "I<string>.Property.init", "CWithoutInit.Property.set").WithLocation(10, 29)
);
var property = (PropertySymbol)comp.GlobalNamespace.GetMember("I.Property");
Assert.False(property.GetMethod.IsInitOnly);
Assert.False(property.GetPublicSymbol().GetMethod.IsInitOnly);
Assert.True(property.SetMethod.IsInitOnly);
Assert.True(property.GetPublicSymbol().SetMethod.IsInitOnly);
}
[Fact]
public void InLambdaOrLocalFunction_InMethodOrDerivedConstructor()
{
string source = @"
public class C<T>
{
public string Property { get; init; }
}
public class Derived : C<string>
{
void M()
{
System.Action a = () =>
{
Property = null; // 1
};
local();
void local()
{
Property = null; // 2
}
}
Derived()
{
System.Action a = () =>
{
Property = null; // 3
};
local();
void local()
{
Property = null; // 4
}
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (12,13): error CS8802: Init-only property or indexer 'C<string>.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C<string>.Property").WithLocation(12, 13),
// (18,13): error CS8802: Init-only property or indexer 'C<string>.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 2
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C<string>.Property").WithLocation(18, 13),
// (26,13): error CS8802: Init-only property or indexer 'C<string>.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 3
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C<string>.Property").WithLocation(26, 13),
// (32,13): error CS8802: Init-only property or indexer 'C<string>.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 4
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C<string>.Property").WithLocation(32, 13)
);
}
[Fact]
public void InLambdaOrLocalFunction_InConstructorOrInit()
{
string source = @"
public class C<T>
{
public string Property { get; init; }
C()
{
System.Action a = () =>
{
Property = null; // 1
};
local();
void local()
{
Property = null; // 2
}
}
public string Other
{
init
{
System.Action a = () =>
{
Property = null; // 3
};
local();
void local()
{
Property = null; // 4
}
}
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (10,13): error CS8802: Init-only property or indexer 'C<T>.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C<T>.Property").WithLocation(10, 13),
// (16,13): error CS8802: Init-only property or indexer 'C<T>.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 2
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C<T>.Property").WithLocation(16, 13),
// (26,17): error CS8802: Init-only property or indexer 'C<T>.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 3
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C<T>.Property").WithLocation(26, 17),
// (32,17): error CS8802: Init-only property or indexer 'C<T>.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 4
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C<T>.Property").WithLocation(32, 17)
);
}
[Fact]
public void MissingIsInitOnlyType_Property()
{
string source = @"
public class C
{
public string Property { get => throw null; init { } }
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,49): error CS0518: Predefined type 'System.Runtime.CompilerServices.IsExternalInit' is not defined or imported
// public string Property { get => throw null; init { } }
Diagnostic(ErrorCode.ERR_PredefinedTypeNotFound, "init").WithArguments("System.Runtime.CompilerServices.IsExternalInit").WithLocation(4, 49)
);
}
[Fact]
public void InitOnlyPropertyAssignmentDisallowed()
{
string source = @"
public class C
{
public string Property { get; init; }
void M()
{
Property = null; // 1
_ = new C() { Property = null };
}
public C()
{
Property = null;
}
public string InitOnlyProperty
{
get
{
Property = null; // 2
return null;
}
init
{
Property = null;
}
}
public string RegularProperty
{
get
{
Property = null; // 3
return null;
}
set
{
Property = null; // 4
}
}
public string otherField = (Property = null); // 5
}
class Derived : C
{
}
class Derived2 : Derived
{
void M()
{
Property = null; // 6
}
Derived2()
{
Property = null;
}
public string InitOnlyProperty2
{
get
{
Property = null; // 7
return null;
}
init
{
Property = null;
}
}
public string RegularProperty2
{
get
{
Property = null; // 8
return null;
}
set
{
Property = null; // 9
}
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(8, 9),
// (21,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 2
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(21, 13),
// (34,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 3
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(34, 13),
// (39,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 4
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(39, 13),
// (43,33): error CS0236: A field initializer cannot reference the non-static field, method, or property 'C.Property'
// public string otherField = (Property = null); // 5
Diagnostic(ErrorCode.ERR_FieldInitRefNonstatic, "Property").WithArguments("C.Property").WithLocation(43, 33),
// (54,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 6
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(54, 9),
// (66,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 7
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(66, 13),
// (79,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 8
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(79, 13),
// (84,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 9
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(84, 13)
);
var property = (PropertySymbol)comp.GlobalNamespace.GetMember("C.Property");
Assert.False(property.GetMethod.IsInitOnly);
Assert.False(property.GetPublicSymbol().GetMethod.IsInitOnly);
Assert.True(property.SetMethod.IsInitOnly);
Assert.True(property.GetPublicSymbol().SetMethod.IsInitOnly);
}
[Fact]
public void InitOnlyPropertyAssignmentAllowedInWithInitializer()
{
string source = @"
record C
{
public int Property { get; init; }
void M(C c)
{
_ = c with { Property = 1 };
}
}
record Derived : C
{
}
record Derived2 : Derived
{
void M(C c)
{
_ = c with { Property = 1 };
_ = this with { Property = 1 };
}
}
class Other
{
void M()
{
var c = new C() with { Property = 42 };
System.Console.Write($""{c.Property}"");
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics();
}
[Fact(Skip = "https://github.com/dotnet/roslyn/issues/44859")]
[WorkItem(44859, "https://github.com/dotnet/roslyn/issues/44859")]
public void InitOnlyPropertyAssignmentAllowedInWithInitializer_Evaluation()
{
string source = @"
record C
{
private int field;
public int Property { get { return field; } init { field = value; System.Console.Write(""set ""); } }
public C Clone() { System.Console.Write(""clone ""); return this; }
}
class Other
{
public static void Main()
{
var c = new C() with { Property = 42 };
System.Console.Write($""{c.Property}"");
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9, options: TestOptions.DebugExe);
comp.VerifyDiagnostics();
CompileAndVerify(comp, expectedOutput: "clone set 42");
}
[Fact]
public void EvaluationInitOnlySetter()
{
string source = @"
public class C
{
public int Property
{
init { System.Console.Write(value + "" ""); }
}
public int Property2
{
init { System.Console.Write(value); }
}
C()
{
System.Console.Write(""Main "");
}
static void Main()
{
_ = new C() { Property = 42, Property2 = 43};
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9, options: TestOptions.DebugExe);
comp.VerifyDiagnostics();
CompileAndVerify(comp, expectedOutput: "Main 42 43");
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public void EvaluationInitOnlySetter_OverrideAutoProp(bool emitImage)
{
string parent = @"
public class Base
{
public virtual int Property { get; init; }
}";
string source = @"
public class C : Base
{
int field;
public override int Property
{
get { System.Console.Write(""get:"" + field + "" ""); return field; }
init { field = value; System.Console.Write(""set:"" + value + "" ""); }
}
public C()
{
System.Console.Write(""Main "");
}
}";
string main = @"
public class D
{
static void Main()
{
var c = new C() { Property = 42 };
_ = c.Property;
}
}
";
var libComp = CreateCompilation(new[] { parent, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
var comp = CreateCompilation(new[] { source, main }, references: new[] { emitImage ? libComp.EmitToImageReference() : libComp.ToMetadataReference() },
parseOptions: TestOptions.Regular9, options: TestOptions.DebugExe);
CompileAndVerify(comp, expectedOutput: "Main set:42 get:42");
libComp = CreateCompilation(new[] { parent, source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp = CreateCompilation(new[] { main }, references: new[] { emitImage ? libComp.EmitToImageReference() : libComp.ToMetadataReference() },
parseOptions: TestOptions.Regular9, options: TestOptions.DebugExe);
CompileAndVerify(comp, expectedOutput: "Main set:42 get:42");
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public void EvaluationInitOnlySetter_AutoProp(bool emitImage)
{
string source = @"
public class C
{
public int Property { get; init; }
public C()
{
System.Console.Write(""Main "");
}
}";
string main = @"
public class D
{
static void Main()
{
var c = new C() { Property = 42 };
System.Console.Write($""{c.Property}"");
}
}
";
var libComp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
var comp = CreateCompilation(new[] { main }, references: new[] { emitImage ? libComp.EmitToImageReference() : libComp.ToMetadataReference() },
parseOptions: TestOptions.Regular9, options: TestOptions.DebugExe);
CompileAndVerify(comp, expectedOutput: "Main 42");
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public void EvaluationInitOnlySetter_Implementation(bool emitImage)
{
string parent = @"
public interface I
{
int Property { get; init; }
}";
string source = @"
public class C : I
{
int field;
public int Property
{
get { System.Console.Write(""get:"" + field + "" ""); return field; }
init { field = value; System.Console.Write(""set:"" + value + "" ""); }
}
public C()
{
System.Console.Write(""Main "");
}
}";
string main = @"
public class D
{
static void Main()
{
M<C>();
}
static void M<T>() where T : I, new()
{
var t = new T() { Property = 42 };
_ = t.Property;
}
}
";
var libComp = CreateCompilation(new[] { parent, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
var comp = CreateCompilation(new[] { source, main }, references: new[] { emitImage ? libComp.EmitToImageReference() : libComp.ToMetadataReference() },
parseOptions: TestOptions.Regular9, options: TestOptions.DebugExe);
CompileAndVerify(comp, expectedOutput: "Main set:42 get:42");
libComp = CreateCompilation(new[] { parent, source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp = CreateCompilation(new[] { main }, references: new[] { emitImage ? libComp.EmitToImageReference() : libComp.ToMetadataReference() },
parseOptions: TestOptions.Regular9, options: TestOptions.DebugExe);
CompileAndVerify(comp, expectedOutput: "Main set:42 get:42");
}
[Fact]
public void DisallowedOnStaticMembers()
{
string source = @"
public class C
{
public static string Property { get; init; }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,42): error CS8806: The 'init' accessor is not valid on static members
// public static string Property { get; init; }
Diagnostic(ErrorCode.ERR_BadInitAccessor, "init").WithLocation(4, 42)
);
var property = (PropertySymbol)comp.GlobalNamespace.GetMember("C.Property");
Assert.False(property.GetMethod.IsInitOnly);
Assert.False(property.GetPublicSymbol().GetMethod.IsInitOnly);
Assert.False(property.SetMethod.IsInitOnly);
Assert.False(property.GetPublicSymbol().SetMethod.IsInitOnly);
}
[Fact]
public void DisallowedOnOtherInstances()
{
string source = @"
public class C
{
public string Property { get; init; }
public C c;
public C()
{
c.Property = null; // 1
}
public string InitOnlyProperty
{
init
{
c.Property = null; // 2
}
}
}
public class Derived : C
{
Derived()
{
c.Property = null; // 3
}
public string InitOnlyProperty2
{
init
{
c.Property = null; // 4
}
}
}
public class Caller
{
void M(C c)
{
_ = new C() {
Property =
(c.Property = null) // 5
};
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (9,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(9, 9),
// (16,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 2
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(16, 13),
// (24,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 3
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(24, 9),
// (31,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 4
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(31, 13),
// (41,18): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// (c.Property = null) // 5
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(41, 18)
);
}
[Fact]
public void DeconstructionAssignmentDisallowed()
{
string source = @"
public class C
{
public string Property { get; init; }
void M()
{
(Property, (Property, Property)) = (null, (null, null)); // 1, 2, 3
}
C()
{
(Property, (Property, Property)) = (null, (null, null));
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,10): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// (Property, (Property, Property)) = (null, (null, null)); // 1, 2, 3
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(8, 10),
// (8,21): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// (Property, (Property, Property)) = (null, (null, null)); // 1, 2, 3
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(8, 21),
// (8,31): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// (Property, (Property, Property)) = (null, (null, null)); // 1, 2, 3
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(8, 31)
);
}
[Fact]
public void OutParameterAssignmentDisallowed()
{
string source = @"
public class C
{
public string Property { get; init; }
void M()
{
M2(out Property); // 1
}
void M2(out string s) => throw null;
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,16): error CS0206: A non ref-returning property or indexer may not be used as an out or ref value
// M2(out Property); // 1
Diagnostic(ErrorCode.ERR_RefProperty, "Property").WithLocation(8, 16)
);
}
[Fact]
public void CompoundAssignmentDisallowed()
{
string source = @"
public class C
{
public int Property { get; init; }
void M()
{
Property += 42; // 1
}
C()
{
Property += 42;
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property += 42; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(8, 9)
);
}
[Fact]
public void CompoundAssignmentDisallowed_OrAssignment()
{
string source = @"
public class C
{
public bool Property { get; init; }
void M()
{
Property |= true; // 1
}
C()
{
Property |= true;
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property |= true; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(8, 9)
);
}
[Fact]
public void CompoundAssignmentDisallowed_NullCoalescingAssignment()
{
string source = @"
public class C
{
public string Property { get; init; }
void M()
{
Property ??= null; // 1
}
C()
{
Property ??= null;
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property ??= null; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(8, 9)
);
}
[Fact]
public void CompoundAssignmentDisallowed_Increment()
{
string source = @"
public class C
{
public int Property { get; init; }
void M()
{
Property++; // 1
}
C()
{
Property++;
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property++; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(8, 9)
);
}
[Fact]
public void RefProperty()
{
string source = @"
public class C
{
ref int Property1 { get; init; }
ref int Property2 { init; }
ref int Property3 { get => throw null; init => throw null; }
ref int Property4 { init => throw null; }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,13): error CS8145: Auto-implemented properties cannot return by reference
// ref int Property1 { get; init; }
Diagnostic(ErrorCode.ERR_AutoPropertyCannotBeRefReturning, "Property1").WithLocation(4, 13),
// (4,30): error CS8147: Properties which return by reference cannot have set accessors
// ref int Property1 { get; init; }
Diagnostic(ErrorCode.ERR_RefPropertyCannotHaveSetAccessor, "init").WithLocation(4, 30),
// (5,13): error CS8146: Properties which return by reference must have a get accessor
// ref int Property2 { init; }
Diagnostic(ErrorCode.ERR_RefPropertyMustHaveGetAccessor, "Property2").WithLocation(5, 13),
// (6,44): error CS8147: Properties which return by reference cannot have set accessors
// ref int Property3 { get => throw null; init => throw null; }
Diagnostic(ErrorCode.ERR_RefPropertyCannotHaveSetAccessor, "init").WithLocation(6, 44),
// (7,13): error CS8146: Properties which return by reference must have a get accessor
// ref int Property4 { init => throw null; }
Diagnostic(ErrorCode.ERR_RefPropertyMustHaveGetAccessor, "Property4").WithLocation(7, 13)
);
}
[Fact]
public void VerifyPESymbols_Property()
{
string source = @"
public class C
{
public string Property { get; init; }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition },
parseOptions: TestOptions.Regular9,
options: TestOptions.DebugDll.WithMetadataImportOptions(MetadataImportOptions.All));
comp.VerifyDiagnostics();
// PEVerify: [ : C::set_Property] Cannot change initonly field outside its .ctor.
CompileAndVerify(comp, sourceSymbolValidator: symbolValidator, symbolValidator: symbolValidator,
verify: Verification.FailsPEVerify);
void symbolValidator(ModuleSymbol m)
{
bool isSource = !(m is PEModuleSymbol);
var c = (NamedTypeSymbol)m.GlobalNamespace.GetMember("C");
var property = (PropertySymbol)c.GetMembers("Property").Single();
Assert.Equal("System.String C.Property { get; init; }", property.ToTestDisplayString());
Assert.Equal(0, property.CustomModifierCount());
var propertyAttributes = property.GetAttributes().Select(a => a.ToString());
AssertEx.Empty(propertyAttributes);
var getter = property.GetMethod;
Assert.Empty(property.GetMethod.ReturnTypeWithAnnotations.CustomModifiers);
Assert.False(getter.IsInitOnly);
Assert.False(getter.GetPublicSymbol().IsInitOnly);
var getterAttributes = getter.GetAttributes().Select(a => a.ToString());
if (isSource)
{
AssertEx.Empty(getterAttributes);
}
else
{
AssertEx.Equal(new[] { "System.Runtime.CompilerServices.CompilerGeneratedAttribute" }, getterAttributes);
}
var setter = property.SetMethod;
Assert.True(setter.IsInitOnly);
Assert.True(setter.GetPublicSymbol().IsInitOnly);
var setterAttributes = property.SetMethod.GetAttributes().Select(a => a.ToString());
var modifier = property.SetMethod.ReturnTypeWithAnnotations.CustomModifiers.Single();
Assert.Equal("System.Runtime.CompilerServices.IsExternalInit", modifier.Modifier.ToTestDisplayString());
Assert.False(modifier.IsOptional);
if (isSource)
{
AssertEx.Empty(setterAttributes);
}
else
{
AssertEx.Equal(new[] { "System.Runtime.CompilerServices.CompilerGeneratedAttribute" }, setterAttributes);
}
var backingField = (FieldSymbol)c.GetMembers("<Property>k__BackingField").Single();
var backingFieldAttributes = backingField.GetAttributes().Select(a => a.ToString());
Assert.True(backingField.IsReadOnly);
if (isSource)
{
AssertEx.Empty(backingFieldAttributes);
}
else
{
AssertEx.Equal(
new[] { "System.Runtime.CompilerServices.CompilerGeneratedAttribute",
"System.Diagnostics.DebuggerBrowsableAttribute(System.Diagnostics.DebuggerBrowsableState.Never)" },
backingFieldAttributes);
var peBackingField = (PEFieldSymbol)backingField;
Assert.Equal(System.Reflection.FieldAttributes.InitOnly | System.Reflection.FieldAttributes.Private, peBackingField.Flags);
}
}
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public void AssignmentDisallowed_PE(bool emitImage)
{
string lib_cs = @"
public class C
{
public string Property { get; init; }
}
";
var libComp = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
libComp.VerifyDiagnostics();
string source = @"
public class Other
{
public C c;
void M()
{
c.Property = null; // 1
}
public Other()
{
c.Property = null; // 2
}
public string InitOnlyProperty
{
get
{
c.Property = null; // 3
return null;
}
init
{
c.Property = null; // 4
}
}
public string RegularProperty
{
get
{
c.Property = null; // 5
return null;
}
set
{
c.Property = null; // 6
}
}
}
class Derived : C
{
}
class Derived2 : Derived
{
void M()
{
Property = null; // 7
base.Property = null; // 8
}
Derived2()
{
Property = null;
base.Property = null;
}
public string InitOnlyProperty2
{
get
{
Property = null; // 9
base.Property = null; // 10
return null;
}
init
{
Property = null;
base.Property = null;
}
}
public string RegularProperty2
{
get
{
Property = null; // 11
base.Property = null; // 12
return null;
}
set
{
Property = null; // 13
base.Property = null; // 14
}
}
}
";
var comp = CreateCompilation(source,
references: new[] { emitImage ? libComp.EmitToImageReference() : libComp.ToMetadataReference() },
parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(8, 9),
// (13,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 2
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(13, 9),
// (20,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 3
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(20, 13),
// (25,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 4
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(25, 13),
// (33,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 5
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(33, 13),
// (38,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c.Property = null; // 6
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c.Property").WithArguments("C.Property").WithLocation(38, 13),
// (51,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 7
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(51, 9),
// (52,9): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// base.Property = null; // 8
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "base.Property").WithArguments("C.Property").WithLocation(52, 9),
// (65,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 9
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(65, 13),
// (66,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// base.Property = null; // 10
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "base.Property").WithArguments("C.Property").WithLocation(66, 13),
// (80,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 11
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(80, 13),
// (81,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// base.Property = null; // 12
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "base.Property").WithArguments("C.Property").WithLocation(81, 13),
// (86,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Property = null; // 13
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("C.Property").WithLocation(86, 13),
// (87,13): error CS8802: Init-only property or indexer 'C.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// base.Property = null; // 14
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "base.Property").WithArguments("C.Property").WithLocation(87, 13)
);
}
[Fact, WorkItem(50053, "https://github.com/dotnet/roslyn/issues/50053")]
public void PrivatelyImplementingInitOnlyProperty_ReferenceConversion()
{
string source = @"
var x = new DerivedType() { SomethingElse = 42 };
System.Console.Write(x.SomethingElse);
public interface ISomething { int Property { get; init; } }
public record BaseType : ISomething { int ISomething.Property { get; init; } }
public record DerivedType : BaseType
{
public int SomethingElse
{
get => ((ISomething)this).Property;
init => ((ISomething)this).Property = value;
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, options: TestOptions.DebugExe);
comp.VerifyEmitDiagnostics(
// (13,17): error CS8852: Init-only property or indexer 'ISomething.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// init => ((ISomething)this).Property = value;
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "((ISomething)this).Property").WithArguments("ISomething.Property").WithLocation(13, 17)
);
}
[Fact, WorkItem(50053, "https://github.com/dotnet/roslyn/issues/50053")]
public void PrivatelyImplementingInitOnlyProperty_BoxingConversion()
{
string source = @"
var x = new Type() { SomethingElse = 42 };
public interface ISomething { int Property { get; init; } }
public struct Type : ISomething
{
int ISomething.Property { get; init; }
public int SomethingElse
{
get => throw null;
init => ((ISomething)this).Property = value;
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, options: TestOptions.DebugExe);
comp.VerifyDiagnostics(
// (13,17): error CS8852: Init-only property or indexer 'ISomething.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// init => ((ISomething)this).Property = value;
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "((ISomething)this).Property").WithArguments("ISomething.Property").WithLocation(13, 17)
);
}
[Fact]
public void OverridingInitOnlyProperty()
{
string source = @"
public class Base
{
public virtual string Property { get; init; }
}
public class DerivedWithInit : Base
{
public override string Property { get; init; }
}
public class DerivedWithoutInit : Base
{
public override string Property { get; set; } // 1
}
public class DerivedWithInitSetterOnly : Base
{
public override string Property { init { } }
}
public class DerivedWithoutInitSetterOnly : Base
{
public override string Property { set { } } // 2
}
public class DerivedGetterOnly : Base
{
public override string Property { get => null; }
}
public class DerivedDerivedWithInit : DerivedGetterOnly
{
public override string Property { init { } }
}
public class DerivedDerivedWithoutInit : DerivedGetterOnly
{
public override string Property { set { } } // 3
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (13,28): error CS8803: 'DerivedWithoutInit.Property' must match by init-only of overridden member 'Base.Property'
// public override string Property { get; set; } // 1
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "Property").WithArguments("DerivedWithoutInit.Property", "Base.Property").WithLocation(13, 28),
// (22,28): error CS8803: 'DerivedWithoutInitSetterOnly.Property' must match by init-only of overridden member 'Base.Property'
// public override string Property { set { } } // 2
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "Property").WithArguments("DerivedWithoutInitSetterOnly.Property", "Base.Property").WithLocation(22, 28),
// (35,28): error CS8803: 'DerivedDerivedWithoutInit.Property' must match by init-only of overridden member 'DerivedGetterOnly.Property'
// public override string Property { set { } } // 3
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "Property").WithArguments("DerivedDerivedWithoutInit.Property", "DerivedGetterOnly.Property").WithLocation(35, 28)
);
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public void OverridingInitOnlyProperty_Metadata(bool emitAsImage)
{
string lib_cs = @"
public class Base
{
public virtual string Property { get; init; }
}";
var libComp = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
libComp.VerifyDiagnostics();
string source = @"
public class DerivedWithInit : Base
{
public override string Property { get; init; }
}
public class DerivedWithoutInit : Base
{
public override string Property { get; set; } // 1
}
public class DerivedWithInitSetterOnly : Base
{
public override string Property { init { } }
}
public class DerivedWithoutInitSetterOnly : Base
{
public override string Property { set { } } // 2
}
public class DerivedGetterOnly : Base
{
public override string Property { get => null; }
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular9,
references: new[] { emitAsImage ? libComp.EmitToImageReference() : libComp.ToMetadataReference() });
comp.VerifyEmitDiagnostics(
// (8,28): error CS8803: 'DerivedWithoutInit.Property' must match by init-only of overridden member 'Base.Property'
// public override string Property { get; set; } // 1
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "Property").WithArguments("DerivedWithoutInit.Property", "Base.Property").WithLocation(8, 28),
// (16,28): error CS8803: 'DerivedWithoutInitSetterOnly.Property' must match by init-only of overridden member 'Base.Property'
// public override string Property { set { } } // 2
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "Property").WithArguments("DerivedWithoutInitSetterOnly.Property", "Base.Property").WithLocation(16, 28)
);
}
[Fact]
public void OverridingRegularProperty()
{
string source = @"
public class Base
{
public virtual string Property { get; set; }
}
public class DerivedWithInit : Base
{
public override string Property { get; init; } // 1
}
public class DerivedWithoutInit : Base
{
public override string Property { get; set; }
}
public class DerivedWithInitSetterOnly : Base
{
public override string Property { init { } } // 2
}
public class DerivedWithoutInitSetterOnly : Base
{
public override string Property { set { } }
}
public class DerivedGetterOnly : Base
{
public override string Property { get => null; }
}
public class DerivedDerivedWithInit : DerivedGetterOnly
{
public override string Property { init { } } // 3
}
public class DerivedDerivedWithoutInit : DerivedGetterOnly
{
public override string Property { set { } }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (9,28): error CS8803: 'DerivedWithInit.Property' must match by init-only of overridden member 'Base.Property'
// public override string Property { get; init; } // 1
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "Property").WithArguments("DerivedWithInit.Property", "Base.Property").WithLocation(9, 28),
// (18,28): error CS8803: 'DerivedWithInitSetterOnly.Property' must match by init-only of overridden member 'Base.Property'
// public override string Property { init { } } // 2
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "Property").WithArguments("DerivedWithInitSetterOnly.Property", "Base.Property").WithLocation(18, 28),
// (31,28): error CS8803: 'DerivedDerivedWithInit.Property' must match by init-only of overridden member 'DerivedGetterOnly.Property'
// public override string Property { init { } } // 3
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "Property").WithArguments("DerivedDerivedWithInit.Property", "DerivedGetterOnly.Property").WithLocation(31, 28)
);
}
[Fact]
public void OverridingGetterOnlyProperty()
{
string source = @"
public class Base
{
public virtual string Property { get => null; }
}
public class DerivedWithInit : Base
{
public override string Property { get; init; } // 1
}
public class DerivedWithoutInit : Base
{
public override string Property { get; set; } // 2
}
public class DerivedWithInitSetterOnly : Base
{
public override string Property { init { } } // 3
}
public class DerivedWithoutInitSetterOnly : Base
{
public override string Property { set { } } // 4
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,44): error CS0546: 'DerivedWithInit.Property.init': cannot override because 'Base.Property' does not have an overridable set accessor
// public override string Property { get; init; } // 1
Diagnostic(ErrorCode.ERR_NoSetToOverride, "init").WithArguments("DerivedWithInit.Property.init", "Base.Property").WithLocation(8, 44),
// (12,44): error CS0546: 'DerivedWithoutInit.Property.set': cannot override because 'Base.Property' does not have an overridable set accessor
// public override string Property { get; set; } // 2
Diagnostic(ErrorCode.ERR_NoSetToOverride, "set").WithArguments("DerivedWithoutInit.Property.set", "Base.Property").WithLocation(12, 44),
// (16,39): error CS0546: 'DerivedWithInitSetterOnly.Property.init': cannot override because 'Base.Property' does not have an overridable set accessor
// public override string Property { init { } } // 3
Diagnostic(ErrorCode.ERR_NoSetToOverride, "init").WithArguments("DerivedWithInitSetterOnly.Property.init", "Base.Property").WithLocation(16, 39),
// (20,39): error CS0546: 'DerivedWithoutInitSetterOnly.Property.set': cannot override because 'Base.Property' does not have an overridable set accessor
// public override string Property { set { } } // 4
Diagnostic(ErrorCode.ERR_NoSetToOverride, "set").WithArguments("DerivedWithoutInitSetterOnly.Property.set", "Base.Property").WithLocation(20, 39)
);
}
[Fact]
public void OverridingSetterOnlyProperty()
{
string source = @"
public class Base
{
public virtual string Property { set { } }
}
public class DerivedWithInit : Base
{
public override string Property { get; init; } // 1, 2
}
public class DerivedWithoutInit : Base
{
public override string Property { get; set; } // 3
}
public class DerivedWithInitSetterOnly : Base
{
public override string Property { init { } } // 4
}
public class DerivedWithoutInitGetterOnly : Base
{
public override string Property { get => null; } // 5
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,28): error CS8803: 'DerivedWithInit.Property' must match by init-only of overridden member 'Base.Property'
// public override string Property { get; init; } // 1, 2
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "Property").WithArguments("DerivedWithInit.Property", "Base.Property").WithLocation(8, 28),
// (8,39): error CS0545: 'DerivedWithInit.Property.get': cannot override because 'Base.Property' does not have an overridable get accessor
// public override string Property { get; init; } // 1, 2
Diagnostic(ErrorCode.ERR_NoGetToOverride, "get").WithArguments("DerivedWithInit.Property.get", "Base.Property").WithLocation(8, 39),
// (12,39): error CS0545: 'DerivedWithoutInit.Property.get': cannot override because 'Base.Property' does not have an overridable get accessor
// public override string Property { get; set; } // 3
Diagnostic(ErrorCode.ERR_NoGetToOverride, "get").WithArguments("DerivedWithoutInit.Property.get", "Base.Property").WithLocation(12, 39),
// (16,28): error CS8803: 'DerivedWithInitSetterOnly.Property' must match by init-only of overridden member 'Base.Property'
// public override string Property { init { } } // 4
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "Property").WithArguments("DerivedWithInitSetterOnly.Property", "Base.Property").WithLocation(16, 28),
// (20,39): error CS0545: 'DerivedWithoutInitGetterOnly.Property.get': cannot override because 'Base.Property' does not have an overridable get accessor
// public override string Property { get => null; } // 5
Diagnostic(ErrorCode.ERR_NoGetToOverride, "get").WithArguments("DerivedWithoutInitGetterOnly.Property.get", "Base.Property").WithLocation(20, 39)
);
}
[Fact]
public void ImplementingInitOnlyProperty()
{
string source = @"
public interface I
{
string Property { get; init; }
}
public class DerivedWithInit : I
{
public string Property { get; init; }
}
public class DerivedWithoutInit : I // 1
{
public string Property { get; set; }
}
public class DerivedWithInitSetterOnly : I // 2
{
public string Property { init { } }
}
public class DerivedWithoutInitGetterOnly : I // 3
{
public string Property { get => null; }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (10,35): error CS8804: 'DerivedWithoutInit' does not implement interface member 'I.Property.init'. 'DerivedWithoutInit.Property.set' cannot implement 'I.Property.init'.
// public class DerivedWithoutInit : I // 1
Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongInitOnly, "I").WithArguments("DerivedWithoutInit", "I.Property.init", "DerivedWithoutInit.Property.set").WithLocation(10, 35),
// (14,42): error CS0535: 'DerivedWithInitSetterOnly' does not implement interface member 'I.Property.get'
// public class DerivedWithInitSetterOnly : I // 2
Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, "I").WithArguments("DerivedWithInitSetterOnly", "I.Property.get").WithLocation(14, 42),
// (18,45): error CS0535: 'DerivedWithoutInitGetterOnly' does not implement interface member 'I.Property.init'
// public class DerivedWithoutInitGetterOnly : I // 3
Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, "I").WithArguments("DerivedWithoutInitGetterOnly", "I.Property.init").WithLocation(18, 45)
);
}
[Fact]
public void ImplementingSetterOnlyProperty()
{
string source = @"
public interface I
{
string Property { set; }
}
public class DerivedWithInit : I // 1
{
public string Property { get; init; }
}
public class DerivedWithoutInit : I
{
public string Property { get; set; }
}
public class DerivedWithInitSetterOnly : I // 2
{
public string Property { init { } }
}
public class DerivedWithoutInitGetterOnly : I // 3
{
public string Property { get => null; }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (6,32): error CS8804: 'DerivedWithInit' does not implement interface member 'I.Property.set'. 'DerivedWithInit.Property.init' cannot implement 'I.Property.set'.
// public class DerivedWithInit : I // 1
Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongInitOnly, "I").WithArguments("DerivedWithInit", "I.Property.set", "DerivedWithInit.Property.init").WithLocation(6, 32),
// (14,42): error CS8804: 'DerivedWithInitSetterOnly' does not implement interface member 'I.Property.set'. 'DerivedWithInitSetterOnly.Property.init' cannot implement 'I.Property.set'.
// public class DerivedWithInitSetterOnly : I // 2
Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongInitOnly, "I").WithArguments("DerivedWithInitSetterOnly", "I.Property.set", "DerivedWithInitSetterOnly.Property.init").WithLocation(14, 42),
// (18,45): error CS0535: 'DerivedWithoutInitGetterOnly' does not implement interface member 'I.Property.set'
// public class DerivedWithoutInitGetterOnly : I // 3
Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, "I").WithArguments("DerivedWithoutInitGetterOnly", "I.Property.set").WithLocation(18, 45)
);
}
[Fact]
public void ObjectCreationOnInterface()
{
string source = @"
public interface I
{
string Property { set; }
string InitProperty { init; }
}
public class C
{
void M<T>() where T: I, new()
{
_ = new T() { Property = null, InitProperty = null };
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyDiagnostics();
}
[Fact]
public void HidingInitOnlySetterOnlyProperty()
{
string source = @"
public class Base
{
public string Property { init { } }
}
public class Derived : Base
{
public string Property { init { } } // 1
}
public class DerivedWithNew : Base
{
public new string Property { init { } }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,19): warning CS0108: 'Derived.Property' hides inherited member 'Base.Property'. Use the new keyword if hiding was intended.
// public string Property { init { } } // 1
Diagnostic(ErrorCode.WRN_NewRequired, "Property").WithArguments("Derived.Property", "Base.Property").WithLocation(8, 19)
);
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public void ImplementingSetterOnlyProperty_Metadata(bool emitAsImage)
{
string lib_cs = @"
public interface I
{
string Property { set; }
}";
var libComp = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
libComp.VerifyEmitDiagnostics();
string source = @"
public class DerivedWithInit : I // 1
{
public string Property { get; init; }
}
public class DerivedWithoutInit : I
{
public string Property { get; set; }
}
public class DerivedWithInitSetterOnly : I // 2
{
public string Property { init { } }
}
public class DerivedWithoutInitGetterOnly : I // 3
{
public string Property { get => null; }
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular9,
references: new[] { emitAsImage ? libComp.EmitToImageReference() : libComp.ToMetadataReference() });
comp.VerifyEmitDiagnostics(
// (2,32): error CS8804: 'DerivedWithInit' does not implement interface member 'I.Property.set'. 'DerivedWithInit.Property.init' cannot implement 'I.Property.set'.
// public class DerivedWithInit : I // 1
Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongInitOnly, "I").WithArguments("DerivedWithInit", "I.Property.set", "DerivedWithInit.Property.init").WithLocation(2, 32),
// (10,42): error CS8804: 'DerivedWithInitSetterOnly' does not implement interface member 'I.Property.set'. 'DerivedWithInitSetterOnly.Property.init' cannot implement 'I.Property.set'.
// public class DerivedWithInitSetterOnly : I // 2
Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongInitOnly, "I").WithArguments("DerivedWithInitSetterOnly", "I.Property.set", "DerivedWithInitSetterOnly.Property.init").WithLocation(10, 42),
// (14,45): error CS0535: 'DerivedWithoutInitGetterOnly' does not implement interface member 'I.Property.set'
// public class DerivedWithoutInitGetterOnly : I // 3
Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, "I").WithArguments("DerivedWithoutInitGetterOnly", "I.Property.set").WithLocation(14, 45)
);
}
[Fact]
public void ImplementingSetterOnlyProperty_Explicitly()
{
string source = @"
public interface I
{
string Property { set; }
}
public class DerivedWithInit : I
{
string I.Property { init { } } // 1
}
public class DerivedWithInitAndGetter : I
{
string I.Property { get; init; } // 2, 3
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,25): error CS8805: Accessors 'DerivedWithInit.I.Property.init' and 'I.Property.set' should both be init-only or neither
// string I.Property { init { } } // 1
Diagnostic(ErrorCode.ERR_ExplicitPropertyMismatchInitOnly, "init").WithArguments("DerivedWithInit.I.Property.init", "I.Property.set").WithLocation(8, 25),
// (12,25): error CS0550: 'DerivedWithInitAndGetter.I.Property.get' adds an accessor not found in interface member 'I.Property'
// string I.Property { get; init; } // 2, 3
Diagnostic(ErrorCode.ERR_ExplicitPropertyAddingAccessor, "get").WithArguments("DerivedWithInitAndGetter.I.Property.get", "I.Property").WithLocation(12, 25),
// (12,30): error CS8805: Accessors 'DerivedWithInitAndGetter.I.Property.init' and 'I.Property.set' should both be init-only or neither
// string I.Property { get; init; } // 2, 3
Diagnostic(ErrorCode.ERR_ExplicitPropertyMismatchInitOnly, "init").WithArguments("DerivedWithInitAndGetter.I.Property.init", "I.Property.set").WithLocation(12, 30)
);
}
[Fact]
public void ImplementingSetterOnlyInitOnlyProperty_Explicitly()
{
string source = @"
public interface I
{
string Property { init; }
}
public class DerivedWithoutInit : I
{
string I.Property { set { } } // 1
}
public class DerivedWithInit : I
{
string I.Property { init { } }
}
public class DerivedWithInitAndGetter : I
{
string I.Property { get; init; } // 2
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (8,25): error CS8805: Accessors 'DerivedWithoutInit.I.Property.set' and 'I.Property.init' should both be init-only or neither
// string I.Property { set { } } // 1
Diagnostic(ErrorCode.ERR_ExplicitPropertyMismatchInitOnly, "set").WithArguments("DerivedWithoutInit.I.Property.set", "I.Property.init").WithLocation(8, 25),
// (16,25): error CS0550: 'DerivedWithInitAndGetter.I.Property.get' adds an accessor not found in interface member 'I.Property'
// string I.Property { get; init; } // 2
Diagnostic(ErrorCode.ERR_ExplicitPropertyAddingAccessor, "get").WithArguments("DerivedWithInitAndGetter.I.Property.get", "I.Property").WithLocation(16, 25)
);
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public void ImplementingSetterOnlyInitOnlyProperty_Metadata_Explicitly(bool emitAsImage)
{
string lib_cs = @"
public interface I
{
string Property { init; }
}";
var libComp = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
libComp.VerifyDiagnostics();
string source = @"
public class DerivedWithoutInit : I
{
string I.Property { set { } } // 1
}
public class DerivedWithInit : I
{
string I.Property { init { } }
}
public class DerivedGetterOnly : I // 2
{
string I.Property { get => null; } // 3, 4
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular9,
references: new[] { emitAsImage ? libComp.EmitToImageReference() : libComp.ToMetadataReference() });
comp.VerifyEmitDiagnostics(
// (4,25): error CS8805: Accessors 'DerivedWithoutInit.I.Property.set' and 'I.Property.init' should both be init-only or neither
// string I.Property { set { } } // 1
Diagnostic(ErrorCode.ERR_ExplicitPropertyMismatchInitOnly, "set").WithArguments("DerivedWithoutInit.I.Property.set", "I.Property.init").WithLocation(4, 25),
// (10,34): error CS0535: 'DerivedGetterOnly' does not implement interface member 'I.Property.init'
// public class DerivedGetterOnly : I // 2
Diagnostic(ErrorCode.ERR_UnimplementedInterfaceMember, "I").WithArguments("DerivedGetterOnly", "I.Property.init").WithLocation(10, 34),
// (12,14): error CS0551: Explicit interface implementation 'DerivedGetterOnly.I.Property' is missing accessor 'I.Property.init'
// string I.Property { get => null; } // 3, 4
Diagnostic(ErrorCode.ERR_ExplicitPropertyMissingAccessor, "Property").WithArguments("DerivedGetterOnly.I.Property", "I.Property.init").WithLocation(12, 14),
// (12,25): error CS0550: 'DerivedGetterOnly.I.Property.get' adds an accessor not found in interface member 'I.Property'
// string I.Property { get => null; } // 3, 4
Diagnostic(ErrorCode.ERR_ExplicitPropertyAddingAccessor, "get").WithArguments("DerivedGetterOnly.I.Property.get", "I.Property").WithLocation(12, 25)
);
}
[Fact]
public void DIM_TwoInitOnlySetters()
{
string source = @"
public interface I1
{
string Property { init; }
}
public interface I2
{
string Property { init; }
}
public interface IWithoutInit : I1, I2
{
string Property { set; } // 1
}
public interface IWithInit : I1, I2
{
string Property { init; } // 2
}
public interface IWithInitWithNew : I1, I2
{
new string Property { init; }
}
public interface IWithInitWithDefaultImplementation : I1, I2
{
string Property { init { } } // 3
}
public interface IWithInitWithExplicitImplementation : I1, I2
{
string I1.Property { init { } }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition },
targetFramework: TargetFramework.NetCoreApp,
parseOptions: TestOptions.Regular9);
Assert.True(comp.Assembly.RuntimeSupportsDefaultInterfaceImplementation);
Assert.True(comp.SupportsRuntimeCapability(RuntimeCapability.DefaultImplementationsOfInterfaces));
comp.VerifyEmitDiagnostics(
// (12,12): warning CS0108: 'IWithoutInit.Property' hides inherited member 'I1.Property'. Use the new keyword if hiding was intended.
// string Property { set; } // 1
Diagnostic(ErrorCode.WRN_NewRequired, "Property").WithArguments("IWithoutInit.Property", "I1.Property").WithLocation(12, 12),
// (16,12): warning CS0108: 'IWithInit.Property' hides inherited member 'I1.Property'. Use the new keyword if hiding was intended.
// string Property { init; } // 2
Diagnostic(ErrorCode.WRN_NewRequired, "Property").WithArguments("IWithInit.Property", "I1.Property").WithLocation(16, 12),
// (24,12): warning CS0108: 'IWithInitWithDefaultImplementation.Property' hides inherited member 'I1.Property'. Use the new keyword if hiding was intended.
// string Property { init { } } // 3
Diagnostic(ErrorCode.WRN_NewRequired, "Property").WithArguments("IWithInitWithDefaultImplementation.Property", "I1.Property").WithLocation(24, 12)
);
}
[Fact]
public void DIM_OneInitOnlySetter()
{
string source = @"
public interface I1
{
string Property { init; }
}
public interface I2
{
string Property { set; }
}
public interface IWithoutInit : I1, I2
{
string Property { set; } // 1
}
public interface IWithInit : I1, I2
{
string Property { init; } // 2
}
public interface IWithInitWithNew : I1, I2
{
new string Property { init; }
}
public interface IWithoutInitWithNew : I1, I2
{
new string Property { set; }
}
public interface IWithInitWithImplementation : I1, I2
{
string Property { init { } } // 3
}
public interface IWithInitWithExplicitImplementationOfI1 : I1, I2
{
string I1.Property { init { } }
}
public interface IWithInitWithExplicitImplementationOfI2 : I1, I2
{
string I2.Property { init { } } // 4
}
public interface IWithoutInitWithExplicitImplementationOfI1 : I1, I2
{
string I1.Property { set { } } // 5
}
public interface IWithoutInitWithExplicitImplementationOfI2 : I1, I2
{
string I2.Property { set { } }
}
public interface IWithoutInitWithExplicitImplementationOfBoth : I1, I2
{
string I1.Property { init { } }
string I2.Property { set { } }
}
public class CWithExplicitImplementation : I1, I2
{
string I1.Property { init { } }
string I2.Property { set { } }
}
public class CWithImplementationWithInitOnly : I1, I2 // 6
{
public string Property { init { } }
}
public class CWithImplementationWithoutInitOnly : I1, I2 // 7
{
public string Property { set { } }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition },
targetFramework: TargetFramework.NetCoreApp,
parseOptions: TestOptions.Regular9);
Assert.True(comp.Assembly.RuntimeSupportsDefaultInterfaceImplementation);
Assert.True(comp.SupportsRuntimeCapability(RuntimeCapability.DefaultImplementationsOfInterfaces));
comp.VerifyEmitDiagnostics(
// (13,12): warning CS0108: 'IWithoutInit.Property' hides inherited member 'I1.Property'. Use the new keyword if hiding was intended.
// string Property { set; } // 1
Diagnostic(ErrorCode.WRN_NewRequired, "Property").WithArguments("IWithoutInit.Property", "I1.Property").WithLocation(13, 12),
// (17,12): warning CS0108: 'IWithInit.Property' hides inherited member 'I1.Property'. Use the new keyword if hiding was intended.
// string Property { init; } // 2
Diagnostic(ErrorCode.WRN_NewRequired, "Property").WithArguments("IWithInit.Property", "I1.Property").WithLocation(17, 12),
// (31,12): warning CS0108: 'IWithInitWithImplementation.Property' hides inherited member 'I1.Property'. Use the new keyword if hiding was intended.
// string Property { init { } } // 3
Diagnostic(ErrorCode.WRN_NewRequired, "Property").WithArguments("IWithInitWithImplementation.Property", "I1.Property").WithLocation(31, 12),
// (40,26): error CS8805: Accessors 'IWithInitWithExplicitImplementationOfI2.I2.Property.init' and 'I2.Property.set' should both be init-only or neither
// string I2.Property { init { } } // 4
Diagnostic(ErrorCode.ERR_ExplicitPropertyMismatchInitOnly, "init").WithArguments("IWithInitWithExplicitImplementationOfI2.I2.Property.init", "I2.Property.set").WithLocation(40, 26),
// (45,26): error CS8805: Accessors 'IWithoutInitWithExplicitImplementationOfI1.I1.Property.set' and 'I1.Property.init' should both be init-only or neither
// string I1.Property { set { } } // 5
Diagnostic(ErrorCode.ERR_ExplicitPropertyMismatchInitOnly, "set").WithArguments("IWithoutInitWithExplicitImplementationOfI1.I1.Property.set", "I1.Property.init").WithLocation(45, 26),
// (62,52): error CS8804: 'CWithImplementationWithInitOnly' does not implement interface member 'I2.Property.set'. 'CWithImplementationWithInitOnly.Property.init' cannot implement 'I2.Property.set'.
// public class CWithImplementationWithInitOnly : I1, I2 // 6
Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongInitOnly, "I2").WithArguments("CWithImplementationWithInitOnly", "I2.Property.set", "CWithImplementationWithInitOnly.Property.init").WithLocation(62, 52),
// (66,51): error CS8804: 'CWithImplementationWithoutInitOnly' does not implement interface member 'I1.Property.init'. 'CWithImplementationWithoutInitOnly.Property.set' cannot implement 'I1.Property.init'.
// public class CWithImplementationWithoutInitOnly : I1, I2 // 7
Diagnostic(ErrorCode.ERR_CloseUnimplementedInterfaceMemberWrongInitOnly, "I1").WithArguments("CWithImplementationWithoutInitOnly", "I1.Property.init", "CWithImplementationWithoutInitOnly.Property.set").WithLocation(66, 51)
);
}
[Fact]
public void EventWithInitOnly()
{
string source = @"
public class C
{
public event System.Action Event
{
init { }
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,32): error CS0065: 'C.Event': event property must have both add and remove accessors
// public event System.Action Event
Diagnostic(ErrorCode.ERR_EventNeedsBothAccessors, "Event").WithArguments("C.Event").WithLocation(4, 32),
// (6,9): error CS1055: An add or remove accessor expected
// init { }
Diagnostic(ErrorCode.ERR_AddOrRemoveExpected, "init").WithLocation(6, 9)
);
var members = ((NamedTypeSymbol)comp.GlobalNamespace.GetMember("C")).GetMembers();
AssertEx.SetEqual(members.ToTestDisplayStrings(), new[] {
"event System.Action C.Event",
"C..ctor()"
});
}
[Fact]
public void EventAccessorsAreNotInitOnly()
{
string source = @"
public class C
{
public event System.Action Event
{
add { }
remove { }
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyDiagnostics();
var eventSymbol = comp.GlobalNamespace.GetMember<EventSymbol>("C.Event");
Assert.False(eventSymbol.AddMethod.IsInitOnly);
Assert.False(eventSymbol.GetPublicSymbol().AddMethod.IsInitOnly);
Assert.False(eventSymbol.RemoveMethod.IsInitOnly);
Assert.False(eventSymbol.GetPublicSymbol().RemoveMethod.IsInitOnly);
}
[Fact]
public void ConstructorAndDestructorAreNotInitOnly()
{
string source = @"
public class C
{
public C() { }
~C() { }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyDiagnostics();
var constructor = comp.GlobalNamespace.GetMember<SourceConstructorSymbol>("C..ctor");
Assert.False(constructor.IsInitOnly);
Assert.False(constructor.GetPublicSymbol().IsInitOnly);
var destructor = comp.GlobalNamespace.GetMember<SourceDestructorSymbol>("C.Finalize");
Assert.False(destructor.IsInitOnly);
Assert.False(destructor.GetPublicSymbol().IsInitOnly);
}
[Fact]
public void OperatorsAreNotInitOnly()
{
string source = @"
public class C
{
public static implicit operator int(C c) => throw null;
public static bool operator +(C c1, C c2) => throw null;
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyDiagnostics();
var conversion = comp.GlobalNamespace.GetMember<SourceUserDefinedConversionSymbol>("C.op_Implicit");
Assert.False(conversion.IsInitOnly);
Assert.False(conversion.GetPublicSymbol().IsInitOnly);
var addition = comp.GlobalNamespace.GetMember<SourceUserDefinedOperatorSymbol>("C.op_Addition");
Assert.False(addition.IsInitOnly);
Assert.False(addition.GetPublicSymbol().IsInitOnly);
}
[Fact]
public void ConstructedMethodsAreNotInitOnly()
{
string source = @"
public class C
{
void M<T>()
{
M<string>();
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyDiagnostics();
var tree = comp.SyntaxTrees[0];
var root = tree.GetCompilationUnitRoot();
var model = comp.GetSemanticModel(tree, ignoreAccessibility: true);
var invocation = root.DescendantNodes().OfType<InvocationExpressionSyntax>().Single();
var method = (IMethodSymbol)model.GetSymbolInfo(invocation).Symbol;
Assert.Equal("void C.M<System.String>()", method.ToTestDisplayString());
Assert.False(method.IsInitOnly);
}
[Fact]
public void InitOnlyOnMembersOfRecords()
{
string source = @"
public record C(int i)
{
void M() { }
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyDiagnostics();
var cMembers = comp.GlobalNamespace.GetMember<NamedTypeSymbol>("C").GetMembers();
AssertEx.SetEqual(new[] {
"C C." + WellKnownMemberNames.CloneMethodName + "()",
"System.Type C.EqualityContract.get",
"System.Type C.EqualityContract { get; }",
"C..ctor(System.Int32 i)",
"System.Int32 C.<i>k__BackingField",
"System.Int32 C.i.get",
"void modreq(System.Runtime.CompilerServices.IsExternalInit) C.i.init",
"System.Int32 C.i { get; init; }",
"void C.M()",
"System.String C.ToString()",
"System.Boolean C." + WellKnownMemberNames.PrintMembersMethodName + "(System.Text.StringBuilder builder)",
"System.Boolean C.op_Inequality(C? left, C? right)",
"System.Boolean C.op_Equality(C? left, C? right)",
"System.Int32 C.GetHashCode()",
"System.Boolean C.Equals(System.Object? obj)",
"System.Boolean C.Equals(C? other)",
"C..ctor(C original)",
"void C.Deconstruct(out System.Int32 i)",
}, cMembers.ToTestDisplayStrings());
foreach (var member in cMembers)
{
if (member is MethodSymbol method)
{
bool isSetter = method.MethodKind == MethodKind.PropertySet;
Assert.Equal(isSetter, method.IsInitOnly);
Assert.Equal(isSetter, method.GetPublicSymbol().IsInitOnly);
}
}
}
[Fact]
public void IndexerWithInitOnly()
{
string source = @"
public class C
{
public string this[int i]
{
init { }
}
public C()
{
this[42] = null;
}
public void M1()
{
this[43] = null; // 1
}
}
public class Derived : C
{
public Derived()
{
this[44] = null;
}
public void M2()
{
this[45] = null; // 2
}
}
public class D
{
void M3(C c2)
{
_ = new C() { [46] = null };
c2[47] = null; // 3
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (14,9): error CS8802: Init-only property or indexer 'C.this[int]' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// this[43] = null; // 1
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "this[43]").WithArguments("C.this[int]").WithLocation(14, 9),
// (25,9): error CS8802: Init-only property or indexer 'C.this[int]' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// this[45] = null; // 2
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "this[45]").WithArguments("C.this[int]").WithLocation(25, 9),
// (33,9): error CS8802: Init-only property or indexer 'C.this[int]' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// c2[47] = null; // 3
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "c2[47]").WithArguments("C.this[int]").WithLocation(33, 9)
);
}
[Fact]
public void ReadonlyFields()
{
string source = @"
public class C
{
public readonly string field;
public C()
{
field = null;
}
public void M1()
{
field = null; // 1
_ = new C() { field = null }; // 2
}
public int InitOnlyProperty1
{
init
{
@field = null;
}
}
public int RegularProperty
{
get
{
@field = null; // 3
throw null;
}
set
{
@field = null; // 4
}
}
}
public class Derived : C
{
public Derived()
{
field = null; // 5
}
public void M2()
{
field = null; // 6
}
public int InitOnlyProperty2
{
init
{
@field = null; // 7
}
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// 0.cs(11,9): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// field = null; // 1
Diagnostic(ErrorCode.ERR_AssgReadonly, "field").WithLocation(11, 9),
// 0.cs(12,23): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// _ = new C() { field = null }; // 2
Diagnostic(ErrorCode.ERR_AssgReadonly, "field").WithLocation(12, 23),
// 0.cs(25,13): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// @field = null; // 3
Diagnostic(ErrorCode.ERR_AssgReadonly, "@field").WithLocation(25, 13),
// 0.cs(30,13): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// @field = null; // 4
Diagnostic(ErrorCode.ERR_AssgReadonly, "@field").WithLocation(30, 13),
// 0.cs(38,9): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// field = null; // 5
Diagnostic(ErrorCode.ERR_AssgReadonly, "field").WithLocation(38, 9),
// 0.cs(42,9): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// field = null; // 6
Diagnostic(ErrorCode.ERR_AssgReadonly, "field").WithLocation(42, 9),
// 0.cs(48,13): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// @field = null; // 7
Diagnostic(ErrorCode.ERR_AssgReadonly, "@field").WithLocation(48, 13)
);
}
[Fact]
public void ReadonlyFields_Evaluation()
{
string source = @"
public class C
{
public readonly int field;
public static void Main()
{
var c1 = new C();
System.Console.Write($""{c1.field} "");
var c2 = new C() { Property = 43 };
System.Console.Write($""{c2.field}"");
}
public C()
{
field = 42;
}
public int Property
{
init
{
@field = value;
}
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition },
options: TestOptions.DebugExe, parseOptions: TestOptions.Regular9);
comp.VerifyDiagnostics();
// PEVerify: [ : C::set_Property] Cannot change initonly field outside its .ctor.
CompileAndVerify(comp, expectedOutput: "42 43",
verify: Verification.FailsPEVerify);
}
[Fact]
public void ReadonlyFields_TypesDifferingNullability()
{
string source = @"
public class C
{
public static void Main()
{
System.Console.Write(C1<int>.F1.content);
System.Console.Write("" "");
System.Console.Write(C2<int>.F1.content);
}
}
public struct Container
{
public int content;
}
class C1<T>
{
public static readonly Container F1;
static C1()
{
C1<T>.F1.content = 2;
}
}
#nullable enable
class C2<T>
{
public static readonly Container F1;
static C2()
{
C2<T>.F1.content = 3;
}
}
";
var comp = CreateCompilation(source, parseOptions: TestOptions.Regular9, options: TestOptions.DebugExe);
comp.VerifyEmitDiagnostics();
var v = CompileAndVerify(comp, expectedOutput: "2 3", verify: Verification.Skipped);
// PEVerify bug
// [ : C::Main][mdToken=0x6000004][offset 0x00000001] Cannot change initonly field outside its .ctor.
v.VerifyIL("C.Main", @"
{
// Code size 45 (0x2d)
.maxstack 1
IL_0000: nop
IL_0001: ldsflda ""Container C1<int>.F1""
IL_0006: ldfld ""int Container.content""
IL_000b: call ""void System.Console.Write(int)""
IL_0010: nop
IL_0011: ldstr "" ""
IL_0016: call ""void System.Console.Write(string)""
IL_001b: nop
IL_001c: ldsflda ""Container C2<int>.F1""
IL_0021: ldfld ""int Container.content""
IL_0026: call ""void System.Console.Write(int)""
IL_002b: nop
IL_002c: ret
}
");
}
[Fact]
public void StaticReadonlyFieldInitializedByAnother()
{
string source = @"
public class C
{
public static readonly int field;
public static readonly int field2 = (field = 42);
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyDiagnostics();
}
[Fact]
public void ReadonlyFields_DisallowedOnOtherInstances()
{
string source = @"
public class C
{
public readonly string field;
public C c;
public C()
{
c.field = null; // 1
}
public string InitOnlyProperty
{
init
{
c.@field = null; // 2
}
}
}
public class Derived : C
{
Derived()
{
c.field = null; // 3
}
public string InitOnlyProperty2
{
init
{
c.@field = null; // 4
}
}
}
public class Caller
{
void M(C c)
{
_ = new C() {
field = // 5
(c.field = null) // 6
};
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// 0.cs(9,9): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// c.field = null; // 1
Diagnostic(ErrorCode.ERR_AssgReadonly, "c.field").WithLocation(9, 9),
// 0.cs(16,13): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// c.@field = null; // 2
Diagnostic(ErrorCode.ERR_AssgReadonly, "c.@field").WithLocation(16, 13),
// 0.cs(24,9): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// c.field = null; // 3
Diagnostic(ErrorCode.ERR_AssgReadonly, "c.field").WithLocation(24, 9),
// 0.cs(31,13): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// c.@field = null; // 4
Diagnostic(ErrorCode.ERR_AssgReadonly, "c.@field").WithLocation(31, 13),
// 0.cs(40,13): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// field = // 5
Diagnostic(ErrorCode.ERR_AssgReadonly, "field").WithLocation(40, 13),
// 0.cs(41,18): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// (c.field = null) // 6
Diagnostic(ErrorCode.ERR_AssgReadonly, "c.field").WithLocation(41, 18)
);
}
[Fact, WorkItem(45657, "https://github.com/dotnet/roslyn/issues/45657")]
public void ReadonlyFieldsMembers()
{
string source = @"
public struct Container
{
public string content;
}
public class C
{
public readonly Container field;
public C()
{
field.content = null;
}
public void M1()
{
field.content = null; // 1
}
public int InitOnlyProperty1
{
init
{
@field.content = null;
}
}
public int RegularProperty
{
get
{
@field.content = null; // 2
throw null;
}
set
{
@field.content = null; // 3
}
}
}
public class Derived : C
{
public Derived()
{
field.content = null; // 4
}
public void M2()
{
field.content = null; // 5
}
public int InitOnlyProperty2
{
init
{
@field.content = null; // 6
}
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// 0.cs(15,9): error CS1648: Members of readonly field 'C.field' cannot be modified (except in a constructor or a variable initializer)
// field.content = null; // 1
Diagnostic(ErrorCode.ERR_AssgReadonly2, "field.content").WithArguments("C.field").WithLocation(15, 9),
// 0.cs(28,13): error CS1648: Members of readonly field 'C.field' cannot be modified (except in a constructor or a variable initializer)
// @field.content = null; // 2
Diagnostic(ErrorCode.ERR_AssgReadonly2, "@field.content").WithArguments("C.field").WithLocation(28, 13),
// 0.cs(33,13): error CS1648: Members of readonly field 'C.field' cannot be modified (except in a constructor or a variable initializer)
// @field.content = null; // 3
Diagnostic(ErrorCode.ERR_AssgReadonly2, "@field.content").WithArguments("C.field").WithLocation(33, 13),
// 0.cs(41,9): error CS1648: Members of readonly field 'C.field' cannot be modified (except in a constructor or a variable initializer)
// field.content = null; // 4
Diagnostic(ErrorCode.ERR_AssgReadonly2, "field.content").WithArguments("C.field").WithLocation(41, 9),
// 0.cs(45,9): error CS1648: Members of readonly field 'C.field' cannot be modified (except in a constructor or a variable initializer)
// field.content = null; // 5
Diagnostic(ErrorCode.ERR_AssgReadonly2, "field.content").WithArguments("C.field").WithLocation(45, 9),
// 0.cs(51,13): error CS1648: Members of readonly field 'C.field' cannot be modified (except in a constructor or a variable initializer)
// @field.content = null; // 6
Diagnostic(ErrorCode.ERR_AssgReadonly2, "@field.content").WithArguments("C.field").WithLocation(51, 13)
);
}
[Fact, WorkItem(45657, "https://github.com/dotnet/roslyn/issues/45657")]
public void ReadonlyFieldsMembers_Evaluation()
{
string source = @"
public struct Container
{
public int content;
}
public class C
{
public readonly Container field;
public int InitOnlyProperty1
{
init
{
@field.content = value;
System.Console.Write(""RAN "");
}
}
public static void Main()
{
var c = new C() { InitOnlyProperty1 = 42 };
System.Console.Write(c.field.content);
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9, options: TestOptions.DebugExe);
comp.VerifyEmitDiagnostics();
CompileAndVerify(comp, expectedOutput: "RAN 42", verify: Verification.Skipped /* init-only */);
}
[Fact, WorkItem(45657, "https://github.com/dotnet/roslyn/issues/45657")]
public void ReadonlyFieldsMembers_Static()
{
string source = @"
public struct Container
{
public int content;
}
public static class C
{
public static readonly Container field;
public static int InitOnlyProperty1
{
init
{
@field.content = value;
}
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// 0.cs(13,9): error CS8856: The 'init' accessor is not valid on static members
// init
Diagnostic(ErrorCode.ERR_BadInitAccessor, "init").WithLocation(13, 9),
// 0.cs(15,13): error CS1650: Fields of static readonly field 'C.field' cannot be assigned to (except in a static constructor or a variable initializer)
// @field.content = value;
Diagnostic(ErrorCode.ERR_AssgReadonlyStatic2, "@field.content").WithArguments("C.field").WithLocation(15, 13)
);
}
[Theory]
[InlineData(true)]
[InlineData(false)]
public void ReadonlyFields_Metadata(bool emitAsImage)
{
string lib_cs = @"
public class C
{
public readonly string field;
}
";
var libComp = CreateCompilation(new[] { lib_cs, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
string source = @"
public class Derived : C
{
public Derived()
{
field = null; // 1
_ = new C() { field = null }; // 2
}
public void M2()
{
field = null; // 3
_ = new C() { field = null }; // 4
}
public int InitOnlyProperty2
{
init
{
@field = null; // 5
}
}
}
";
var comp = CreateCompilation(source,
references: new[] { emitAsImage ? libComp.EmitToImageReference() : libComp.ToMetadataReference() },
parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (6,9): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// field = null; // 1
Diagnostic(ErrorCode.ERR_AssgReadonly, "field").WithLocation(6, 9),
// (7,23): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// _ = new C() { field = null }; // 2
Diagnostic(ErrorCode.ERR_AssgReadonly, "field").WithLocation(7, 23),
// (12,9): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// field = null; // 3
Diagnostic(ErrorCode.ERR_AssgReadonly, "field").WithLocation(12, 9),
// (13,23): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// _ = new C() { field = null }; // 4
Diagnostic(ErrorCode.ERR_AssgReadonly, "field").WithLocation(13, 23),
// (20,13): error CS0191: A readonly field cannot be assigned to (except in a constructor or init-only setter of the type in which the field is defined or a variable initializer)
// @field = null; // 5
Diagnostic(ErrorCode.ERR_AssgReadonly, "@field").WithLocation(20, 13)
);
}
[Fact]
public void TestGetSpeculativeSemanticModelForPropertyAccessorBody()
{
var compilation = CreateCompilation(@"
class R
{
private int _p;
}
class C : R
{
private int M
{
init
{
int y = 1000;
}
}
}
");
var blockStatement = (BlockSyntax)SyntaxFactory.ParseStatement(@"
{
int z = 0;
_p = 123L;
}
");
var tree = compilation.SyntaxTrees[0];
var root = tree.GetCompilationUnitRoot();
var model = compilation.GetSemanticModel(tree, ignoreAccessibility: true);
AccessorDeclarationSyntax accessorDecl = root.DescendantNodes().OfType<AccessorDeclarationSyntax>().Single();
var speculatedMethod = accessorDecl.ReplaceNode(accessorDecl.Body, blockStatement);
SemanticModel speculativeModel;
var success =
model.TryGetSpeculativeSemanticModelForMethodBody(
accessorDecl.Body.Statements[0].SpanStart, speculatedMethod, out speculativeModel);
Assert.True(success);
Assert.NotNull(speculativeModel);
var p =
speculativeModel.SyntaxTree.GetRoot()
.DescendantNodes()
.OfType<IdentifierNameSyntax>()
.Single(s => s.Identifier.ValueText == "_p");
var symbolSpeculation =
speculativeModel.GetSpeculativeSymbolInfo(p.FullSpan.Start, p, SpeculativeBindingOption.BindAsExpression);
Assert.Equal("_p", symbolSpeculation.Symbol.Name);
var typeSpeculation =
speculativeModel.GetSpeculativeTypeInfo(p.FullSpan.Start, p, SpeculativeBindingOption.BindAsExpression);
Assert.Equal("Int32", typeSpeculation.Type.Name);
}
[Fact]
public void BlockBodyAndExpressionBody_14()
{
var comp = CreateCompilation(new[] { @"
public class C
{
static int P1 { get; set; }
int P2
{
init { P1 = 1; } => P1 = 1;
}
}
", IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (7,9): error CS8057: Block bodies and expression bodies cannot both be provided.
// init { P1 = 1; } => P1 = 1;
Diagnostic(ErrorCode.ERR_BlockBodyAndExpressionBody, "init { P1 = 1; } => P1 = 1;").WithLocation(7, 9)
);
var tree = comp.SyntaxTrees[0];
var model = comp.GetSemanticModel(tree);
var nodes = tree.GetRoot().DescendantNodes().OfType<AssignmentExpressionSyntax>();
Assert.Equal(2, nodes.Count());
foreach (var assign in nodes)
{
var node = assign.Left;
Assert.Equal("P1", node.ToString());
Assert.Equal("System.Int32 C.P1 { get; set; }", model.GetSymbolInfo(node).Symbol.ToTestDisplayString());
}
}
[Fact]
public void ModReqOnSetAccessorParameter()
{
string il = @"
.class public auto ansi beforefieldinit C extends System.Object
{
.method public hidebysig specialname newslot virtual instance void set_Property ( int32 modreq(System.Runtime.CompilerServices.IsExternalInit) 'value' ) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.property instance int32 Property()
{
.set instance void C::set_Property(int32 modreq(System.Runtime.CompilerServices.IsExternalInit))
}
}
.class public auto ansi sealed beforefieldinit System.Runtime.CompilerServices.IsExternalInit extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
";
string source = @"
public class Derived : C
{
public override int Property { set { throw null; } }
}
public class Derived2 : C
{
public override int Property { init { throw null; } }
}
public class D
{
void M(C c)
{
c.Property = 42;
c.set_Property(42);
}
}
";
var reference = CreateMetadataReferenceFromIlSource(il);
var comp = CreateCompilation(source, references: new[] { reference }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,36): error CS0570: 'C.Property.set' is not supported by the language
// public override int Property { set { throw null; } }
Diagnostic(ErrorCode.ERR_BindToBogus, "set").WithArguments("C.Property.set").WithLocation(4, 36),
// (8,25): error CS8853: 'Derived2.Property' must match by init-only of overridden member 'C.Property'
// public override int Property { init { throw null; } }
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "Property").WithArguments("Derived2.Property", "C.Property").WithLocation(8, 25),
// (8,36): error CS0570: 'C.Property.set' is not supported by the language
// public override int Property { init { throw null; } }
Diagnostic(ErrorCode.ERR_BindToBogus, "init").WithArguments("C.Property.set").WithLocation(8, 36),
// (14,11): error CS0570: 'C.Property.set' is not supported by the language
// c.Property = 42;
Diagnostic(ErrorCode.ERR_BindToBogus, "Property").WithArguments("C.Property.set").WithLocation(14, 11),
// (15,11): error CS0571: 'C.Property.set': cannot explicitly call operator or accessor
// c.set_Property(42);
Diagnostic(ErrorCode.ERR_CantCallSpecialMethod, "set_Property").WithArguments("C.Property.set").WithLocation(15, 11)
);
var property0 = (PEPropertySymbol)comp.GlobalNamespace.GetMember("C.Property");
Assert.Null(property0.GetMethod);
Assert.False(property0.MustCallMethodsDirectly);
Assert.True(property0.SetMethod.HasUseSiteError);
Assert.True(property0.SetMethod.HasUnsupportedMetadata);
Assert.True(property0.SetMethod.Parameters[0].HasUnsupportedMetadata);
var property1 = (PropertySymbol)comp.GlobalNamespace.GetMember("Derived.Property");
Assert.Null(property1.GetMethod);
Assert.False(property1.SetMethod.HasUseSiteError);
Assert.False(property1.SetMethod.Parameters[0].Type.IsErrorType());
var property2 = (PropertySymbol)comp.GlobalNamespace.GetMember("Derived2.Property");
Assert.Null(property2.GetMethod);
Assert.False(property2.SetMethod.HasUseSiteError);
Assert.False(property2.SetMethod.Parameters[0].Type.IsErrorType());
}
[Fact]
public void ModReqOnSetAccessorParameter_AndProperty()
{
string il = @"
.class public auto ansi beforefieldinit C extends System.Object
{
.method public hidebysig specialname newslot virtual instance void set_Property ( int32 modreq(System.Runtime.CompilerServices.IsExternalInit) 'value' ) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.property instance int32 modreq(System.Runtime.CompilerServices.IsExternalInit) Property()
{
.set instance void C::set_Property(int32 modreq(System.Runtime.CompilerServices.IsExternalInit))
}
}
.class public auto ansi sealed beforefieldinit System.Runtime.CompilerServices.IsExternalInit extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
";
string source = @"
public class Derived : C
{
public override int Property { set { throw null; } }
}
public class Derived2 : C
{
public override int Property { init { throw null; } }
}
public class D
{
void M(C c)
{
c.Property = 42;
c.set_Property(42);
}
}
";
var reference = CreateMetadataReferenceFromIlSource(il);
var comp = CreateCompilation(source, references: new[] { reference }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,25): error CS0569: 'Derived.Property': cannot override 'C.Property' because it is not supported by the language
// public override int Property { set { throw null; } }
Diagnostic(ErrorCode.ERR_CantOverrideBogusMethod, "Property").WithArguments("Derived.Property", "C.Property").WithLocation(4, 25),
// (8,25): error CS0569: 'Derived2.Property': cannot override 'C.Property' because it is not supported by the language
// public override int Property { init { throw null; } }
Diagnostic(ErrorCode.ERR_CantOverrideBogusMethod, "Property").WithArguments("Derived2.Property", "C.Property").WithLocation(8, 25),
// (14,11): error CS1546: Property, indexer, or event 'C.Property' is not supported by the language; try directly calling accessor method 'C.set_Property(int)'
// c.Property = 42;
Diagnostic(ErrorCode.ERR_BindToBogusProp1, "Property").WithArguments("C.Property", "C.set_Property(int)").WithLocation(14, 11),
// (15,11): error CS0570: 'C.set_Property(int)' is not supported by the language
// c.set_Property(42);
Diagnostic(ErrorCode.ERR_BindToBogus, "set_Property").WithArguments("C.set_Property(int)").WithLocation(15, 11)
);
var property0 = (PEPropertySymbol)comp.GlobalNamespace.GetMember("C.Property");
Assert.True(property0.HasUseSiteError);
Assert.True(property0.HasUnsupportedMetadata);
Assert.True(property0.MustCallMethodsDirectly);
Assert.Equal("System.Int32", property0.Type.ToTestDisplayString());
Assert.Null(property0.GetMethod);
Assert.True(property0.SetMethod.HasUseSiteError);
Assert.True(property0.SetMethod.HasUnsupportedMetadata);
Assert.True(property0.SetMethod.Parameters[0].HasUnsupportedMetadata);
var property1 = (PropertySymbol)comp.GlobalNamespace.GetMember("Derived.Property");
Assert.False(property1.HasUseSiteError);
Assert.Null(property1.GetMethod);
Assert.False(property1.SetMethod.HasUseSiteError);
Assert.False(property1.SetMethod.Parameters[0].Type.IsErrorType());
var property2 = (PropertySymbol)comp.GlobalNamespace.GetMember("Derived2.Property");
Assert.False(property2.HasUseSiteError);
Assert.Null(property2.GetMethod);
Assert.False(property2.SetMethod.HasUseSiteError);
Assert.False(property2.SetMethod.Parameters[0].Type.IsErrorType());
}
[Fact]
public void ModReqOnSetAccessorParameter_IndexerParameter()
{
string il = @"
.class public auto ansi beforefieldinit C extends System.Object
{
.custom instance void System.Reflection.DefaultMemberAttribute::.ctor(string) = ( 01 00 04 49 74 65 6d 00 00 )
.method public hidebysig specialname newslot virtual instance void set_Item ( int32 modreq(System.Runtime.CompilerServices.IsExternalInit) i, int32 'value' ) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.property instance int32 Item(int32 modreq(System.Runtime.CompilerServices.IsExternalInit) i)
{
.set instance void C::set_Item(int32 modreq(System.Runtime.CompilerServices.IsExternalInit), int32)
}
}
.class public auto ansi sealed beforefieldinit System.Runtime.CompilerServices.IsExternalInit extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
.class public auto ansi sealed beforefieldinit System.Reflection.DefaultMemberAttribute extends System.Attribute
{
.method public hidebysig specialname rtspecialname instance void .ctor ( string memberName ) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
.class public auto ansi sealed beforefieldinit System.Attribute extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
";
string source = @"
public class Derived : C
{
public override int this[int i] { set { throw null; } }
}
public class Derived2 : C
{
public override int this[int i] { init { throw null; } }
}
public class D
{
void M(C c)
{
c[42] = 43;
c.set_Item(42, 43);
}
}
";
var reference = CreateMetadataReferenceFromIlSource(il);
var comp = CreateCompilation(source, references: new[] { reference }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,25): error CS0569: 'Derived.this[int]': cannot override 'C.this[int]' because it is not supported by the language
// public override int this[int i] { set { throw null; } }
Diagnostic(ErrorCode.ERR_CantOverrideBogusMethod, "this").WithArguments("Derived.this[int]", "C.this[int]").WithLocation(4, 25),
// (8,25): error CS0569: 'Derived2.this[int]': cannot override 'C.this[int]' because it is not supported by the language
// public override int this[int i] { init { throw null; } }
Diagnostic(ErrorCode.ERR_CantOverrideBogusMethod, "this").WithArguments("Derived2.this[int]", "C.this[int]").WithLocation(8, 25),
// (14,9): error CS1546: Property, indexer, or event 'C.this[int]' is not supported by the language; try directly calling accessor method 'C.set_Item(int, int)'
// c[42] = 43;
Diagnostic(ErrorCode.ERR_BindToBogusProp1, "c[42]").WithArguments("C.this[int]", "C.set_Item(int, int)").WithLocation(14, 9),
// (15,11): error CS0570: 'C.set_Item(int, int)' is not supported by the language
// c.set_Item(42, 43);
Diagnostic(ErrorCode.ERR_BindToBogus, "set_Item").WithArguments("C.set_Item(int, int)").WithLocation(15, 11)
);
var property0 = (PEPropertySymbol)comp.GlobalNamespace.GetMember("C.this[]");
Assert.True(property0.HasUseSiteError);
Assert.True(property0.MustCallMethodsDirectly);
Assert.Null(property0.GetMethod);
Assert.True(property0.SetMethod.HasUseSiteError);
Assert.True(property0.SetMethod.HasUnsupportedMetadata);
Assert.True(property0.SetMethod.Parameters[0].HasUnsupportedMetadata);
}
[Fact]
public void ModReqOnIndexerValue()
{
string il = @"
.class public auto ansi beforefieldinit C extends System.Object
{
.custom instance void System.Reflection.DefaultMemberAttribute::.ctor(string) = ( 01 00 04 49 74 65 6d 00 00 )
.method public hidebysig specialname newslot virtual instance void set_Item ( int32 i, int32 modreq(System.Runtime.CompilerServices.IsExternalInit) 'value' ) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.property instance int32 Item(int32 i)
{
.set instance void C::set_Item(int32, int32 modreq(System.Runtime.CompilerServices.IsExternalInit))
}
}
.class public auto ansi sealed beforefieldinit System.Runtime.CompilerServices.IsExternalInit extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
.class public auto ansi sealed beforefieldinit System.Reflection.DefaultMemberAttribute extends System.Attribute
{
.method public hidebysig specialname rtspecialname instance void .ctor ( string memberName ) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
.class public auto ansi sealed beforefieldinit System.Attribute extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
";
string source = @"
public class Derived : C
{
public override int this[int i] { set { throw null; } }
}
public class Derived2 : C
{
public override int this[int i] { init { throw null; } }
}
";
var reference = CreateMetadataReferenceFromIlSource(il);
var comp = CreateCompilation(source, references: new[] { reference }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,39): error CS0570: 'C.this[int].set' is not supported by the language
// public override int this[int i] { set { throw null; } }
Diagnostic(ErrorCode.ERR_BindToBogus, "set").WithArguments("C.this[int].set").WithLocation(4, 39),
// (8,25): error CS8853: 'Derived2.this[int]' must match by init-only of overridden member 'C.this[int]'
// public override int this[int i] { init { throw null; } }
Diagnostic(ErrorCode.ERR_CantChangeInitOnlyOnOverride, "this").WithArguments("Derived2.this[int]", "C.this[int]").WithLocation(8, 25),
// (8,39): error CS0570: 'C.this[int].set' is not supported by the language
// public override int this[int i] { init { throw null; } }
Diagnostic(ErrorCode.ERR_BindToBogus, "init").WithArguments("C.this[int].set").WithLocation(8, 39)
);
var property0 = (PEPropertySymbol)comp.GlobalNamespace.GetMember("C.this[]");
Assert.False(property0.HasUseSiteError);
Assert.False(property0.MustCallMethodsDirectly);
Assert.Null(property0.GetMethod);
Assert.True(property0.SetMethod.HasUseSiteError);
Assert.True(property0.SetMethod.HasUnsupportedMetadata);
Assert.True(property0.SetMethod.Parameters[1].HasUnsupportedMetadata);
}
[Fact]
public void ModReqOnStaticMethod()
{
string il = @"
.class public auto ansi beforefieldinit C extends System.Object
{
.method public hidebysig static void modreq(System.Runtime.CompilerServices.IsExternalInit) M () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
.class public auto ansi sealed beforefieldinit System.Runtime.CompilerServices.IsExternalInit extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
";
string source = @"
public class D
{
void M2()
{
C.M();
}
}
";
var reference = CreateMetadataReferenceFromIlSource(il);
var comp = CreateCompilation(source, references: new[] { reference }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (6,11): error CS0570: 'C.M()' is not supported by the language
// C.M();
Diagnostic(ErrorCode.ERR_BindToBogus, "M").WithArguments("C.M()").WithLocation(6, 11)
);
var method = (PEMethodSymbol)comp.GlobalNamespace.GetMember("C.M");
Assert.False(method.IsInitOnly);
Assert.False(method.GetPublicSymbol().IsInitOnly);
Assert.True(method.HasUseSiteError);
Assert.True(method.HasUnsupportedMetadata);
}
[Fact]
public void ModReqOnStaticSet()
{
string il = @"
.class public auto ansi beforefieldinit C extends System.Object
{
.method public hidebysig newslot specialname
static void modreq(System.Runtime.CompilerServices.IsExternalInit) set_P(int32 x) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.property instance int32 P()
{
.set void modreq(System.Runtime.CompilerServices.IsExternalInit) C::set_P(int32)
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
.class public auto ansi sealed beforefieldinit System.Runtime.CompilerServices.IsExternalInit extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
";
string source = @"
public class D
{
void M2()
{
C.P = 2;
}
}
";
var reference = CreateMetadataReferenceFromIlSource(il);
var comp = CreateCompilation(source, references: new[] { reference }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (6,11): error CS0570: 'C.P.set' is not supported by the language
// C.P = 2;
Diagnostic(ErrorCode.ERR_BindToBogus, "P").WithArguments("C.P.set").WithLocation(6, 11)
);
var method = (PEMethodSymbol)comp.GlobalNamespace.GetMember("C.set_P");
Assert.False(method.IsInitOnly);
Assert.False(method.GetPublicSymbol().IsInitOnly);
Assert.True(method.HasUseSiteError);
Assert.True(method.HasUnsupportedMetadata);
}
[Fact]
public void ModReqOnMethodParameter()
{
string il = @"
.class public auto ansi beforefieldinit C extends System.Object
{
.method public hidebysig newslot virtual instance void M ( int32 modreq(System.Runtime.CompilerServices.IsExternalInit) i ) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
.class public auto ansi sealed beforefieldinit System.Runtime.CompilerServices.IsExternalInit extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
";
string source = @"
public class Derived : C
{
public override void M() { }
}
";
var reference = CreateMetadataReferenceFromIlSource(il);
var comp = CreateCompilation(source, references: new[] { reference }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,26): error CS0115: 'Derived.M()': no suitable method found to override
// public override void M() { }
Diagnostic(ErrorCode.ERR_OverrideNotExpected, "M").WithArguments("Derived.M()").WithLocation(4, 26)
);
var method0 = (PEMethodSymbol)comp.GlobalNamespace.GetMember("C.M");
Assert.True(method0.HasUseSiteError);
Assert.True(method0.HasUnsupportedMetadata);
Assert.True(method0.Parameters[0].HasUnsupportedMetadata);
}
[Fact]
public void ModReqOnInitOnlySetterOfRefProperty()
{
string il = @"
.class public auto ansi beforefieldinit C extends System.Object
{
.method public hidebysig specialname newslot virtual instance int32& get_Property () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname newslot virtual instance void set_Property ( int32& modreq(System.Runtime.CompilerServices.IsExternalInit) 'value' ) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.property instance int32& Property()
{
.get instance int32& C::get_Property()
.set instance void C::set_Property(int32& modreq(System.Runtime.CompilerServices.IsExternalInit))
}
}
.class public auto ansi sealed beforefieldinit System.Runtime.CompilerServices.IsExternalInit extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
";
string source = @"
public class D
{
void M(C c, ref int i)
{
_ = c.get_Property();
c.set_Property(i); // 1
_ = c.Property; // 2
c.Property = i; // 3
}
}
";
var reference = CreateMetadataReferenceFromIlSource(il);
var comp = CreateCompilation(source, references: new[] { reference }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (7,11): error CS0570: 'C.set_Property(ref int)' is not supported by the language
// c.set_Property(i); // 1
Diagnostic(ErrorCode.ERR_BindToBogus, "set_Property").WithArguments("C.set_Property(ref int)").WithLocation(7, 11),
// (9,15): error CS1545: Property, indexer, or event 'C.Property' is not supported by the language; try directly calling accessor methods 'C.get_Property()' or 'C.set_Property(ref int)'
// _ = c.Property; // 2
Diagnostic(ErrorCode.ERR_BindToBogusProp2, "Property").WithArguments("C.Property", "C.get_Property()", "C.set_Property(ref int)").WithLocation(9, 15),
// (10,11): error CS1545: Property, indexer, or event 'C.Property' is not supported by the language; try directly calling accessor methods 'C.get_Property()' or 'C.set_Property(ref int)'
// c.Property = i; // 3
Diagnostic(ErrorCode.ERR_BindToBogusProp2, "Property").WithArguments("C.Property", "C.get_Property()", "C.set_Property(ref int)").WithLocation(10, 11)
);
var property0 = (PEPropertySymbol)comp.GlobalNamespace.GetMember("C.Property");
Assert.False(property0.HasUseSiteError);
Assert.True(property0.MustCallMethodsDirectly);
Assert.False(property0.GetMethod.HasUseSiteError);
Assert.True(property0.SetMethod.HasUseSiteError);
Assert.True(property0.SetMethod.Parameters[0].HasUnsupportedMetadata);
Assert.False(property0.SetMethod.IsInitOnly);
Assert.False(property0.GetPublicSymbol().SetMethod.IsInitOnly);
}
[Fact]
public void ModReqOnRefProperty_OnRefReturn()
{
string il = @"
.class public auto ansi beforefieldinit C extends System.Object
{
.method public hidebysig specialname newslot virtual instance int32& modreq(System.Runtime.CompilerServices.IsExternalInit) get_Property () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname newslot virtual instance void set_Property ( int32& modreq(System.Runtime.CompilerServices.IsExternalInit) 'value' ) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.property instance int32& modreq(System.Runtime.CompilerServices.IsExternalInit) Property()
{
.get instance int32& modreq(System.Runtime.CompilerServices.IsExternalInit) C::get_Property()
.set instance void C::set_Property(int32& modreq(System.Runtime.CompilerServices.IsExternalInit))
}
}
.class public auto ansi sealed beforefieldinit System.Runtime.CompilerServices.IsExternalInit extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
";
string source = @"
public class D
{
void M(C c, ref int i)
{
_ = c.get_Property(); // 1
c.set_Property(i); // 2
_ = c.Property; // 3
c.Property = i; // 4
}
}
";
var reference = CreateMetadataReferenceFromIlSource(il);
var comp = CreateCompilation(source, references: new[] { reference }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (6,15): error CS0570: 'C.get_Property()' is not supported by the language
// _ = c.get_Property(); // 1
Diagnostic(ErrorCode.ERR_BindToBogus, "get_Property").WithArguments("C.get_Property()").WithLocation(6, 15),
// (7,11): error CS0570: 'C.set_Property(ref int)' is not supported by the language
// c.set_Property(i); // 2
Diagnostic(ErrorCode.ERR_BindToBogus, "set_Property").WithArguments("C.set_Property(ref int)").WithLocation(7, 11),
// (9,15): error CS1545: Property, indexer, or event 'C.Property' is not supported by the language; try directly calling accessor methods 'C.get_Property()' or 'C.set_Property(ref int)'
// _ = c.Property; // 3
Diagnostic(ErrorCode.ERR_BindToBogusProp2, "Property").WithArguments("C.Property", "C.get_Property()", "C.set_Property(ref int)").WithLocation(9, 15),
// (10,11): error CS1545: Property, indexer, or event 'C.Property' is not supported by the language; try directly calling accessor methods 'C.get_Property()' or 'C.set_Property(ref int)'
// c.Property = i; // 4
Diagnostic(ErrorCode.ERR_BindToBogusProp2, "Property").WithArguments("C.Property", "C.get_Property()", "C.set_Property(ref int)").WithLocation(10, 11)
);
var property0 = (PEPropertySymbol)comp.GlobalNamespace.GetMember("C.Property");
Assert.True(property0.HasUseSiteError);
Assert.True(property0.MustCallMethodsDirectly);
Assert.Equal("System.Runtime.CompilerServices.IsExternalInit", property0.RefCustomModifiers.Single().Modifier.ToTestDisplayString());
Assert.Empty(property0.TypeWithAnnotations.CustomModifiers);
Assert.True(property0.GetMethod.HasUseSiteError);
Assert.True(property0.GetMethod.HasUnsupportedMetadata);
Assert.True(property0.GetMethod.ReturnsByRef);
Assert.True(property0.SetMethod.HasUseSiteError);
Assert.True(property0.SetMethod.HasUnsupportedMetadata);
Assert.True(property0.SetMethod.Parameters[0].HasUnsupportedMetadata);
Assert.False(property0.SetMethod.IsInitOnly);
Assert.False(property0.GetPublicSymbol().SetMethod.IsInitOnly);
}
[Fact]
public void ModReqOnRefProperty_OnReturn()
{
string il = @"
.class public auto ansi beforefieldinit C extends System.Object
{
.method public hidebysig specialname newslot virtual instance int32 modreq(System.Runtime.CompilerServices.IsExternalInit)& get_Property () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname newslot virtual instance void set_Property ( int32 modreq(System.Runtime.CompilerServices.IsExternalInit)& 'value' ) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.property instance int32 modreq(System.Runtime.CompilerServices.IsExternalInit)& Property()
{
.get instance int32 modreq(System.Runtime.CompilerServices.IsExternalInit)& C::get_Property()
.set instance void C::set_Property(int32 modreq(System.Runtime.CompilerServices.IsExternalInit)&)
}
}
.class public auto ansi sealed beforefieldinit System.Runtime.CompilerServices.IsExternalInit extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
";
string source = @"
public class D
{
void M(C c, ref int i)
{
_ = c.get_Property(); // 1
c.set_Property(i); // 2
_ = c.Property; // 3
c.Property = i; // 4
}
}
";
var reference = CreateMetadataReferenceFromIlSource(il);
var comp = CreateCompilation(source, references: new[] { reference }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (6,15): error CS0570: 'C.get_Property()' is not supported by the language
// _ = c.get_Property(); // 1
Diagnostic(ErrorCode.ERR_BindToBogus, "get_Property").WithArguments("C.get_Property()").WithLocation(6, 15),
// (7,11): error CS0570: 'C.set_Property(ref int)' is not supported by the language
// c.set_Property(i); // 2
Diagnostic(ErrorCode.ERR_BindToBogus, "set_Property").WithArguments("C.set_Property(ref int)").WithLocation(7, 11),
// (9,15): error CS1545: Property, indexer, or event 'C.Property' is not supported by the language; try directly calling accessor methods 'C.get_Property()' or 'C.set_Property(ref int)'
// _ = c.Property; // 3
Diagnostic(ErrorCode.ERR_BindToBogusProp2, "Property").WithArguments("C.Property", "C.get_Property()", "C.set_Property(ref int)").WithLocation(9, 15),
// (10,11): error CS1545: Property, indexer, or event 'C.Property' is not supported by the language; try directly calling accessor methods 'C.get_Property()' or 'C.set_Property(ref int)'
// c.Property = i; // 4
Diagnostic(ErrorCode.ERR_BindToBogusProp2, "Property").WithArguments("C.Property", "C.get_Property()", "C.set_Property(ref int)").WithLocation(10, 11)
);
var property0 = (PEPropertySymbol)comp.GlobalNamespace.GetMember("C.Property");
Assert.True(property0.HasUseSiteError);
Assert.True(property0.MustCallMethodsDirectly);
Assert.Empty(property0.RefCustomModifiers);
Assert.Equal("System.Runtime.CompilerServices.IsExternalInit", property0.TypeWithAnnotations.CustomModifiers.Single().Modifier.ToTestDisplayString());
Assert.Equal("System.Int32", property0.TypeWithAnnotations.Type.ToTestDisplayString());
Assert.True(property0.GetMethod.HasUseSiteError);
Assert.True(property0.GetMethod.HasUnsupportedMetadata);
Assert.True(property0.GetMethod.ReturnsByRef);
Assert.True(property0.SetMethod.HasUseSiteError);
Assert.True(property0.SetMethod.HasUnsupportedMetadata);
Assert.True(property0.SetMethod.Parameters[0].HasUnsupportedMetadata);
Assert.False(property0.SetMethod.IsInitOnly);
Assert.False(property0.GetPublicSymbol().SetMethod.IsInitOnly);
}
[Fact]
public void ModReqOnGetAccessorReturnValue()
{
string il = @"
.class public auto ansi beforefieldinit C extends System.Object
{
.method public hidebysig specialname newslot virtual instance int32 modreq(System.Runtime.CompilerServices.IsExternalInit) get_Property () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname newslot virtual instance void set_Property ( int32 'value' ) cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
.property instance int32 Property()
{
.get instance int32 modreq(System.Runtime.CompilerServices.IsExternalInit) C::get_Property()
.set instance void C::set_Property(int32)
}
}
.class public auto ansi sealed beforefieldinit System.Runtime.CompilerServices.IsExternalInit extends System.Object
{
.method public hidebysig specialname rtspecialname instance void .ctor () cil managed
{
IL_0000: ldnull
IL_0001: throw
}
}
";
string source = @"
public class Derived : C
{
public override int Property { get { throw null; } }
}
";
var reference = CreateMetadataReferenceFromIlSource(il);
var comp = CreateCompilation(source, references: new[] { reference }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (4,36): error CS0570: 'C.Property.get' is not supported by the language
// public override int Property { get { throw null; } }
Diagnostic(ErrorCode.ERR_BindToBogus, "get").WithArguments("C.Property.get").WithLocation(4, 36)
);
var property = (PEPropertySymbol)comp.GlobalNamespace.GetMember("C.Property");
Assert.False(property.GetMethod.IsInitOnly);
Assert.False(property.GetPublicSymbol().GetMethod.IsInitOnly);
Assert.True(property.GetMethod.HasUseSiteError);
Assert.True(property.GetMethod.HasUnsupportedMetadata);
Assert.False(property.SetMethod.IsInitOnly);
Assert.False(property.GetPublicSymbol().SetMethod.IsInitOnly);
Assert.False(property.SetMethod.HasUseSiteError);
}
[Fact]
public void TestSyntaxFacts()
{
Assert.True(SyntaxFacts.IsAccessorDeclaration(SyntaxKind.InitAccessorDeclaration));
Assert.True(SyntaxFacts.IsAccessorDeclarationKeyword(SyntaxKind.InitKeyword));
}
[Fact]
public void NoCascadingErrorsInStaticConstructor()
{
string source = @"
public class C
{
public string Property { get { throw null; } init { throw null; } }
static C()
{
Property = null; // 1
this.Property = null; // 2
}
}
public class D : C
{
static D()
{
Property = null; // 3
this.Property = null; // 4
base.Property = null; // 5
}
}
";
var comp = CreateCompilation(new[] { source, IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics(
// (7,9): error CS0120: An object reference is required for the non-static field, method, or property 'C.Property'
// Property = null; // 1
Diagnostic(ErrorCode.ERR_ObjectRequired, "Property").WithArguments("C.Property").WithLocation(7, 9),
// (8,9): error CS0026: Keyword 'this' is not valid in a static property, static method, or static field initializer
// this.Property = null; // 2
Diagnostic(ErrorCode.ERR_ThisInStaticMeth, "this").WithLocation(8, 9),
// (15,9): error CS0120: An object reference is required for the non-static field, method, or property 'C.Property'
// Property = null; // 3
Diagnostic(ErrorCode.ERR_ObjectRequired, "Property").WithArguments("C.Property").WithLocation(15, 9),
// (16,9): error CS0026: Keyword 'this' is not valid in a static property, static method, or static field initializer
// this.Property = null; // 4
Diagnostic(ErrorCode.ERR_ThisInStaticMeth, "this").WithLocation(16, 9),
// (17,9): error CS1511: Keyword 'base' is not available in a static method
// base.Property = null; // 5
Diagnostic(ErrorCode.ERR_BaseInStaticMeth, "base").WithLocation(17, 9)
);
}
[Fact]
public void LocalFunctionsAreNotInitOnly()
{
var comp = CreateCompilation(new[] { @"
public class C
{
delegate void Delegate();
void M()
{
local();
void local() { }
}
}
", IsExternalInitTypeDefinition }, parseOptions: TestOptions.Regular9);
comp.VerifyEmitDiagnostics();
var tree = comp.SyntaxTrees[0];
var model = comp.GetSemanticModel(tree);
var localFunctionSyntax = tree.GetRoot().DescendantNodes().OfType<LocalFunctionStatementSyntax>().Single();
var localFunctionSymbol = model.GetDeclaredSymbol(localFunctionSyntax).GetSymbol<LocalFunctionSymbol>();
Assert.False(localFunctionSymbol.IsInitOnly);
Assert.False(localFunctionSymbol.GetPublicSymbol().IsInitOnly);
var delegateSyntax = tree.GetRoot().DescendantNodes().OfType<DelegateDeclarationSyntax>().Single();
var delegateMemberSymbols = model.GetDeclaredSymbol(delegateSyntax).GetSymbol<SourceNamedTypeSymbol>().GetMembers();
Assert.True(delegateMemberSymbols.All(m => m is SourceDelegateMethodSymbol));
foreach (var member in delegateMemberSymbols)
{
if (member is MethodSymbol method)
{
Assert.False(method.IsInitOnly);
Assert.False(method.GetPublicSymbol().IsInitOnly);
}
}
}
[Fact]
public void RetargetProperties_WithInitOnlySetter()
{
var source0 = @"
public struct S
{
public int Property { get; init; }
}
";
var source1 = @"
class Program
{
public static void Main()
{
var s = new S() { Property = 42 };
System.Console.WriteLine(s.Property);
}
}
";
var source2 = @"
class Program
{
public static void Main()
{
var s = new S() { Property = 43 };
System.Console.WriteLine(s.Property);
}
}
";
var comp1 = CreateCompilation(new[] { source0, source1, IsExternalInitTypeDefinition },
targetFramework: TargetFramework.Mscorlib40, options: TestOptions.DebugExe, parseOptions: TestOptions.Regular9);
// PEVerify: [ : S::set_Property] Cannot change initonly field outside its .ctor.
CompileAndVerify(comp1, expectedOutput: "42",
verify: Verification.FailsPEVerify);
var comp1Ref = new[] { comp1.ToMetadataReference() };
var comp7 = CreateCompilation(source2, references: comp1Ref,
targetFramework: TargetFramework.Mscorlib46, options: TestOptions.DebugExe, parseOptions: TestOptions.Regular9);
CompileAndVerify(comp7, expectedOutput: "43");
var property = comp7.GetMember<PropertySymbol>("S.Property");
var setter = (RetargetingMethodSymbol)property.SetMethod;
Assert.True(setter.IsInitOnly);
}
[Fact]
[WorkItem(47612, "https://github.com/dotnet/roslyn/issues/47612")]
public void InitOnlyOnReadonlyStruct_AutoProp()
{
var verifier = CompileAndVerify(new[] { IsExternalInitTypeDefinition, @"
var s = new S { I = 1 };
System.Console.Write(s.I);
public readonly struct S
{
public int I { get; init; }
}
" }, verify: Verification.FailsPEVerify, expectedOutput: "1");
verifier.VerifyIL("<top-level-statements-entry-point>", @"
{
// Code size 31 (0x1f)
.maxstack 2
.locals init (S V_0, //s
S V_1)
IL_0000: ldloca.s V_1
IL_0002: initobj ""S""
IL_0008: ldloca.s V_1
IL_000a: ldc.i4.1
IL_000b: call ""void S.I.init""
IL_0010: ldloc.1
IL_0011: stloc.0
IL_0012: ldloca.s V_0
IL_0014: call ""int S.I.get""
IL_0019: call ""void System.Console.Write(int)""
IL_001e: ret
}
");
}
[Fact]
[WorkItem(47612, "https://github.com/dotnet/roslyn/issues/47612")]
public void InitOnlyOnReadonlyStruct_ManualProp()
{
var verifier = CompileAndVerify(new[] { IsExternalInitTypeDefinition, @"
var s = new S { I = 1 };
System.Console.Write(s.I);
public readonly struct S
{
private readonly int i;
public int I { get => i; init => i = value; }
}
" }, verify: Verification.FailsPEVerify, expectedOutput: "1");
var s = verifier.Compilation.GetTypeByMetadataName("S");
var i = s.GetMember<IPropertySymbol>("I");
Assert.False(i.SetMethod.IsReadOnly);
verifier.VerifyIL("<top-level-statements-entry-point>", @"
{
// Code size 31 (0x1f)
.maxstack 2
.locals init (S V_0, //s
S V_1)
IL_0000: ldloca.s V_1
IL_0002: initobj ""S""
IL_0008: ldloca.s V_1
IL_000a: ldc.i4.1
IL_000b: call ""void S.I.init""
IL_0010: ldloc.1
IL_0011: stloc.0
IL_0012: ldloca.s V_0
IL_0014: call ""int S.I.get""
IL_0019: call ""void System.Console.Write(int)""
IL_001e: ret
}
");
}
[Fact]
[WorkItem(47612, "https://github.com/dotnet/roslyn/issues/47612")]
public void InitOnlyOnReadonlyProperty_AutoProp()
{
var verifier = CompileAndVerify(new[] { IsExternalInitTypeDefinition, @"
var s = new S { I = 1 };
System.Console.Write(s.I);
public struct S
{
public readonly int I { get; init; }
}
" }, verify: Verification.FailsPEVerify, expectedOutput: "1");
var s = verifier.Compilation.GetTypeByMetadataName("S");
var i = s.GetMember<IPropertySymbol>("I");
Assert.False(i.SetMethod.IsReadOnly);
verifier.VerifyIL("<top-level-statements-entry-point>", @"
{
// Code size 31 (0x1f)
.maxstack 2
.locals init (S V_0, //s
S V_1)
IL_0000: ldloca.s V_1
IL_0002: initobj ""S""
IL_0008: ldloca.s V_1
IL_000a: ldc.i4.1
IL_000b: call ""void S.I.init""
IL_0010: ldloc.1
IL_0011: stloc.0
IL_0012: ldloca.s V_0
IL_0014: call ""readonly int S.I.get""
IL_0019: call ""void System.Console.Write(int)""
IL_001e: ret
}
");
}
[Fact]
[WorkItem(47612, "https://github.com/dotnet/roslyn/issues/47612")]
public void InitOnlyOnReadonlyProperty_ManualProp()
{
var verifier = CompileAndVerify(new[] { IsExternalInitTypeDefinition, @"
var s = new S { I = 1 };
System.Console.Write(s.I);
public struct S
{
private readonly int i;
public readonly int I { get => i; init => i = value; }
}
" }, verify: Verification.FailsPEVerify, expectedOutput: "1");
var s = verifier.Compilation.GetTypeByMetadataName("S");
var i = s.GetMember<IPropertySymbol>("I");
Assert.False(i.SetMethod.IsReadOnly);
verifier.VerifyIL("<top-level-statements-entry-point>", @"
{
// Code size 31 (0x1f)
.maxstack 2
.locals init (S V_0, //s
S V_1)
IL_0000: ldloca.s V_1
IL_0002: initobj ""S""
IL_0008: ldloca.s V_1
IL_000a: ldc.i4.1
IL_000b: call ""void S.I.init""
IL_0010: ldloc.1
IL_0011: stloc.0
IL_0012: ldloca.s V_0
IL_0014: call ""readonly int S.I.get""
IL_0019: call ""void System.Console.Write(int)""
IL_001e: ret
}
");
}
[Fact]
[WorkItem(47612, "https://github.com/dotnet/roslyn/issues/47612")]
public void InitOnlyOnReadonlyInit_AutoProp()
{
var comp = CreateCompilation(new[] { IsExternalInitTypeDefinition, @"
public struct S
{
public int I { get; readonly init; }
}
" });
comp.VerifyDiagnostics(
// (4,34): error CS8903: 'init' accessors cannot be marked 'readonly'. Mark 'S.I' readonly instead.
// public int I { get; readonly init; }
Diagnostic(ErrorCode.ERR_InitCannotBeReadonly, "init", isSuppressed: false).WithArguments("S.I").WithLocation(4, 34)
);
var s = ((Compilation)comp).GetTypeByMetadataName("S");
var i = s.GetMember<IPropertySymbol>("I");
Assert.False(i.SetMethod.IsReadOnly);
Assert.True(((Symbols.PublicModel.PropertySymbol)i).GetSymbol<PropertySymbol>().SetMethod.IsDeclaredReadOnly);
}
[Fact]
[WorkItem(47612, "https://github.com/dotnet/roslyn/issues/47612")]
public void InitOnlyOnReadonlyInit_ManualProp()
{
var comp = CreateCompilation(new[] { IsExternalInitTypeDefinition, @"
public struct S
{
public int I { get => 1; readonly init { } }
}
" });
comp.VerifyDiagnostics(
// (4,39): error CS8903: 'init' accessors cannot be marked 'readonly'. Mark 'S.I' readonly instead.
// public int I { get => 1; readonly init { } }
Diagnostic(ErrorCode.ERR_InitCannotBeReadonly, "init", isSuppressed: false).WithArguments("S.I").WithLocation(4, 39)
);
var s = ((Compilation)comp).GetTypeByMetadataName("S");
var i = s.GetMember<IPropertySymbol>("I");
Assert.False(i.SetMethod.IsReadOnly);
Assert.True(((Symbols.PublicModel.PropertySymbol)i).GetSymbol<PropertySymbol>().SetMethod.IsDeclaredReadOnly);
}
[Fact]
[WorkItem(47612, "https://github.com/dotnet/roslyn/issues/47612")]
public void InitOnlyOnReadonlyInit_ReassignsSelf()
{
var verifier = CompileAndVerify(new[] { IsExternalInitTypeDefinition, @"
var s = new S { I1 = 1, I2 = 2 };
System.Console.WriteLine($""I1 is {s.I1}"");
public readonly struct S
{
private readonly int i;
public readonly int I1 { get => i; init => i = value; }
public int I2
{
get => throw null;
init
{
System.Console.WriteLine($""I1 was {I1}"");
this = default;
}
}
}
" }, verify: Verification.FailsPEVerify, expectedOutput: @"I1 was 1
I1 is 0");
var s = verifier.Compilation.GetTypeByMetadataName("S");
var i1 = s.GetMember<IPropertySymbol>("I1");
Assert.False(i1.SetMethod.IsReadOnly);
var i2 = s.GetMember<IPropertySymbol>("I2");
Assert.False(i2.SetMethod.IsReadOnly);
verifier.VerifyIL("<top-level-statements-entry-point>", @"
{
// Code size 54 (0x36)
.maxstack 2
.locals init (S V_0, //s
S V_1)
IL_0000: ldloca.s V_1
IL_0002: initobj ""S""
IL_0008: ldloca.s V_1
IL_000a: ldc.i4.1
IL_000b: call ""void S.I1.init""
IL_0010: ldloca.s V_1
IL_0012: ldc.i4.2
IL_0013: call ""void S.I2.init""
IL_0018: ldloc.1
IL_0019: stloc.0
IL_001a: ldstr ""I1 is {0}""
IL_001f: ldloca.s V_0
IL_0021: call ""int S.I1.get""
IL_0026: box ""int""
IL_002b: call ""string string.Format(string, object)""
IL_0030: call ""void System.Console.WriteLine(string)""
IL_0035: ret
}
");
}
[Fact]
[WorkItem(50126, "https://github.com/dotnet/roslyn/issues/50126")]
public void NestedInitializer()
{
var source = @"
using System;
Person person = new Person(""j"", ""p"");
Container c = new Container(person)
{
Person = { FirstName = ""c"" }
};
public record Person(String FirstName, String LastName);
public record Container(Person Person);
";
var comp = CreateCompilation(new[] { IsExternalInitTypeDefinition, source }, options: TestOptions.DebugExe);
comp.VerifyEmitDiagnostics(
// (7,16): error CS8852: Init-only property or indexer 'Person.FirstName' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Person = { FirstName = "c" }
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "FirstName").WithArguments("Person.FirstName").WithLocation(7, 16)
);
}
[Fact]
[WorkItem(50126, "https://github.com/dotnet/roslyn/issues/50126")]
public void NestedInitializer_NewT()
{
var source = @"
using System;
class C
{
void M<T>(Person person) where T : Container, new()
{
Container c = new T()
{
Person = { FirstName = ""c"" }
};
}
}
public record Person(String FirstName, String LastName);
public record Container(Person Person);
";
var comp = CreateCompilation(new[] { IsExternalInitTypeDefinition, source });
comp.VerifyEmitDiagnostics(
// (10,24): error CS8852: Init-only property or indexer 'Person.FirstName' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// Person = { FirstName = "c" }
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "FirstName").WithArguments("Person.FirstName").WithLocation(10, 24)
);
}
[Fact]
[WorkItem(50126, "https://github.com/dotnet/roslyn/issues/50126")]
public void NestedInitializer_UsingGenericType()
{
var source = @"
using System;
Person person = new Person(""j"", ""p"");
var c = new Container<Person>(person)
{
PropertyT = { FirstName = ""c"" }
};
public record Person(String FirstName, String LastName);
public record Container<T>(T PropertyT) where T : Person;
";
var comp = CreateCompilation(new[] { IsExternalInitTypeDefinition, source }, options: TestOptions.DebugExe);
comp.VerifyEmitDiagnostics(
// (7,19): error CS8852: Init-only property or indexer 'Person.FirstName' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// PropertyT = { FirstName = "c" }
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "FirstName").WithArguments("Person.FirstName").WithLocation(7, 19)
);
}
[Fact]
[WorkItem(50126, "https://github.com/dotnet/roslyn/issues/50126")]
public void NestedInitializer_UsingNew()
{
var source = @"
using System;
Person person = new Person(""j"", ""p"");
Container c = new Container(person)
{
Person = new Person(""j"", ""p"") { FirstName = ""c"" }
};
Console.Write(c.Person.FirstName);
public record Person(String FirstName, String LastName);
public record Container(Person Person);
";
var comp = CreateCompilation(new[] { IsExternalInitTypeDefinition, source }, options: TestOptions.DebugExe);
comp.VerifyEmitDiagnostics();
// PEVerify: Cannot change initonly field outside its .ctor.
CompileAndVerify(comp, expectedOutput: "c", verify: Verification.FailsPEVerify);
}
[Fact]
[WorkItem(50126, "https://github.com/dotnet/roslyn/issues/50126")]
public void NestedInitializer_UsingNewNoPia()
{
string pia = @"
using System;
using System.Runtime.InteropServices;
[assembly: ImportedFromTypeLib(""GeneralPIA.dll"")]
[assembly: Guid(""f9c2d51d-4f44-45f0-9eda-c9d599b58257"")]
[ComImport()]
[Guid(""f9c2d51d-4f44-45f0-9eda-c9d599b58277"")]
[CoClass(typeof(ClassITest28))]
public interface ITest28
{
int Property { get; init; }
}
[Guid(""f9c2d51d-4f44-45f0-9eda-c9d599b58278"")]
public abstract class ClassITest28 //: ITest28
{
public ClassITest28(int x) { }
}
";
var piaCompilation = CreateCompilationWithMscorlib461(new[] { IsExternalInitTypeDefinition, pia }, options: TestOptions.DebugDll);
CompileAndVerify(piaCompilation);
string source = @"
class UsePia
{
public ITest28 Property2 { get; init; }
public static void Main()
{
var x1 = new ITest28() { Property = 42 };
var x2 = new UsePia() { Property2 = { Property = 43 } };
}
}";
var compilation = CreateCompilationWithMscorlib461(new[] { source },
new MetadataReference[] { new CSharpCompilationReference(piaCompilation, embedInteropTypes: true) },
options: TestOptions.DebugExe);
compilation.VerifyDiagnostics(
// (9,47): error CS8852: Init-only property or indexer 'ITest28.Property' can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.
// var x2 = new UsePia() { Property2 = { Property = 43 } };
Diagnostic(ErrorCode.ERR_AssignmentInitOnly, "Property").WithArguments("ITest28.Property").WithLocation(9, 47)
);
}
[Fact, WorkItem(50696, "https://github.com/dotnet/roslyn/issues/50696")]
public void PickAmbiguousTypeFromCorlib()
{
var corlib_cs = @"
namespace System
{
public class Object { }
public struct Int32 { }
public struct Boolean { }
public class String { }
public class ValueType { }
public struct Void { }
public class Attribute { }
public class AttributeUsageAttribute : Attribute
{
public AttributeUsageAttribute(AttributeTargets t) { }
public bool AllowMultiple { get; set; }
public bool Inherited { get; set; }
}
public struct Enum { }
public enum AttributeTargets { }
}
";
string source = @"
public class C
{
public int Property { get; init; }
}
";
var corlibWithoutIsExternalInitRef = CreateEmptyCompilation(corlib_cs, assemblyName: "corlibWithoutIsExternalInit")
.EmitToImageReference();
var corlibWithIsExternalInitRef = CreateEmptyCompilation(corlib_cs + IsExternalInitTypeDefinition, assemblyName: "corlibWithIsExternalInit")
.EmitToImageReference();
var libWithIsExternalInitRef = CreateEmptyCompilation(IsExternalInitTypeDefinition, references: new[] { corlibWithoutIsExternalInitRef }, assemblyName: "libWithIsExternalInit")
.EmitToImageReference();
var libWithIsExternalInitRef2 = CreateEmptyCompilation(IsExternalInitTypeDefinition, references: new[] { corlibWithoutIsExternalInitRef }, assemblyName: "libWithIsExternalInit2")
.EmitToImageReference();
{
// type in source
var comp = CreateEmptyCompilation(new[] { source, IsExternalInitTypeDefinition }, references: new[] { corlibWithoutIsExternalInitRef }, assemblyName: "source");
comp.VerifyEmitDiagnostics();
verify(comp, "source");
}
{
// type in library
var comp = CreateEmptyCompilation(new[] { source }, references: new[] { corlibWithoutIsExternalInitRef, libWithIsExternalInitRef }, assemblyName: "source");
comp.VerifyEmitDiagnostics();
verify(comp, "libWithIsExternalInit");
}
{
// type in corlib and in source
var comp = CreateEmptyCompilation(new[] { source, IsExternalInitTypeDefinition }, references: new[] { corlibWithIsExternalInitRef }, assemblyName: "source");
comp.VerifyEmitDiagnostics();
verify(comp, "source");
}
{
// type in corlib, in library and in source
var comp = CreateEmptyCompilation(new[] { source, IsExternalInitTypeDefinition }, references: new[] { corlibWithIsExternalInitRef, libWithIsExternalInitRef }, assemblyName: "source");
comp.VerifyEmitDiagnostics();
verify(comp, "source");
}
{
// type in corlib and in two libraries
var comp = CreateEmptyCompilation(source, references: new[] { corlibWithIsExternalInitRef, libWithIsExternalInitRef, libWithIsExternalInitRef2 });
comp.VerifyEmitDiagnostics();
verify(comp, "corlibWithIsExternalInit");
}
{
// type in corlib and in two libraries (corlib in middle)
var comp = CreateEmptyCompilation(source, references: new[] { libWithIsExternalInitRef, corlibWithIsExternalInitRef, libWithIsExternalInitRef2 });
comp.VerifyEmitDiagnostics();
verify(comp, "corlibWithIsExternalInit");
}
{
// type in corlib and in two libraries (corlib last)
var comp = CreateEmptyCompilation(source, references: new[] { libWithIsExternalInitRef, libWithIsExternalInitRef2, corlibWithIsExternalInitRef });
comp.VerifyEmitDiagnostics();
verify(comp, "corlibWithIsExternalInit");
}
{
// type in corlib and in two libraries, but flag is set
var comp = CreateEmptyCompilation(source, references: new[] { corlibWithIsExternalInitRef, libWithIsExternalInitRef, libWithIsExternalInitRef2 },
options: TestOptions.DebugDll.WithTopLevelBinderFlags(BinderFlags.IgnoreCorLibraryDuplicatedTypes));
comp.VerifyEmitDiagnostics(
// (4,32): error CS0518: Predefined type 'System.Runtime.CompilerServices.IsExternalInit' is not defined or imported
// public int Property { get; init; }
Diagnostic(ErrorCode.ERR_PredefinedTypeNotFound, "init").WithArguments("System.Runtime.CompilerServices.IsExternalInit").WithLocation(4, 32)
);
}
{
// type in two libraries
var comp = CreateEmptyCompilation(source, references: new[] { corlibWithoutIsExternalInitRef, libWithIsExternalInitRef, libWithIsExternalInitRef2 });
comp.VerifyEmitDiagnostics(
// (4,32): error CS018: Predefined type 'System.Runtime.CompilerServices.IsExternalInit' is not defined or imported
// public int Property { get; init; }
Diagnostic(ErrorCode.ERR_PredefinedTypeNotFound, "init").WithArguments("System.Runtime.CompilerServices.IsExternalInit").WithLocation(4, 32)
);
}
{
// type in two libraries, but flag is set
var comp = CreateEmptyCompilation(source, references: new[] { corlibWithoutIsExternalInitRef, libWithIsExternalInitRef, libWithIsExternalInitRef2 },
options: TestOptions.DebugDll.WithTopLevelBinderFlags(BinderFlags.IgnoreCorLibraryDuplicatedTypes));
comp.VerifyEmitDiagnostics(
// (4,32): error CS0518: Predefined type 'System.Runtime.CompilerServices.IsExternalInit' is not defined or imported
// public int Property { get; init; }
Diagnostic(ErrorCode.ERR_PredefinedTypeNotFound, "init").WithArguments("System.Runtime.CompilerServices.IsExternalInit").WithLocation(4, 32)
);
}
{
// type in corlib and in a library
var comp = CreateEmptyCompilation(source, references: new[] { corlibWithIsExternalInitRef, libWithIsExternalInitRef });
comp.VerifyEmitDiagnostics();
verify(comp, "corlibWithIsExternalInit");
}
{
// type in corlib and in a library (reverse order)
var comp = CreateEmptyCompilation(source, references: new[] { libWithIsExternalInitRef, corlibWithIsExternalInitRef });
comp.VerifyEmitDiagnostics();
verify(comp, "corlibWithIsExternalInit");
}
{
// type in corlib and in a library, but flag is set
var comp = CreateEmptyCompilation(source, references: new[] { corlibWithIsExternalInitRef, libWithIsExternalInitRef },
options: TestOptions.DebugDll.WithTopLevelBinderFlags(BinderFlags.IgnoreCorLibraryDuplicatedTypes));
comp.VerifyEmitDiagnostics();
Assert.Equal("libWithIsExternalInit", comp.GetWellKnownType(WellKnownType.System_Runtime_CompilerServices_IsExternalInit).ContainingAssembly.Name);
Assert.Equal("corlibWithIsExternalInit", comp.GetTypeByMetadataName("System.Runtime.CompilerServices.IsExternalInit").ContainingAssembly.Name);
}
static void verify(CSharpCompilation comp, string expectedAssemblyName)
{
var modifier = ((SourcePropertySymbol)comp.GlobalNamespace.GetMember("C.Property")).SetMethod.ReturnTypeWithAnnotations.CustomModifiers.Single();
Assert.Equal(expectedAssemblyName, modifier.Modifier.ContainingAssembly.Name);
Assert.Equal(expectedAssemblyName, comp.GetWellKnownType(WellKnownType.System_Runtime_CompilerServices_IsExternalInit).ContainingAssembly.Name);
Assert.Equal(expectedAssemblyName, comp.GetTypeByMetadataName("System.Runtime.CompilerServices.IsExternalInit").ContainingAssembly.Name);
}
}
[Theory, WorkItem(67079, "https://github.com/dotnet/roslyn/issues/67079")]
[CombinatorialData]
public void DoNotPickTypeFromSourceWithFileModifier(bool useCompilationReference)
{
var corlib_cs = """
namespace System
{
public class Object { }
public struct Int32 { }
public struct Boolean { }
public class String { }
public class ValueType { }
public struct Void { }
public class Attribute { }
public class AttributeUsageAttribute : Attribute
{
public AttributeUsageAttribute(AttributeTargets t) { }
public bool AllowMultiple { get; set; }
public bool Inherited { get; set; }
}
public struct Enum { }
public enum AttributeTargets { }
}
""";
var source = """
namespace System.Runtime.CompilerServices
{
file class IsExternalInit {}
}
public class C
{
public string Property { get; init; }
}
""";
var corlibWithoutIsExternalInitRef = AsReference(CreateEmptyCompilation(corlib_cs), useCompilationReference);
var corlibWithIsExternalInitRef = AsReference(CreateEmptyCompilation(corlib_cs + IsExternalInitTypeDefinition), useCompilationReference);
var emitOptions = EmitOptions.Default.WithRuntimeMetadataVersion("0.0.0.0");
{
// proper type in corlib and file type in source
var comp = CreateEmptyCompilation(source, references: new[] { corlibWithIsExternalInitRef });
comp.VerifyEmitDiagnostics(emitOptions);
var modifier = ((SourcePropertySymbol)comp.GlobalNamespace.GetMember("C.Property")).SetMethod.ReturnTypeWithAnnotations.CustomModifiers.Single();
Assert.False(modifier.Modifier.IsFileLocal);
}
{
// no type in corlib and file type in source
var comp = CreateEmptyCompilation(source, references: new[] { corlibWithoutIsExternalInitRef });
comp.VerifyEmitDiagnostics(emitOptions,
// (8,35): error CS018: Predefined type 'System.Runtime.CompilerServices.IsExternalInit' is not defined or imported
// public int Property { get; init; }
Diagnostic(ErrorCode.ERR_PredefinedTypeNotFound, "init").WithArguments("System.Runtime.CompilerServices.IsExternalInit").WithLocation(8, 35)
);
var modifier = ((SourcePropertySymbol)comp.GlobalNamespace.GetMember("C.Property")).SetMethod.ReturnTypeWithAnnotations.CustomModifiers.Single();
Assert.False(modifier.Modifier.IsFileLocal);
}
}
}
}
|