File: IntroduceVariable\IntroduceVariableTests.cs
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Project: src\src\Features\CSharpTest\Microsoft.CodeAnalysis.CSharp.Features.UnitTests.csproj (Microsoft.CodeAnalysis.CSharp.Features.UnitTests)
// 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.
 
using System.Collections.Immutable;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CodeRefactorings;
using Microsoft.CodeAnalysis.CodeStyle;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.CodeStyle;
using Microsoft.CodeAnalysis.CSharp.Test.Utilities;
using Microsoft.CodeAnalysis.Editor.UnitTests.CodeActions;
using Microsoft.CodeAnalysis.IntroduceVariable;
using Microsoft.CodeAnalysis.Test.Utilities;
using Microsoft.CodeAnalysis.UnitTests;
using Roslyn.Test.Utilities;
using Xunit;
 
namespace Microsoft.CodeAnalysis.Editor.CSharp.UnitTests.CodeRefactorings.IntroduceVariable;
 
[Trait(Traits.Feature, Traits.Features.CodeActionsIntroduceVariable)]
public class IntroduceVariableTests : AbstractCSharpCodeActionTest_NoEditor
{
    protected override CodeRefactoringProvider CreateCodeRefactoringProvider(TestWorkspace workspace, TestParameters parameters)
        => new IntroduceVariableCodeRefactoringProvider();
 
    protected override ImmutableArray<CodeAction> MassageActions(ImmutableArray<CodeAction> actions)
        => GetNestedActions(actions);
 
    private readonly CodeStyleOption2<bool> onWithInfo = new CodeStyleOption2<bool>(true, NotificationOption2.Suggestion);
 
    // specify all options explicitly to override defaults.
    private OptionsCollection ImplicitTypingEverywhere()
        => new(GetLanguage())
        {
            { CSharpCodeStyleOptions.VarElsewhere, onWithInfo },
            { CSharpCodeStyleOptions.VarWhenTypeIsApparent, onWithInfo },
            { CSharpCodeStyleOptions.VarForBuiltInTypes, onWithInfo },
        };
 
    // Workaround to mimic awaitable `ValueTask` type from the runtime 
    private const string ValueTaskDeclaration = """
        namespace System.Runtime.CompilerServices
        {
            public class AsyncMethodBuilderAttribute : System.Attribute { }
        }
        
        namespace System.Threading.Tasks
        {
            [System.Runtime.CompilerServices.AsyncMethodBuilder]
            public struct ValueTask { }
        }
        """;
 
    [Fact]
    public async Task TestEmptySpan1()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class C
            {
                void M(Action action)
                {
                    M(() [||]=> { });
                }
            }
            """,
            """
            using System;
            class C
            {
                void M(Action action)
                {
                    Action {|Rename:action1|} = () => { };
                    M(action1);
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestEmptySpan2()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class C
            {
                void M(int a, int b)
                {
                    var x = a [||]+ b + 3;
                }
            }
            """,
            """
            using System;
            class C
            {
                void M(int a, int b)
                {
                    int {|Rename:v|} = a + b;
                    var x = v + 3;
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestEmptySpan3()
    {
        await TestMissingAsync(
            """
            using System;
            class C
            {
                void M(int a)
                {
                    var x = [||]a;
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/35525")]
    public async Task TestEmptySpan4()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class C
            {
                void M(Action action)
                {
                    M(() => { var x [||]= y; });
                }
            }
            """,
            """
            using System;
            class C
            {
                void M(Action action)
                {
                    Action {|Rename:value|} = () => { var x[||] = y; };
                    M(value);
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestMethodFix1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void Goo()
                {
                    Bar([|1 + 1|]);
                    Bar(1 + 1);
                }
            }
            """,
            """
            class C
            {
                void Goo()
                {
                    const int {|Rename:V|} = 1 + 1;
                    Bar(V);
                    Bar(1 + 1);
                }
            }
            """,
            index: 2);
    }
 
    [Fact]
    public async Task TestMethodFix2()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void Goo()
                {
                    Bar([|1 + 1|]);
                    Bar(1 + 1);
                }
            }
            """,
            """
            class C
            {
                void Goo()
                {
                    const int {|Rename:V|} = 1 + 1;
                    Bar(V);
                    Bar(V);
                }
            }
            """,
            index: 3);
    }
 
    [Fact]
    public async Task TestMethodFix3()
    {
        var code =
            """
            class C
            {
                void Goo()
                {
                    Bar(([|1 + 1|]));
                    Bar((1 + 1));
                }
            }
            """;
 
        var expected =
            """
            class C
            {
                void Goo()
                {
                    const int {|Rename:V|} = 1 + 1;
                    Bar(V);
                    Bar((1 + 1));
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task TestMethodFix4()
    {
        var code =
            """
            class C
            {
                void Goo()
                {
                    Bar(([|1 + 1|]));
                    Bar((1 + 1));
                }
            }
            """;
 
        var expected =
            """
            class C
            {
                void Goo()
                {
                    const int {|Rename:V|} = 1 + 1;
                    Bar(V);
                    Bar(V);
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 3);
    }
 
    [Fact]
    public async Task TestThrowExpression()
    {
        var code =
            """
            class C
            {
                void M(bool b)
                {
                    var x = b ? 1 : [|throw null|];
                }
            }
            """;
        await TestActionCountAsync(code, count: 0);
    }
 
    [Fact]
    public async Task TestThrowExpression2()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void M(bool b)
                {
                    var x = [|b ? 1 : throw null|];
                }
            }
            """,
            """
            class C
            {
                void M(bool b)
                {
                    int {|Rename:v|} = b ? 1 : throw null;
                    var x = v;
                }
            }
            """,
            index: 1);
    }
 
    [Fact]
    public async Task TestThrowStatement()
    {
        var code =
            """
            class C
            {
                void M()
                {
                    [|throw null|];
                }
            }
            """;
        await TestActionCountAsync(code, count: 0);
    }
 
    [Fact]
    public async Task TestFieldFix1()
    {
        var code =
            """
            class C
            {
                int i = ([|1 + 1|]) + (1 + 1);
            }
            """;
 
        var expected =
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
                int i = V + (1 + 1);
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestFieldFix2()
    {
        var code =
            """
            class C
            {
                int i = ([|1 + 1|]) + (1 + 1);
            }
            """;
 
        var expected =
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
                int i = V + V;
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/21747")]
    public async Task TestTriviaFieldFix1()
    {
        var code =
            """
            class C
            {
                int i = (/* CommentLeading */ [|1 + 1|] /* CommentTrailing */) + (1 + 1);
            }
            """;
 
        var expected =
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
                int i = /* CommentLeading */ V /* CommentTrailing */ + V;
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/21747")]
    public async Task TestTriviaFieldFix2()
    {
        var code =
            """
            class C
            {
                int i = (/* CommentLeading */ [|1 + /*CommentEmbedded*/ 1|] /* CommentTrailing */) + (1 + 1);
            }
            """;
 
        var expected =
            """
            class C
            {
                private const int {|Rename:V|} = 1 + /*CommentEmbedded*/ 1;
                int i = /* CommentLeading */ V /* CommentTrailing */ + V;
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact]
    public async Task TestConstFieldFix1()
    {
        var code =
            """
            class C
            {
                const int i = ([|1 + 1|]) + (1 + 1);
            }
            """;
 
        var expected =
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
                const int i = V + (1 + 1);
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestConstFieldFix2()
    {
        var code =
            """
            class C
            {
                const int i = ([|1 + 1|]) + (1 + 1);
            }
            """;
 
        var expected =
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
                const int i = V + V;
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact]
    public async Task TestConstructorFix1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                public C() : this([|1 + 1|], 1 + 1)
                {
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
 
                public C() : this(V, 1 + 1)
                {
                }
            }
            """,
            index: 0);
    }
 
    [Fact]
    public async Task TestConstructorFix2()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                public C() : this([|1 + 1|], 1 + 1)
                {
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
 
                public C() : this(V, V)
                {
                }
            }
            """,
            index: 1);
    }
 
    [Fact]
    public async Task TestParameterFix1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void Bar(int i = [|1 + 1|], int j = 1 + 1)
                {
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
 
                void Bar(int i = V, int j = 1 + 1)
                {
                }
            }
            """,
            index: 0);
    }
 
    [Fact]
    public async Task TestParameterFix2()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void Bar(int i = [|1 + 1|], int j = 1 + 1)
                {
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
 
                void Bar(int i = V, int j = V)
                {
                }
            }
            """,
            index: 1);
    }
 
    [Fact]
    public async Task TestAttributeFix1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                [Goo([|1 + 1|], 1 + 1)]
                void Bar()
                {
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
 
                [Goo(V, 1 + 1)]
                void Bar()
                {
                }
            }
            """,
            index: 0);
    }
 
    [Fact]
    public async Task TestAttributeFix2()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                [Goo([|1 + 1|], 1 + 1)]
                void Bar()
                {
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
 
                [Goo(V, V)]
                void Bar()
                {
                }
            }
            """,
            index: 1);
    }
 
    [Fact]
    public async Task TestMethodFixExistingName1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void Goo()
                {
                    int V = 0;
                    Bar([|1 + 1|]);
                    Bar(1 + 1);
                }
            }
            """,
            """
            class C
            {
                void Goo()
                {
                    int V = 0;
                    const int {|Rename:V1|} = 1 + 1;
                    Bar(V1);
                    Bar(1 + 1);
                }
            }
            """,
            index: 2);
    }
 
    [Fact]
    public async Task TestFieldExistingName1()
    {
        var code =
            """
            class C
            {
                int V;
                int V1;
                int i = ([|1 + 1|]) + (1 + 1);
            }
            """;
 
        var expected =
            """
            class C
            {
                private const int {|Rename:V2|} = 1 + 1;
                int V;
                int V1;
                int i = V2 + (1 + 1);
            }
            """;
 
        await TestInRegularAndScriptAsync(
            code,
            expected,
            index: 0);
    }
 
    [Fact]
    public async Task TestMethodFixComplexName1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                static int Baz;
 
                void Goo()
                {
                    Bar([|C.Baz|]);
                    Bar(1 + 1);
                }
            }
            """,
            """
            class C
            {
                static int Baz;
 
                void Goo()
                {
                    var {|Rename:baz|} = C.Baz;
                    Bar(baz);
                    Bar(1 + 1);
                }
            }
            """,
            index: 0,
            options: ImplicitTypingEverywhere());
    }
 
    [Fact]
    public async Task TestMethodFixComplexName1NotVar()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                static int Baz;
 
                void Goo()
                {
                    Bar([|C.Baz|]);
                    Bar(1 + 1);
                }
            }
            """,
            """
            class C
            {
                static int Baz;
 
                void Goo()
                {
                    int {|Rename:baz|} = C.Baz;
                    Bar(baz);
                    Bar(1 + 1);
                }
            }
            """,
            index: 0);
    }
 
    [Fact]
    public async Task TestNameConflict1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                public C(int V) : this([|1 + 1|])
                {
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 1 + 1;
 
                public C(int V) : this(C.V)
                {
                }
            }
            """,
            index: 0);
    }
 
    [Fact]
    public async Task TestNameConflict2()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                private static int v = 5;
 
                static void Main(string[] args)
                {
                    Func<int, int> d = (x) => {
                        return [|x * v|];
                    };
                    d.Invoke(v);
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                private static int v = 5;
 
                static void Main(string[] args)
                {
                    Func<int, int> d = (x) => {
                        var {|Rename:v1|} = x * v;
                        return v1;
                    };
                    d.Invoke(v);
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact]
    public async Task TestNameConflict2NotVar()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                private static int v = 5;
 
                static void Main(string[] args)
                {
                    Func<int, int> d = (x) => {
                        return [|x * v|];
                    };
                    d.Invoke(v);
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                private static int v = 5;
 
                static void Main(string[] args)
                {
                    Func<int, int> d = (x) => {
                        int {|Rename:v1|} = x * v;
                        return v1;
                    };
                    d.Invoke(v);
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestNameVerbatimIdentifier1()
    {
        await TestInRegularAndScriptAsync(
            """
            static class G<T>
            {
                public class @class
                {
                }
 
                public static void Add(object @class)
                {
                }
            }
 
            class Program
            {
                static void Main()
                {
                    G<int>.Add([|new G<int>.@class()|]);
                }
            }
            """,
            """
            static class G<T>
            {
                public class @class
                {
                }
 
                public static void Add(object @class)
                {
                }
            }
 
            class Program
            {
                static void Main()
                {
                    var {|Rename:@class|} = new G<int>.@class();
                    G<int>.Add(@class);
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact]
    public async Task TestNameVerbatimIdentifier1NoVar()
    {
        await TestInRegularAndScriptAsync(
            """
            static class G<T>
            {
                public class @class
                {
                }
 
                public static void Add(object @class)
                {
                }
            }
 
            class Program
            {
                static void Main()
                {
                    G<int>.Add([|new G<int>.@class()|]);
                }
            }
            """,
            """
            static class G<T>
            {
                public class @class
                {
                }
 
                public static void Add(object @class)
                {
                }
            }
 
            class Program
            {
                static void Main()
                {
                    G<int>.@class {|Rename:@class|} = new G<int>.@class();
                    G<int>.Add(@class);
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestNameVerbatimIdentifier2()
    {
        await TestInRegularAndScriptAsync(
            """
            static class G<T>
            {
                public class @class
                {
                }
 
                public static void Add(object @class)
                {
                }
 
                static void Main()
                {
                    G<int>.Add([|new G<int>.@class()|]);
                }
            }
            """,
            """
            static class G<T>
            {
                public class @class
                {
                }
 
                public static void Add(object @class)
                {
                }
 
                static void Main()
                {
                    var {|Rename:@class|} = new G<int>.@class();
                    G<int>.Add(@class);
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact]
    public async Task TestNameVerbatimIdentifier2NoVar()
    {
        await TestInRegularAndScriptAsync(
            """
            static class G<T>
            {
                public class @class
                {
                }
 
                public static void Add(object @class)
                {
                }
 
                static void Main()
                {
                    G<int>.Add([|new G<int>.@class()|]);
                }
            }
            """,
            """
            static class G<T>
            {
                public class @class
                {
                }
 
                public static void Add(object @class)
                {
                }
 
                static void Main()
                {
                    G<int>.@class {|Rename:@class|} = new G<int>.@class();
                    G<int>.Add(@class);
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/540078")]
    public async Task TestConstantField1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                int[] array = new int[[|10|]];
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 10;
                int[] array = new int[V];
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/540079")]
    public async Task TestFormattingOfReplacedExpression1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void M()
                {
                    int i = [|1 + 2|] + 3;
                }
            }
            """,
            """
            class C
            {
                void M()
                {
                    const int {|Rename:V|} = 1 + 2;
                    int i = V + 3;
                }
            }
            """,
index: 2);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/540468")]
    public async Task TestCantExtractMethodTypeParameterToField()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Collections.Generic;
            using System.Linq;
 
            class Program
            {
                static void Main<T>(string[] args)
                {
                    Goo([|(T)2.ToString()|]);
                }
            }
            """,
            """
            using System;
            using System.Collections.Generic;
            using System.Linq;
 
            class Program
            {
                static void Main<T>(string[] args)
                {
                    var {|Rename:t|} = (T)2.ToString();
                    Goo(t);
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/540468")]
    public async Task TestCantExtractMethodTypeParameterToFieldCount()
    {
        await TestActionCountAsync(
            """
            using System;
            using System.Collections.Generic;
            using System.Linq;
 
            class Program
            {
                static void Main<T>(string[] args)
                {
                    Goo([|(T)2.ToString()|]);
                }
            }
            """,
count: 2);
    }
 
    [WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/552389")]
    [WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/540482")]
    [Fact(Skip = "552389")]
    public async Task TestConstantForFixedBufferInitializer()
    {
        await TestInRegularAndScriptAsync(
            """
            unsafe struct S
            {
                fixed int buffer[[|10|]];
            }
            """,
            """
            unsafe struct S
            {
                private const int p = 10;
                fixed int buffer[p];
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/540486")]
    public async Task TestFormattingOfIntroduceLocal()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void M()
                {
                    int i = [|1 + 2|] + 3;
                }
            }
            """,
            """
            class C
            {
                void M()
                {
                    const int {|Rename:V|} = 1 + 2;
                    int i = V + 3;
                }
            }
            """,
index: 2);
    }
 
    [Fact]
    public async Task TestLocalConstant()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                static void Main(string[] args)
                {
                    const int i = [|1|] + 1;
                }
            }
            """,
            """
            class Program
            {
                static void Main(string[] args)
                {
                    const int {|Rename:V|} = 1;
                    const int i = V + 1;
                }
            }
            """,
index: 2);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/542699")]
    public async Task TestFieldConstant()
    {
        await TestInRegularAndScriptAsync(
            """
            [Goo(2 + 3 + 4)]
            class Program
            {
                int x = [|2 + 3|] + 4;
            }
 
            internal class GooAttribute : System.Attribute
            {
                public GooAttribute(int x)
                {
                }
            }
            """,
            """
            [Goo(V + 4)]
            class Program
            {
                private const int {|Rename:V|} = 2 + 3;
                int x = V + 4;
            }
 
            internal class GooAttribute : System.Attribute
            {
                public GooAttribute(int x)
                {
                }
            }
            """,
index: 1);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/542781")]
    public async Task TestMissingOnExpressionStatement()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            class Program
            {
                static void Main(string[] args)
                {
                    int i;
                    [|i = 2|];
                    i = 3;
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/542780")]
    public async Task TestSingleQueryClause()
    {
        await TestInRegularAndScriptAsync(
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                select [|i + j|];
                }
            }
            """,
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                let {|Rename:v|} = i + j
                                select v;
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/542780")]
    public async Task TestSingleQuerySelectOrGroupByClause()
    {
        await TestInRegularAndScriptAsync(
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                where [|i + j|] > 5
                                select i + j;
                }
            }
            """,
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                let {|Rename:v|} = i + j
                                where v > 5
                                select i + j;
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestLinqQuery()
    {
        await TestInRegularAndScriptAsync(
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                where [|i + j|] > 5
                                let x = j + i
                                select i + j;
                }
            }
            """,
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                let {|Rename:v|} = i + j
                                where v > 5
                                let x = j + i
                                select v;
                }
            }
            """,
index: 1);
    }
 
    [Fact]
    public async Task TestSingleQueryReplaceAll()
    {
        await TestInRegularAndScriptAsync(
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                where i + j > 5
                                let x = j + i
                                select [|i + j|];
                }
            }
            """,
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                let {|Rename:v|} = i + j
                                where v > 5
                                let x = j + i
                                select v;
                }
            }
            """,
index: 1);
    }
 
    [Fact]
    public async Task TestNestedQueryReplaceOne1()
    {
        await TestInRegularAndScriptAsync(
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                where i > (from k in new int[] { 3 }
 
                                           select [|i + j|]).Max()
                                where j > (from m in new int[] { 4 }
 
                                           select i + j).Max()
                                let x = j + i
                                select i + j;
                }
            }
            """,
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                where i > (from k in new int[] { 3 }
 
                                           let {|Rename:v|} = i + j
                                           select v).Max()
                                where j > (from m in new int[] { 4 }
 
                                           select i + j).Max()
                                let x = j + i
                                select i + j;
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestNestedQueryReplaceAll1()
    {
        await TestInRegularAndScriptAsync(
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                where i > (from k in new int[] { 3 }
 
                                           select [|i + j|]).Max()
                                where j > (from m in new int[] { 4 }
 
                                           select i + j).Max()
                                let x = j + i
                                select i + j;
                }
            }
            """,
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                let {|Rename:v|} = i + j
                                where i > (from k in new int[] { 3 }
 
                                           select v).Max()
                                where j > (from m in new int[] { 4 }
 
                                           select v).Max()
                                let x = j + i
                                select v;
                }
            }
            """,
index: 1);
    }
 
    [Fact]
    public async Task TestNestedQueryReplaceOne2()
    {
        await TestInRegularAndScriptAsync(
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                where i > (from k in new int[] { 3 }
 
                                           select i + j).Max()
                                where j > (from m in new int[] { 4 }
 
                                           select [|i + j|]).Max()
                                let x = j + i
                                select i + j;
                }
            }
            """,
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                where i > (from k in new int[] { 3 }
 
                                           select i + j).Max()
                                where j > (from m in new int[] { 4 }
 
                                           let {|Rename:v|} = i + j
                                           select v).Max()
                                let x = j + i
                                select i + j;
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestNestedQueryReplaceAll2()
    {
        await TestInRegularAndScriptAsync(
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                where i > (from k in new int[] { 3 }
 
                                           select i + j).Max()
                                where j > (from m in new int[] { 4 }
 
                                           select [|i + j|]).Max()
                                let x = j + i
                                select i + j;
                }
            }
            """,
            """
            using System.Linq;
 
            class Program
            {
                void Main()
                {
                    var query = from i in new int[] { 1 }
 
                                from j in new int[] { 2 }
 
                                let {|Rename:v|} = i + j
                                where i > (from k in new int[] { 3 }
 
                                           select v).Max()
                                where j > (from m in new int[] { 4 }
 
                                           select v).Max()
                                let x = j + i
                                select v;
                }
            }
            """,
index: 1);
    }
 
    [Fact, WorkItem(10742, "DevDiv_Projects/Roslyn")]
    public async Task TestAnonymousTypeMemberAssignment()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            class C
            {
                void M()
                {
                    var a = new { [|A = 0|] };
                }
            }
            """);
    }
 
    [Fact, WorkItem(10743, "DevDiv_Projects/Roslyn")]
    public async Task TestAnonymousTypeBody()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                void Main()
                {
                    var a = new [|{ A = 0 }|];
                }
            }
            """,
            """
            class Program
            {
                void Main()
                {
                    var {|Rename:value|} = new { A = 0 };
                    var a = value;
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/543477")]
    public async Task TestImplicitlyTypedArraysUsedInCheckedExpression()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                static void Main(string[] args)
                {
                    int[] a = null;
                    int[] temp = checked([|a = new[] { 1, 2, 3 }|]);
                }
            }
            """,
            """
            class Program
            {
                static void Main(string[] args)
                {
                    int[] a = null;
                    var {|Rename:ints|} = a = new[] { 1, 2, 3 };
                    int[] temp = checked(ints);
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/543832")]
    public async Task TestMissingOnGenericTypeParameter()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            class C
            {
                void M()
                {
                    F<[|int?|], int?>(3);
                }
 
                R F<T, R>(T arg1)
                {
                    return default(R);
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/543941")]
    public async Task TestAnonymousType1()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                void Main()
                {
                    WriteLine([|new { X = 1 }|]);
                }
            }
            """,
            """
            class Program
            {
                void Main()
                {
                    var {|Rename:value|} = new { X = 1 };
                    WriteLine(value);
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/544099")]
    public async Task TestMissingOnAttributeNameEquals()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            using System;
            using System.Runtime.InteropServices;
 
            class M
            {
                [DllImport("user32.dll", [|CharSet|] = CharSet.Auto)]
                public static extern IntPtr FindWindow(string className, string windowTitle);
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/544162")]
    public async Task TestMissingOnRightOfDot()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            using System;
            using System.Runtime.InteropServices;
 
            class M
            {
                [DllImport("user32.dll", CharSet = CharSet.[|Auto|])]
                public static extern IntPtr FindWindow(string className, string windowTitle);
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/544209")]
    public async Task TestMissingOnAttributeNamedParameter()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            using System;
 
            class TestAttribute : Attribute
            {
                public TestAttribute(int a = 42)
                {
                }
            }
 
            [Test([|a|]: 1)]
            class Goo
            {
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/544264")]
    public async Task TestMissingOnVariableWrite()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            class Program
            {
                void Main()
                {
                    var x = new int[3];
                    [|x[1]|] = 2;
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/544577")]
    [WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/909152")]
    public async Task TestExpressionTLambda()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            using System;
            using System.Linq.Expressions;
 
            class Program
            {
                static Expression<Func<int?, char?>> e1 = c => [|null|];
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/544915")]
    public async Task TestMissingOnTypeSyntax()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                void Main()
                {
                    int[,] array2Da = new [|int[1, 2]|] { { 1, 2 } };
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/544610")]
    public async Task ParenthesizeIfParseChanges()
    {
        var code = """
            class C
            {
                static void M()
                {
                    int x = 2;
                    Bar(x < [|1|], x > (2 + 3));
                }
            }
            """;
 
        var expected = """
            class C
            {
                static void M()
                {
                    int x = 2;
                    const int {|Rename:V|} = 1;
                    Bar(x < V, (x > (2 + 3)));
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task TestInPartiallyHiddenMethod()
    {
        await TestInRegularAndScript1Async(
            """
            class Program
            {
            #line hidden
                void Main()
                {
            #line default
                    Goo([|1 + 1|]);
                }
            }
            """,
            """
            class Program
            {
            #line hidden
                void Main()
                {
            #line default
                    Goo(V);
                }
 
                private const int {|Rename:V|} = 1 + 1;
            }
            """, parameters: new TestParameters(TestOptions.Regular));
    }
 
    [Fact]
    public async Task TestInVisibleMethod()
    {
        await TestInRegularAndScriptAsync(
            """
            #line hidden
            class Program
            {
            #line default
                void Main()
                {
                    Goo([|1 + 1|]);
                }
            #line hidden
            }
            #line default
            """,
            """
            #line hidden
            class Program
            {
            #line default
                void Main()
                {
                    const int {|Rename:V|} = 1 + 1;
                    Goo(V);
                }
            #line hidden
            }
            #line default
            """);
    }
 
    [Fact]
    public async Task TestMissingInFieldInPartiallyHiddenType()
    {
        await TestMissingAsync(
            """
            class Program
            {
                int i = [|1 + 1|];
 
            #line hidden
            }
            #line default
            """, new TestParameters(TestOptions.Regular));
    }
 
    [Fact]
    public async Task TestMissingInAttributeInPartiallyHiddenType()
    {
        await TestMissingAsync(
            """
            [Goo([|1 + 1|])]
            class Program
            {
            #line hidden
            }
            #line default
            """, new TestParameters(TestOptions.Regular));
    }
 
    [Fact]
    public async Task TestMissingInConstructorInitializerInPartiallyHiddenType()
    {
        await TestMissingAsync(
            """
            class Program
            {
                public Program() : this([|1 + 1|])
                {
                }
 
            #line hidden
            }
            #line default
            """, new TestParameters(TestOptions.Regular));
    }
 
    [Fact]
    public async Task TestMissingInParameterInPartiallyHiddenType()
    {
        await TestMissingAsync(
            """
            class Program
            {
                public Program(int i = [|1 + 1|])
                {
                }
 
            #line hidden
            }
            #line default
            """, new TestParameters(TestOptions.Regular));
    }
 
    [Fact]
    public async Task TestMissingInQueryInPartiallyHiddenType()
    {
        await TestMissingAsync(
            """
            using System.Linq;
 
            class Program
            {
                public Program(string[] args)
                {
                    var q = from x in args
            #line hidden
                            let z = 1
            #line default
                            select [|x + x|];
                }
            }
            """, new TestParameters(TestOptions.Regular));
    }
 
    [Fact]
    public async Task TestInVisibleQueryInHiddenType()
    {
        await TestAsync(
            """
            #line hidden
            using System.Linq;
 
            class Program
            {
                public Program(string[] args)
                {
                    var q =
            #line default
                        from x in args
                        let z = 1
                        select [|x + x|];
            #line hidden
                }
            }
            #line default
            """,
            """
            #line hidden
            using System.Linq;
 
            class Program
            {
                public Program(string[] args)
                {
                    var q =
            #line default
                        from x in args
                        let z = 1
                        let {|Rename:v|} = x + x
                        select v;
            #line hidden
                }
            }
            #line default
            """,
parseOptions: TestOptions.Regular);
    }
 
    [Fact]
    public async Task TestMissingOnNamespace()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            class Program
            {
                void Main()
                {
                    [|System|].Console.WriteLine(4);
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestMissingOnType()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            class Program
            {
                void Main()
                {
                    [|System.Console|].WriteLine(4);
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestMissingOnBase()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            class Program
            {
                void Main()
                {
                    [|base|].ToString();
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestVenusGeneration1()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            class Program
            {
                void Main()
                {
            #line 1 "goo"
                    Console.WriteLine([|5|]);
            #line default
            #line hidden
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestVenusGeneration2()
    {
        var code =
            """
            class Program
            {
                void Main ( )
                {
            #line 1 "goo"
                    if (true)
                    {
                        Console.WriteLine([|5|]);
                    }
            #line default
            #line hidden
                }
            }
            """;
 
        await TestExactActionSetOfferedAsync(code, [string.Format(FeaturesResources.Introduce_local_constant_for_0, "5")]);
 
        await TestInRegularAndScriptAsync(code,
            """
            class Program
            {
                void Main ( )
                {
            #line 1 "goo"
                    if (true)
                    {
                        const int {|Rename:V|} = 5;
                        Console.WriteLine(V);
                    }
            #line default
            #line hidden
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestVenusGeneration3()
    {
        var code =
            """
            class Program
            {
            #line 1 "goo"
                void Main ( )
                {
                    if (true)
                    {
                        Console.WriteLine([|5|]);
                    }
                }
            #line default
            #line hidden
            }
            """;
 
        await TestExactActionSetOfferedAsync(code,
            [string.Format(FeaturesResources.Introduce_local_constant_for_0, "5"), string.Format(FeaturesResources.Introduce_local_constant_for_all_occurrences_of_0, "5")]);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/529795")]
    public async Task TestMissingOnNegatedLiteral()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            class A
            {
                void Main()
                {
                    long x = -[|9223372036854775808|];
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/546091")]
    public async Task TestNotOnInterfaceAttribute()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            [GuidAttribute([|"1A585C4D-3371-48dc-AF8A-AFFECC1B0967"|])]
            public interface I
            {
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/546095")]
    public async Task TestNotOnTypeOfInAttribute()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            using System.Runtime.InteropServices;
 
            [ComSourceInterfaces([|typeof(GuidAttribute)|])]
            public class Button
            {
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530109")]
    public async Task TestPreferGenerateConstantField1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void goo(string s = "Hello")
                {
                    var s2 = [|"Hello"|] + "World";
                }
            }
            """,
            """
            class C
            {
                private const string {|Rename:V|} = "Hello";
 
                void goo(string s = "Hello")
                {
                    var s2 = V + "World";
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530109")]
    public async Task TestPreferGenerateConstantField2()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void goo(string s = "Hello")
                {
                    var s2 = [|"Hello"|] + "World";
                }
            }
            """,
            """
            class C
            {
                private const string {|Rename:V|} = "Hello";
 
                void goo(string s = V)
                {
                    var s2 = V + "World";
                }
            }
            """,
index: 1);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530109")]
    public async Task TestPreferGenerateConstantField3()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void goo(string s = "Hello")
                {
                    var s2 = [|"Hello"|] + "World";
                }
            }
            """,
            """
            class C
            {
                void goo(string s = "Hello")
                {
                    const string {|Rename:V|} = "Hello";
                    var s2 = V + "World";
                }
            }
            """,
index: 2);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530109")]
    public async Task TestPreferGenerateConstantField4()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void goo(string s = "Hello")
                {
                    var s2 = [|"Hello"|] + "World";
                }
            }
            """,
            """
            class C
            {
                void goo(string s = "Hello")
                {
                    const string {|Rename:V|} = "Hello";
                    var s2 = V + "World";
                }
            }
            """,
index: 3);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530109")]
    public async Task TestNoGenerateConstantFieldIfAccessingLocal1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void goo(string s = "Hello")
                {
                    const string s1 = "World";
                    var s2 = [|"Hello" + s1|];
                }
            }
            """,
            """
            class C
            {
                void goo(string s = "Hello")
                {
                    const string s1 = "World";
                    const string {|Rename:V|} = "Hello" + s1;
                    var s2 = V;
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530109")]
    public async Task TestNoGenerateConstantFieldIfAccessingLocal2()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void goo(string s = "Hello")
                {
                    const string s1 = "World";
                    var s2 = [|"Hello" + s1|];
                }
            }
            """,
            """
            class C
            {
                void goo(string s = "Hello")
                {
                    const string s1 = "World";
                    const string {|Rename:V|} = "Hello" + s1;
                    var s2 = V;
                }
            }
            """,
index: 1);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530109")]
    public async Task TestNoGenerateConstantFieldIfNotAccessingLocal1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                const string s1 = "World";
 
                void goo(string s = "Hello")
                {
                    var s2 = [|"Hello" + s1|];
                }
            }
            """,
            """
            class C
            {
                const string s1 = "World";
                private const string {|Rename:V|} = "Hello" + s1;
 
                void goo(string s = "Hello")
                {
                    var s2 = V;
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530109")]
    public async Task TestNoGenerateConstantFieldIfNotAccessingLocal2()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                const string s1 = "World";
 
                void goo(string s = "Hello")
                {
                    var s2 = [|"Hello" + s1|];
                }
            }
            """,
            """
            class C
            {
                const string s1 = "World";
                private const string {|Rename:V|} = "Hello" + s1;
 
                void goo(string s = "Hello")
                {
                    var s2 = V;
                }
            }
            """,
index: 1);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530109")]
    public async Task TestNoGenerateConstantFieldIfNotAccessingLocal3()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                const string s1 = "World";
 
                void goo(string s = "Hello")
                {
                    var s2 = [|"Hello" + s1|];
                }
            }
            """,
            """
            class C
            {
                const string s1 = "World";
 
                void goo(string s = "Hello")
                {
                    const string {|Rename:V|} = "Hello" + s1;
                    var s2 = V;
                }
            }
            """,
index: 2);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530109")]
    public async Task TestNoGenerateConstantFieldIfNotAccessingLocal4()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                const string s1 = "World";
 
                void goo(string s = "Hello")
                {
                    var s2 = [|"Hello" + s1|];
                }
            }
            """,
            """
            class C
            {
                const string s1 = "World";
 
                void goo(string s = "Hello")
                {
                    const string {|Rename:V|} = "Hello" + s1;
                    var s2 = V;
                }
            }
            """,
index: 3);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/606347")]
    public async Task InsertNeededCast1()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            static class C
            {
                static void Inner(Action<string> x, string y) { }
                static void Inner(Action<string> x, int y) { }
                static void Inner(Action<int> x, int y) { }
 
                static void Outer(Action<string> x, object y) { Console.WriteLine(1); }
                static void Outer(Action<int> x, string y) { Console.WriteLine(2); }
 
                static T Goo<T>(T x) { return x; }
 
                static void Main()
                {
                    Outer(y => Inner(x => { [|Goo(x)|].ToString(); }, y), null);
                }
            }
            """,
 
            """
            using System;
 
            static class C
            {
                static void Inner(Action<string> x, string y) { }
                static void Inner(Action<string> x, int y) { }
                static void Inner(Action<int> x, int y) { }
 
                static void Outer(Action<string> x, object y) { Console.WriteLine(1); }
                static void Outer(Action<int> x, string y) { Console.WriteLine(2); }
 
                static T Goo<T>(T x) { return x; }
 
                static void Main()
                {
                    Outer(y => Inner(x => { var {|Rename:v|} = Goo(x); v.ToString(); }, y), null);
                }
            }
            """,
 
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/606347")]
    public async Task InsertNeededCast1NotVar()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            static class C
            {
                static void Inner(Action<string> x, string y) { }
                static void Inner(Action<string> x, int y) { }
                static void Inner(Action<int> x, int y) { }
 
                static void Outer(Action<string> x, object y) { Console.WriteLine(1); }
                static void Outer(Action<int> x, string y) { Console.WriteLine(2); }
 
                static T Goo<T>(T x) { return x; }
 
                static void Main()
                {
                    Outer(y => Inner(x => { [|Goo(x)|].ToString(); }, y), null);
                }
            }
            """,
 
            """
            using System;
 
            static class C
            {
                static void Inner(Action<string> x, string y) { }
                static void Inner(Action<string> x, int y) { }
                static void Inner(Action<int> x, int y) { }
 
                static void Outer(Action<string> x, object y) { Console.WriteLine(1); }
                static void Outer(Action<int> x, string y) { Console.WriteLine(2); }
 
                static T Goo<T>(T x) { return x; }
 
                static void Main()
                {
                    Outer(y => Inner(x => { string {|Rename:v|} = Goo(x); v.ToString(); }, y), (object)null);
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/606347"), WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/714632")]
    public async Task InsertNeededCast2()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                static void Main()
                {
                    byte z = 0;
                    Goo([|x => 0|], y => 0, z, z);
                }
 
                static void Goo<T, S>(Func<S, T> p, Func<T, S> q, T r, S s) { Console.WriteLine(1); }
                static void Goo(Func<byte, byte> p, Func<byte, byte> q, int r, int s) { Console.WriteLine(2); }
            }
            """,
 
            """
            using System;
 
            class Program
            {
                static void Main()
                {
                    byte z = 0;
                    Func<byte, byte> {|Rename:p|} = x => 0;
                    Goo(p, y => (byte)0, z, z);
                }
 
                static void Goo<T, S>(Func<S, T> p, Func<T, S> q, T r, S s) { Console.WriteLine(1); }
                static void Goo(Func<byte, byte> p, Func<byte, byte> q, int r, int s) { Console.WriteLine(2); }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/546512")]
    public async Task TestInSwitchSection()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Program
            {
                int Main(int i)
                {
                    switch (1)
                    {
                        case 0:
                            var f = Main([|1 + 1|]);
                            Console.WriteLine(f);
                    }
                }
            }
            """,
            """
            using System;
            class Program
            {
                int Main(int i)
                {
                    switch (1)
                    {
                        case 0:
                            const int {|Rename:I|} = 1 + 1;
                            var f = Main(I);
                            Console.WriteLine(f);
                    }
                }
            }
            """,
index: 2);
    }
 
    [Fact]
    public async Task TestInSwitchSection_AllOccurencesMultiStatement()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Program
            {
                int Main(int i)
                {
                    switch (1)
                    {
                        case 0:
                            var f = Main([|1 + 1|]);
                            var g = Main(1 + 1);
                        case 1:
                            Console.WriteLine(1 + 0);
                    }
                }
            }
            """,
            """
            using System;
            class Program
            {
                int Main(int i)
                {
                    switch (1)
                    {
                        case 0:
                            const int {|Rename:I|} = 1 + 1;
                            var f = Main(I);
                            var g = Main(I);
                        case 1:
                            Console.WriteLine(1 + 0);
                    }
                }
            }
            """,
index: 3);
    }
 
    [Fact]
    public async Task TestInSwitchSection_AllOccurencesDifferentSections()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Program
            {
                int Main(int i)
                {
                    switch (1)
                    {
                        case 0:
                            var f = Main([|1 + 1|]);
                            var g = Main(1 + 1);
                        case 1:
                            Console.WriteLine(1 + 1);
                    }
                }
            }
            """,
            """
            using System;
            class Program
            {
                int Main(int i)
                {
                    const int {|Rename:I|} = 1 + 1;
                    switch (1)
                    {
                        case 0:
                            var f = Main(I);
                            var g = Main(I);
                        case 1:
                            Console.WriteLine(I);
                    }
                }
            }
            """,
index: 3);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530480")]
    public async Task TestLambdaParameter1()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                static void Main(string[] args)
                {
                    Func<int, int> f = x => [|x + 1|];
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                static void Main(string[] args)
                {
                    Func<int, int> f = x =>
                    {
                        var {|Rename:v|} = x + 1;
                        return v;
                    };
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530480")]
    public async Task TestLambdaParameter2()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                static void Main(string[] args)
                {
                    Func<int, Func<int, int>> f = x => y => [|x + 1|];
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                static void Main(string[] args)
                {
                    Func<int, Func<int, int>> f = x => y =>
                    {
                        var {|Rename:v|} = x + 1;
                        return v;
                    };
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530480")]
    public async Task TestLambdaParameter3()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                static void Main(string[] args)
                {
                    Func<int, Func<int, int>> f = x => y => [|y + 1|];
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                static void Main(string[] args)
                {
                    Func<int, Func<int, int>> f = x => y =>
                    {
                        var {|Rename:v|} = y + 1;
                        return v;
                    };
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530480")]
    public async Task TestLambdaParameter4()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                static void Main(string[] args)
                {
                    Func<int, Func<int, int>> f = x => [|y => y + 1|];
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                static void Main(string[] args)
                {
                    Func<int, Func<int, int>> f = x =>
                    {
                        Func<int, int> {|Rename:value|} = y => y + 1;
                        return value;
                    };
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530480")]
    public async Task TestLambdaParameter5()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                static void Main(string[] args)
                {
                    Func<int, Func<int, int>> f = x => [|y => x + 1|];
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                static void Main(string[] args)
                {
                    Func<int, Func<int, int>> f = x =>
                    {
                        Func<int, int> {|Rename:value|} = y => x + 1;
                        return value;
                    };
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530721")]
    public async Task TestIntroVarInAction1()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                void M()
                {
                    Action<int> goo = x => [|x.ToString()|];
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                void M()
                {
                    Action<int> goo = x =>
                    {
                        string {|Rename:v|} = x.ToString();
                    };
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530919")]
    public async Task TestNullableOfPointerType()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                static void Main()
                {
                    [|new Nullable<int*>()|].GetValueOrDefault();
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                static void Main()
                {
                    var {|Rename:v|} = new Nullable<int*>();
                    v.GetValueOrDefault();
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/530919")]
    public async Task TestNullableOfPointerTypeNotVar()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                static void Main()
                {
                    [|new Nullable<int*>()|].GetValueOrDefault();
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                static void Main()
                {
                    Nullable<int*> {|Rename:v|} = new Nullable<int*>();
                    v.GetValueOrDefault();
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/830885")]
    public async Task TestIntroduceLocalRemovesUnnecessaryCast()
    {
        await TestInRegularAndScriptAsync(
            """
            using System.Collections.Generic;
 
            class C
            {
                static void Main(string[] args)
                {
                    var set = new HashSet<string>();
                    set.Add([|set.ToString()|]);
                }
            }
            """,
            """
            using System.Collections.Generic;
 
            class C
            {
                static void Main(string[] args)
                {
                    var set = new HashSet<string>();
                    var {|Rename:item|} = set.ToString();
                    set.Add(item);
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/655498")]
    public async Task HandleParenthesizedExpression()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    ([|(C.Bar)|].Invoke)();
                }
 
                static Action Bar;
            }
            """,
 
            """
            using System;
 
            class C
            {
                void Goo()
                {
                    Action {|Rename:bar|} = (C.Bar);
                    bar.Invoke();
                }
 
                static Action Bar;
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/682683")]
    public async Task DoNotRemoveParenthesesIfOperatorPrecedenceWouldBeBroken()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                static void Main()
                {
                    Console.WriteLine(5 - ([|1|] + 2));
                }
            }
            """,
 
            """
            using System;
 
            class Program
            {
                static void Main()
                {
                    const int {|Rename:V|} = 1;
                    Console.WriteLine(5 - (V + 2));
                }
            }
            """,
index: 2);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/828108")]
    public async Task UseNewSemanticModelForSimplification()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Collections.Generic;
            using System.Linq;
            using System.Threading.Tasks;
 
            class Program
            {
                static void Main(string[] args)
                {
                    var d = new Dictionary<string, Exception>();
                    d.Add("a", [|new Exception()|]);
                }
            }
            """,
 
            """
            using System;
            using System.Collections.Generic;
            using System.Linq;
            using System.Threading.Tasks;
 
            class Program
            {
                static void Main(string[] args)
                {
                    var d = new Dictionary<string, Exception>();
                    var {|Rename:value|} = new Exception();
                    d.Add("a", value);
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/884961")]
    public async Task TestInCollectionInitializer()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Collections.Generic;
            class C
            {
                void M()
                {
                    var l = new List<int>() { [|Environment.TickCount|] };
                }
            }
            """,
            """
            using System;
            using System.Collections.Generic;
            class C
            {
                void M()
                {
                    var {|Rename:tickCount|} = Environment.TickCount;
                    var l = new List<int>() { tickCount };
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/884961")]
    public async Task TestInCollectionInitializerNoVar()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Collections.Generic;
            class C
            {
                void M()
                {
                    var l = new List<int>() { [|Environment.TickCount|] };
                }
            }
            """,
            """
            using System;
            using System.Collections.Generic;
            class C
            {
                void M()
                {
                    int {|Rename:tickCount|} = Environment.TickCount;
                    var l = new List<int>() { tickCount };
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/854662")]
    public async Task TestInNestedCollectionInitializers()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Collections.Generic;
            class C
            {
                public Dictionary<int, int> A { get; private set; }
                static int Main(string[] args)
                {
                    int a = 0;
                    return new Program { A = { { [|a + 2|], 0 } } }.A.Count;
                }
            }
            """,
            """
            using System;
            using System.Collections.Generic;
            class C
            {
                public Dictionary<int, int> A { get; private set; }
                static int Main(string[] args)
                {
                    int a = 0;
                    var {|Rename:v|} = a + 2;
                    return new Program { A = { { v, 0 } } }.A.Count;
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/884961")]
    public async Task TestInArrayInitializer()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Collections.Generic;
            class C
            {
                void M()
                {
                    var a = new int[] { [|Environment.TickCount|] };
                }
            }
            """,
            """
            using System;
            using System.Collections.Generic;
            class C
            {
                void M()
                {
                    var {|Rename:tickCount|} = Environment.TickCount;
                    var a = new int[] { tickCount };
                }
            }
            """,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/884961")]
    public async Task TestInArrayInitializerWithoutVar()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Collections.Generic;
            class C
            {
                void M()
                {
                    var a = new int[] { [|Environment.TickCount|] };
                }
            }
            """,
            """
            using System;
            using System.Collections.Generic;
            class C
            {
                void M()
                {
                    int {|Rename:tickCount|} = Environment.TickCount;
                    var a = new int[] { tickCount };
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1022447")]
    public async Task TestFormattingOfIntroduceLocal2()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class C
            {
                void M()
                {
                    var s = "Text";
                    var x = 42;
                    if ([|s.Length|].CompareTo(x) > 0 &&
                        s.Length.CompareTo(x) > 0)
                    {
                    }
                }
            }
            """,
            """
            using System;
            class C
            {
                void M()
                {
                    var s = "Text";
                    var x = 42;
                    var {|Rename:length|} = s.Length;
                    if (length.CompareTo(x) > 0 &&
                        length.CompareTo(x) > 0)
                    {
                    }
                }
            }
            """,
index: 1,
options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/939259")]
    public async Task TestIntroduceLocalWithTriviaInMultiLineStatements()
    {
        var code =
"""
class C
{
    void Goo()
    {
        var d = [|true|] // TODO: comment
            ? 1
            : 2;
    }
}
""";
 
        var expected =
"""
class C
{
    void Goo()
    {
        const bool {|Rename:V|} = true;
        var d = V // TODO: comment
            ? 1
            : 2;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 3);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/939259")]
    public async Task TestIntroduceLocalWithTriviaInMultiLineStatements2()
    {
        var code =
"""
class C
{
    void Goo()
    {
        var d = true
            ? 1
            : [|2|]; // TODO: comment
    }
}
""";
 
        var expected =
"""
class C
{
    void Goo()
    {
        const int {|Rename:V|} = 2;
        var d = true
            ? 1
            : V; // TODO: comment
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 3);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1064803")]
    public async Task TestIntroduceLocalInStringInterpolation()
    {
        var code =
"""
class C
{
    void Goo()
    {
        var s = $"Alpha Beta { [|int.Parse("12345")|] } Gamma";
    }
}
""";
 
        var expected =
"""
class C
{
    void Goo()
    {
        var {|Rename:v|} = int.Parse("12345");
        var s = $"Alpha Beta {v} Gamma";
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1037057")]
    public async Task TestIntroduceLocalWithBlankLine()
    {
        await TestInRegularAndScriptAsync("""
            class C
            {
                void M()
                {
                    int x = 5;
 
                    // comment
                    int y = [|(x + 5)|] * (x + 5);
                }
            }
            """, """
            class C
            {
                void M()
                {
                    int x = 5;
 
                    // comment
                    var {|Rename:v|} = (x + 5);
                    int y = v * (x + 5);
                }
            }
            """, options: ImplicitTypingEverywhere());
    }
 
    [Fact]
    public async Task TestIntroduceLocalWithBlankLine_AllOccurencesMultiStatement()
    {
        await TestInRegularAndScriptAsync("""
            class C
            {
                void M()
                {
                    int x = 5;
 
                    // comment
                    int y = [|(x + 5)|] * (x + 5);
                    int z = (x + 5);
                }
            }
            """, """
            class C
            {
                void M()
                {
                    int x = 5;
 
                    // comment
                    var {|Rename:v|} = (x + 5);
                    int y = v * v;
                    int z = v;
                }
            }
            """, options: ImplicitTypingEverywhere(), index: 1);
    }
 
    [Fact]
    public Task TestIntroduceLocal_NullableType_FlowStateNonNull()
    => TestInRegularAndScriptAsync("""
        #nullable enable
 
        class C
        {
            void M()
            {
                string? s = string.Empty;
                M2([|s|]);
            }
 
            void M2(string? s)
            {
            }
        }
        """, """
        #nullable enable
 
        class C
        {
            void M()
            {
                string? s = string.Empty;
                string {|Rename:s1|} = s;
                M2(s1);
            }
 
            void M2(string? s)
            {
            }
        }
        """);
 
    [Fact]
    public Task TestIntroduceLocal_NullableType_FlowStateNull()
    => TestInRegularAndScriptAsync("""
        #nullable enable
 
        class C
        {
            void M()
            {
                string? s = null;
                M2([|s|]);
            }
 
            void M2(string? s)
            {
            }
        }
        """, """
        #nullable enable
 
        class C
        {
            void M()
            {
                string? s = null;
                string? {|Rename:s1|} = s;
                M2(s1);
            }
 
            void M2(string? s)
            {
            }
        }
        """);
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1065661")]
    public async Task TestIntroduceVariableTextDoesntSpanLines1()
    {
        await TestSmartTagTextAsync(
            """
            class C
            {
                void M()
                {
                    var s = [|@"a
 
            b
            c"|];
                }
            }
            """,
string.Format(FeaturesResources.Introduce_local_constant_for_0, """
@"a b c"
"""),
index: 2);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1065661")]
    public async Task TestIntroduceVariableTextDoesntSpanLines2()
    {
        await TestSmartTagTextAsync(
            """
            class C
            {
                void M()
                {
                    var s = [|$@"a
 
            b
            c"|];
                }
            }
            """,
string.Format(FeaturesResources.Introduce_constant_for_0, """
$@"a b c"
"""));
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1097147")]
    public async Task TestSmartNameForNullablesInConditionalAccessExpressionContext()
    {
        var code =
"""
using System;
class C
{
    static void Goo(string s)
    {
        var l = [|s?.Length|] ?? 0;
    }
}
""";
 
        var expected =
"""
using System;
class C
{
    static void Goo(string s)
    {
        var {|Rename:length|} = s?.Length;
        var l = length ?? 0;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1097147")]
    public async Task TestSmartNameForNullablesInConditionalAccessExpressionContext2()
    {
        var code =
"""
using System;
class C
{
    static void Goo(string s)
    {
        var l = [|s?.ToLower()|] ?? string.Empty;
    }
}
""";
 
        var expected =
"""
using System;
class C
{
    static void Goo(string s)
    {
        var {|Rename:v|} = s?.ToLower();
        var l = v ?? string.Empty;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1097147")]
    public async Task TestSmartNameForNullablesInConditionalAccessExpressionContext3()
    {
        var code =
"""
using System;
class Program
{
    static void Main(string[] args)
    {
        A a = new A();
        var l = [|a?.Prop?.Length|] ?? 0;
    }
}
class A
{
    public B Prop { get; set; }
}
class B
{
    public int Length { get; set; }
}
""";
 
        var expected =
"""
using System;
class Program
{
    static void Main(string[] args)
    {
        A a = new A();
        var {|Rename:length|} = a?.Prop?.Length;
        var l = length ?? 0;
    }
}
class A
{
    public B Prop { get; set; }
}
class B
{
    public int Length { get; set; }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1097147")]
    public async Task TestSmartNameForNullablesInConditionalAccessExpressionContext4()
    {
        var code =
"""
using System;
class Program
{
    static void Main(string[] args)
    {
        A a = new A();
        var age = [|a?.Prop?.GetAge()|] ?? 0;
    }
}
class A
{
    public B Prop { get; set; }
}
class B
{
    int age;
    public int GetAge() { return age; }
}
""";
 
        var expected =
"""
using System;
class Program
{
    static void Main(string[] args)
    {
        A a = new A();
        var {|Rename:v|} = a?.Prop?.GetAge();
        var age = v ?? 0;
    }
}
class A
{
    public B Prop { get; set; }
}
class B
{
    int age;
    public int GetAge() { return age; }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestIntroduceFieldInExpressionBodiedMethod()
    {
        var code =
"""
using System;
class T
{
    int m;
    int M1() => [|1|] + 2 + 3 + m;
}
""";
 
        var expected =
"""
using System;
class T
{
    private const int {|Rename:V|} = 1;
    int m;
    int M1() => V + 2 + 3 + m;
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestIntroduceLocalInExpressionBodiedNonVoidMethod()
    {
        var code =
"""
using System;
class T
{
    int m;
    int M1() => [|1|] + 2 + 3 + m;
}
""";
 
        var expected =
"""
using System;
class T
{
    int m;
    int M1()
    {
        const int {|Rename:V|} = 1;
        return V + 2 + 3 + m;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/31012")]
    public async Task TestIntroduceLocalInArgumentList()
    {
        var code =
            """
            using System;
            public interface IResolver { int Resolve(); }
            public class Test
            {
                private void register(Func<IResolver, object> a) { }
                private void test(Func<int, object> factory)
                    => register(x => factory(
                        [|x.Resolve()|]
                    ));
            }
            """;
 
        var expected =
            """
            using System;
            public interface IResolver { int Resolve(); }
            public class Test
            {
                private void register(Func<IResolver, object> a) { }
                private void test(Func<int, object> factory)
                    => register(x =>
                    {
                        int {|Rename:arg|} = x.Resolve();
                        return factory(
                                    arg
                                );
                    });
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 0);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/24807")]
    public async Task TestIntroduceLocalInExpressionBodiedVoidMethod()
    {
        var code =
"""
using System;
class T
{
    int m;
    void M1() => Console.WriteLine([|1|] + 2 + 3 + m);
}
""";
 
        var expected =
"""
using System;
class T
{
    int m;
    void M1()
    {
        const int {|Rename:V|} = 1;
        Console.WriteLine(V + 2 + 3 + m);
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task TestIntroduceFieldInExpressionBodiedConstructor()
    {
        var code =
"""
using System;
class T
{
    int m;
    T() => Console.WriteLine([|1|] + 2 + 3 + m);
}
""";
 
        var expected =
"""
using System;
class T
{
    private const int {|Rename:V|} = 1;
    int m;
    T() => Console.WriteLine(V + 2 + 3 + m);
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/24807")]
    public async Task TestIntroduceLocalInExpressionBodiedConstructor()
    {
        var code =
"""
using System;
class T
{
    int m;
    T() => Console.WriteLine([|1|] + 2 + 3 + m);
}
""";
 
        var expected =
"""
using System;
class T
{
    int m;
    T()
    {
        const int {|Rename:V|} = 1;
        Console.WriteLine(V + 2 + 3 + m);
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task TestIntroduceFieldInExpressionBodiedDestructor()
    {
        var code =
"""
using System;
class T
{
    int m;
    ~T() => Console.WriteLine([|1|] + 2 + 3 + m);
}
""";
 
        var expected =
"""
using System;
class T
{
    private const int {|Rename:V|} = 1;
    int m;
    ~T() => Console.WriteLine(V + 2 + 3 + m);
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/24807")]
    public async Task TestIntroduceLocalInExpressionBodiedDestructor()
    {
        var code =
"""
using System;
class T
{
    int m;
    ~T() => Console.WriteLine([|1|] + 2 + 3 + m);
}
""";
 
        var expected =
"""
using System;
class T
{
    int m;
    ~T()
    {
        const int {|Rename:V|} = 1;
        Console.WriteLine(V + 2 + 3 + m);
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestIntroduceFieldInExpressionBodiedOperator()
    {
        var code =
"""
using System;
class Complex
{
    int real; int imaginary;
    public static Complex operator +(Complex a, Complex b) => a.Add(b.real + [|1|]);
 
    private Complex Add(int b)
    {
        throw new NotImplementedException();
    }
}
""";
 
        var expected =
"""
using System;
class Complex
{
    private const int {|Rename:V|} = 1;
    int real; int imaginary;
    public static Complex operator +(Complex a, Complex b) => a.Add(b.real + V);
 
    private Complex Add(int b)
    {
        throw new NotImplementedException();
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestIntroduceLocalInExpressionBodiedOperator()
    {
        var code =
"""
using System;
class Complex
{
    int real; int imaginary;
    public static Complex operator +(Complex a, Complex b) => a.Add([|b.real + 1|]);
 
    private Complex Add(int b)
    {
        throw new NotImplementedException();
    }
}
""";
 
        var expected =
"""
using System;
class Complex
{
    int real; int imaginary;
    public static Complex operator +(Complex a, Complex b)
    {
        var {|Rename:b1|} = b.real + 1;
        return a.Add(b1);
    }
 
    private Complex Add(int b)
    {
        throw new NotImplementedException();
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestIntroduceFieldInExpressionBodiedConversionOperator()
    {
        var code =
"""
using System;
public struct DBBool
{
    public static readonly DBBool dbFalse = new DBBool(-1);
    int value;
 
    DBBool(int value)
    {
        this.value = value;
    }
 
    public static implicit operator DBBool(bool x) => x ? new DBBool([|1|]) : dbFalse;
}
""";
 
        var expected =
"""
using System;
public struct DBBool
{
    private const int {|Rename:Value|} = 1;
    public static readonly DBBool dbFalse = new DBBool(-1);
    int value;
 
    DBBool(int value)
    {
        this.value = value;
    }
 
    public static implicit operator DBBool(bool x) => x ? new DBBool(Value) : dbFalse;
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestIntroduceLocalInExpressionBodiedConversionOperator()
    {
        var code =
"""
using System;
public struct DBBool
{
    public static readonly DBBool dbFalse = new DBBool(-1);
    int value;
 
    DBBool(int value)
    {
        this.value = value;
    }
 
    public static implicit operator DBBool(bool x) => x ? new DBBool([|1|]) : dbFalse;
}
""";
 
        var expected =
"""
using System;
public struct DBBool
{
    public static readonly DBBool dbFalse = new DBBool(-1);
    int value;
 
    DBBool(int value)
    {
        this.value = value;
    }
 
    public static implicit operator DBBool(bool x)
    {
        const int {|Rename:Value|} = 1;
        return x ? new DBBool(Value) : dbFalse;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestIntroduceFieldInExpressionBodiedProperty()
    {
        var code =
"""
using System;
class T
{
    int M1 => [|1|] + 2;
}
""";
 
        var expected =
"""
using System;
class T
{
    private const int {|Rename:V|} = 1;
 
    int M1 => V + 2;
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestIntroduceLocalInExpressionBodiedProperty()
    {
        var code =
"""
using System;
class T
{
    int M1 => [|1|] + 2;
}
""";
 
        var expected =
"""
using System;
class T
{
    int M1
    {
        get
        {
            const int {|Rename:V|} = 1;
            return V + 2;
        }
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestIntroduceFieldInExpressionBodiedIndexer()
    {
        var code =
"""
using System;
class SampleCollection<T>
{
    private T[] arr = new T[100];
    public T this[int i] => i > [|0|] ? arr[i + 1] : arr[i + 2];
}
""";
 
        var expected =
"""
using System;
class SampleCollection<T>
{
    private const int {|Rename:V|} = 0;
    private T[] arr = new T[100];
    public T this[int i] => i > V ? arr[i + 1] : arr[i + 2];
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestIntroduceLocalInExpressionBodiedIndexer()
    {
        var code =
"""
using System;
class SampleCollection<T>
{
    private T[] arr = new T[100];
    public T this[int i] => i > 0 ? arr[[|i + 1|]] : arr[i + 2];
}
""";
 
        var expected =
"""
using System;
class SampleCollection<T>
{
    private T[] arr = new T[100];
    public T this[int i]
    {
        get
        {
            var {|Rename:v|} = i + 1;
            return i > 0 ? arr[v] : arr[i + 2];
        }
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, options: ImplicitTypingEverywhere());
    }
 
    [Fact]
    public async Task TestIntroduceFieldInExpressionBodiedPropertyGetter()
    {
        var code =
"""
using System;
class T
{
    int M1
    {
        get => [|1|] + 2;
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    private const int {|Rename:V|} = 1;
 
    int M1
    {
        get => V + 2;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestIntroduceLocalInExpressionBodiedPropertyGetter()
    {
        var code =
"""
using System;
class T
{
    int M1
    {
        get => [|1|] + 2;
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    int M1
    {
        get
        {
            const int {|Rename:V|} = 1;
            return V + 2;
        }
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task TestIntroduceFieldInExpressionBodiedPropertySetter()
    {
        var code =
"""
using System;
class T
{
    int M1
    {
        set => Console.WriteLine([|1|] + 2);
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    private const int {|Rename:V|} = 1;
 
    int M1
    {
        set => Console.WriteLine(V + 2);
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestIntroduceLocalInExpressionBodiedPropertySetter()
    {
        var code =
"""
using System;
class T
{
    int M1
    {
        set => Console.WriteLine([|1|] + 2);
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    int M1
    {
        set
        {
            const int {|Rename:V|} = 1;
            Console.WriteLine(V + 2);
        }
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task TestIntroduceFieldInExpressionBodiedIndexerGetter()
    {
        var code =
"""
using System;
class T
{
    int this[int i]
    {
        get => [|1|] + 2;
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    private const int {|Rename:V|} = 1;
 
    int this[int i]
    {
        get => V + 2;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestIntroduceLocalInExpressionBodiedIndexerGetter()
    {
        var code =
"""
using System;
class T
{
    int this[int i]
    {
        get => [|1|] + 2;
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    int this[int i]
    {
        get
        {
            const int {|Rename:V|} = 1;
            return V + 2;
        }
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task TestIntroduceFieldInExpressionBodiedIndexerSetter()
    {
        var code =
"""
using System;
class T
{
    int this[int i]
    {
        set => Console.WriteLine([|1|] + 2);
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    private const int {|Rename:V|} = 1;
 
    int this[int i]
    {
        set => Console.WriteLine(V + 2);
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestIntroduceLocalInExpressionBodiedIndexerSetter()
    {
        var code =
"""
using System;
class T
{
    int this[int i]
    {
        set => Console.WriteLine([|1|] + 2);
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    int this[int i]
    {
        set
        {
            const int {|Rename:V|} = 1;
            Console.WriteLine(V + 2);
        }
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task TestIntroduceFieldInExpressionBodiedEventAdder()
    {
        var code =
"""
using System;
class T
{
    event EventHandler E
    {
        add => Console.WriteLine([|1|] + 2);
        remove { }
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    private const int {|Rename:V|} = 1;
 
    event EventHandler E
    {
        add => Console.WriteLine(V + 2);
        remove { }
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestIntroduceLocalInExpressionBodiedEventAdder()
    {
        var code =
"""
using System;
class T
{
    event EventHandler E
    {
        add => Console.WriteLine([|1|] + 2);
        remove { }
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    event EventHandler E
    {
        add
        {
            const int {|Rename:V|} = 1;
            Console.WriteLine(V + 2);
        }
        remove { }
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task TestIntroduceFieldInExpressionBodiedEventRemover()
    {
        var code =
"""
using System;
class T
{
    event EventHandler E
    {
        add { }
        remove => Console.WriteLine([|1|] + 2);
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    private const int {|Rename:V|} = 1;
 
    event EventHandler E
    {
        add { }
        remove => Console.WriteLine(V + 2);
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestIntroduceLocalInExpressionBodiedEventRemover()
    {
        var code =
"""
using System;
class T
{
    event EventHandler E
    {
        add { }
        remove => Console.WriteLine([|1|] + 2);
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    event EventHandler E
    {
        add { }
        remove
        {
            const int {|Rename:V|} = 1;
            Console.WriteLine(V + 2);
        }
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task TestIntroduceFieldInExpressionBodiedLocalFunction()
    {
        var code =
"""
using System;
class T
{
    void M()
    {
        int F() => [|1|] + 2;
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    private const int {|Rename:V|} = 1;
 
    void M()
    {
        int F() => V + 2;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestIntroduceLocalInExpressionBodiedNonVoidLocalFunction()
    {
        var code =
"""
using System;
class T
{
    void M()
    {
        int F() => [|1|] + 2;
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    void M()
    {
        int F()
        {
            const int {|Rename:V|} = 1;
            return V + 2;
        }
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task TestIntroduceLocalInExpressionBodiedVoidLocalFunction()
    {
        var code =
"""
using System;
class T
{
    void M()
    {
        void F() => Console.WriteLine([|1|] + 2);
    }
}
""";
 
        var expected =
"""
using System;
class T
{
    void M()
    {
        void F()
        {
            const int {|Rename:V|} = 1;
            Console.WriteLine(V + 2);
        }
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestTrailingTriviaOnExpressionBodiedMethodRewrites()
    {
        var code =
"""
using System;
class T
{
    int M1() => 1 + 2 + [|3|] /*not moved*/; /*moved to end of block*/
 
    // rewrite should preserve newline above this.
    void Cat() { }
}
""";
 
        var expected =
"""
using System;
class T
{
    int M1()
    {
        const int {|Rename:V|} = 3;
        return 1 + 2 + V /*not moved*/;
    } /*moved to end of block*/
 
    // rewrite should preserve newline above this.
    void Cat() { }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestLeadingTriviaOnExpressionBodiedMethodRewrites()
    {
        var code =
"""
using System;
class T
{
    /*not moved*/
    int M1() => 1 + 2 + /*not moved*/ [|3|];
}
""";
 
        var expected =
"""
using System;
class T
{
    /*not moved*/
    int M1()
    {
        const int {|Rename:V|} = 3;
        return 1 + 2 + /*not moved*/ V;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestTriviaAroundArrowTokenInExpressionBodiedMemberSyntax()
    {
        var code =
"""
using System;
class T
{
    // comment
    int M1() /*c1*/ => /*c2*/ 1 + 2 + /*c3*/ [|3|];
}
""";
 
        var expected =
"""
using System;
class T
{
    // comment
    int M1() /*c1*/  /*c2*/
    {
        const int {|Rename:V|} = 3;
        return 1 + 2 + /*c3*/ V;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    [WorkItem("http://github.com/dotnet/roslyn/issues/971")]
    public async Task TestIntroduceLocalInExpressionBodiedMethodWithBlockBodiedAnonymousMethodExpression()
    {
        var code =
"""
using System;
class TestClass
{
    Func<int, int> Y() => delegate (int x)
    {
        return [|9|];
    };
}
""";
 
        var expected =
"""
using System;
class TestClass
{
    Func<int, int> Y() => delegate (int x)
    {
        const int {|Rename:V|} = 9;
        return V;
    };
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    [WorkItem("http://github.com/dotnet/roslyn/issues/971")]
    public async Task TestIntroduceLocalInExpressionBodiedMethodWithSingleLineBlockBodiedAnonymousMethodExpression()
    {
        var code =
"""
using System;
class TestClass
{
    Func<int, int> Y() => delegate (int x) { return [|9|]; };
}
""";
 
        var expected =
"""
using System;
class TestClass
{
    Func<int, int> Y() => delegate (int x) { const int {|Rename:V|} = 9; return V; };
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    [WorkItem("http://github.com/dotnet/roslyn/issues/971")]
    public async Task TestIntroduceLocalInExpressionBodiedMethodWithBlockBodiedSimpleLambdaExpression()
    {
        var code =
"""
using System;
class TestClass
{
    Func<int, int> Y() => f =>
    {
        return f * [|9|];
    };
}
""";
 
        var expected =
"""
using System;
class TestClass
{
    Func<int, int> Y() => f =>
    {
        const int {|Rename:V|} = 9;
        return f * V;
    };
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestIntroduceLocalInExpressionBodiedMethodWithExpressionBodiedSimpleLambdaExpression()
    {
        var code =
"""
using System;
class TestClass
{
    Func<int, int> Y() => f => f * [|9|];
}
""";
 
        var expected =
"""
using System;
class TestClass
{
    Func<int, int> Y() => f =>
    {
        const int {|Rename:V|} = 9;
        return f * V;
    };
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    [WorkItem("http://github.com/dotnet/roslyn/issues/971")]
    public async Task TestIntroduceLocalInExpressionBodiedMethodWithBlockBodiedParenthesizedLambdaExpression()
    {
        var code =
"""
using System;
class TestClass
{
    Func<int, int> Y() => (f) =>
    {
        return f * [|9|];
    };
}
""";
 
        var expected =
"""
using System;
class TestClass
{
    Func<int, int> Y() => (f) =>
    {
        const int {|Rename:V|} = 9;
        return f * V;
    };
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    public async Task TestIntroduceLocalInExpressionBodiedMethodWithExpressionBodiedParenthesizedLambdaExpression()
    {
        var code =
"""
using System;
class TestClass
{
    Func<int, int> Y() => (f) => f * [|9|];
}
""";
 
        var expected =
"""
using System;
class TestClass
{
    Func<int, int> Y() => (f) =>
    {
        const int {|Rename:V|} = 9;
        return f * V;
    };
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/528")]
    [WorkItem("http://github.com/dotnet/roslyn/issues/971")]
    public async Task TestIntroduceLocalInExpressionBodiedMethodWithBlockBodiedAnonymousMethodExpressionInMethodArgs()
    {
        var code =
"""
using System;
class TestClass
{
    public int Prop => Method1(delegate()
    {
        return [|8|];
    });
}
""";
 
        var expected =
"""
using System;
class TestClass
{
    public int Prop => Method1(delegate()
    {
        const int {|Rename:V|} = 8;
        return V;
    });
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/976")]
    public async Task TestNoConstantForInterpolatedStrings()
    {
        var code =
"""
using System;
class TestClass
{
    static void Test(string[] args)
    {
        Console.WriteLine([|$"{DateTime.Now.ToString()}Text{args[0]}"|]);
    }
}
""";
 
        var expected =
"""
using System;
class TestClass
{
    static void Test(string[] args)
    {
        var {|Rename:value|} = $"{DateTime.Now.ToString()}Text{args[0]}";
        Console.WriteLine(value);
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/976")]
    public async Task TestConstantForInterpolatedStrings()
    {
        var code =
"""
using System;
class TestClass
{
    static void Test(string[] args)
    {
        Console.WriteLine([|$"Text{{s}}"|]);
        Console.WriteLine($"Text{{s}}");
    }
}
""";
 
        var expected =
"""
using System;
class TestClass
{
    private const string {|Rename:Value|} = $"Text{{s}}";
 
    static void Test(string[] args)
    {
        Console.WriteLine(Value);
        Console.WriteLine(Value);
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact]
    public async Task TestConstantForInterpolatedStringsNested()
    {
        var code =
            """
            using System;
            class TestClass
            {
                static void Test(string[] args)
                {
                    Console.WriteLine([|$"{"Level 5"} {"Number 3"}"|]);
                    Console.WriteLine($"{"Level 5"} {"Number 3"}");
                }
            }
            """;
 
        var expected =
"""
using System;
class TestClass
{
    private const string {|Rename:Value|} = $"{"Level 5"} {"Number 3"}";
 
    static void Test(string[] args)
    {
        Console.WriteLine(Value);
        Console.WriteLine(Value);
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact]
    public async Task TestConstantForInterpolatedStringsInvalid()
    {
        var code =
"""
using System;
class TestClass
{
    static void Test(string[] args)
    {
        Console.WriteLine([|$"Text{0}"|]);
        Console.WriteLine($"Text{0}");
    }
}
""";
 
        var expected =
"""
using System;
class TestClass
{
    static void Test(string[] args)
    {
        var {|Rename:value|} = $"Text{0}";
        Console.WriteLine(value);
        Console.WriteLine(value);
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/909152")]
    public async Task TestMissingOnNullLiteral()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            class C1
            {
            }
 
            class C2
            {
            }
 
            class Test
            {
                void M()
                {
                    C1 c1 = [|null|];
                    C2 c2 = null;
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1130990")]
    public async Task InParentConditionalAccessExpressions()
    {
        var code =
"""
using System;
class C
{
    public T F<T>(T x)
    {
        var y = [|F(new C())|]?.F(new C())?.F(new C());
        return x;
    }
}
""";
 
        var expected =
"""
using System;
class C
{
    public T F<T>(T x)
    {
        var {|Rename:c|} = F(new C());
        var y = c?.F(new C())?.F(new C());
        return x;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1130990")]
    public async Task InParentConditionalAccessExpression2()
    {
        var code =
"""
using System;
class C
{
    public T F<T>(T x)
    {
        var y = [|F(new C()).F(new C())|]?.F(new C());
        return x;
    }
}
""";
 
        var expected =
"""
using System;
class C
{
    public T F<T>(T x)
    {
        var {|Rename:c|} = F(new C()).F(new C());
        var y = c?.F(new C());
        return x;
    }
}
""";
 
        await TestInRegularAndScriptAsync(code, expected, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1130990")]
    [WorkItem("https://github.com/dotnet/roslyn/issues/3110")]
    public async Task MissingAcrossMultipleParentConditionalAccessExpressions()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            using System;
 
            class C
            {
                public T F<T>(T x)
                {
                    var y = [|F(new C())?.F(new C())|]?.F(new C());
                    return x;
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1130990")]
    public async Task MissingOnInvocationExpressionInParentConditionalAccessExpressions()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            using System;
 
            class C
            {
                public T F<T>(T x)
                {
                    var y = F(new C())?.[|F(new C())|]?.F(new C());
                    return x;
                }
            }
            """);
    }
 
    [Fact, WorkItem("http://vstfdevdiv:8080/DevDiv2/DevDiv/_workitems/edit/1130990")]
    public async Task MissingOnMemberBindingExpressionInParentConditionalAccessExpressions()
    {
        await TestMissingInRegularAndScriptAsync(
            """
            using System;
 
            class C
            {
                static void Test(string s)
                {
                    var l = s?.[|Length|] ?? 0;
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/3147")]
    public async Task HandleFormattableStringTargetTyping1()
    {
        const string code = CodeSnippets.FormattableStringType + """
            namespace N
            {
                using System;
 
                class C
                {
                    public async Task M()
                    {
                        var f = FormattableString.Invariant([|$""|]);
                    }
                }
            }
            """;
 
        const string expected = CodeSnippets.FormattableStringType + """
            namespace N
            {
                using System;
 
                class C
                {
                    public async Task M()
                    {
                        FormattableString {|Rename:formattable|} = $"";
                        var f = FormattableString.Invariant(formattable);
                    }
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/49720")]
    public async Task HandleIFormattableTargetTyping1()
    {
        const string code = """
            namespace N
            {
                using System;
 
                class C
                {
                    public async Task M()
                    {
                        M([|$""|]);
                        void M(IFormattable f) {}
                    }
                }
            }
            """;
 
        const string expected = """
            namespace N
            {
                using System;
 
                class C
                {
                    public async Task M()
                    {
                        IFormattable {|Rename:f|} = $"";
                        M(f);
                        void M(IFormattable f) {}
                    }
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/936")]
    public async Task InAutoPropertyInitializer()
    {
        var code =
            """
            using System;
            class C
            {
                int Prop1 { get; } = [|1 + 2|];
            }
            """;
        var expected =
            """
            using System;
            class C
            {
                private const int {|Rename:V|} = 1 + 2;
 
                int Prop1 { get; } = V;
            }
            """;
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/936")]
    public async Task InAutoPropertyInitializer2()
    {
        var code =
            """
            using System;
            class C
            {
                public DateTime TimeStamp { get; } = [|DateTime.UtcNow|];
            }
            """;
        var expected =
            """
            using System;
            class C
            {
                private static readonly DateTime {|Rename:utcNow|} = DateTime.UtcNow;
 
                public DateTime TimeStamp { get; } = utcNow;
            }
            """;
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/936")]
    public async Task BlockContextPreferredOverAutoPropertyInitializerContext()
    {
        var code =
            """
            using System;
            class C
            {
                Func<int, int> X { get; } = a => { return [|7|]; };
            }
            """;
        var expected =
            """
            using System;
            class C
            {
                Func<int, int> X { get; } = a => { const int {|Rename:V|} = 7; return V; };
            }
            """;
        await TestInRegularAndScriptAsync(code, expected, index: 2);
    }
 
    [Fact]
    public async Task Tuple_TuplesDisabled()
    {
        var code =
            """
            class C
            {
                var i = [|(1, "hello")|].ToString();
            }
            """;
 
        var expected =
        """
        class C
        {
            private static readonly (int, string) {|Rename:value|} = (1, "hello");
            var i = value.ToString();
        }
        """;
 
        await TestAsync(code, expected, parseOptions: TestOptions.Regular.WithLanguageVersion(LanguageVersion.CSharp6));
    }
 
    [Fact]
    public async Task ElementOfTuple()
    {
        var code =
            """
            class C
            {
                var i = (1, [|"hello"|]).ToString();
            }
            """;
 
        var expected =
        """
        class C
        {
            private const string {|Rename:V|} = "hello";
            var i = (1, V).ToString();
        }
        """;
 
        await TestInRegularAndScriptAsync(
            code, expected);
    }
 
    [Fact]
    public async Task Tuple_IntroduceConstant()
    {
        var code =
            """
            class C
            {
                var i = [|(1, "hello")|].ToString();
            }
            """;
 
        var expected =
            """
            class C
            {
                private static readonly (int, string) {|Rename:value|} = (1, "hello");
                var i = value.ToString();
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TupleWithNames_IntroduceConstant()
    {
        var code =
            """
            class C
            {
                var i = [|(a: 1, b: "hello")|].ToString();
            }
            """;
 
        var expected =
            """
            class C
            {
                private static readonly (int a, string b) {|Rename:value|} = (a: 1, b: "hello");
                var i = value.ToString();
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task Tuple_IntroduceConstantForAllOccurrences()
    {
        var code =
            """
            class C
            {
                var i = [|(1, "hello")|].ToString() + (1, "hello").ToString();
            }
            """;
 
        var expected =
            """
            class C
            {
                private static readonly (int, string) {|Rename:value|} = (1, "hello");
                var i = value.ToString() + value.ToString();
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact]
    public async Task TupleWithNames_IntroduceConstantForAllOccurrences()
    {
        var code =
            """
            class C
            {
                var i = [|(a: 1, b: "hello")|].ToString() + (a: 1, b: "hello").ToString();
            }
            """;
 
        var expected =
            """
            class C
            {
                private static readonly (int a, string b) {|Rename:value|} = (a: 1, b: "hello");
                var i = value.ToString() + value.ToString();
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact]
    public async Task TupleWithDifferentNames_IntroduceConstantForAllOccurrences()
    {
        var code =
            """
            class C
            {
                var i = [|(a: 1, b: "hello")|].ToString() + (c: 1, d: "hello").ToString();
            }
            """;
 
        var expected =
            """
            class C
            {
                private static readonly (int a, string b) {|Rename:value|} = (a: 1, b: "hello");
                var i = value.ToString() + (c: 1, d: "hello").ToString();
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact]
    public async Task TupleWithOneName_IntroduceConstantForAllOccurrences()
    {
        var code =
            """
            class C
            {
                var i = [|(a: 1, "hello")|].ToString() + (a: 1, "hello").ToString();
            }
            """;
 
        var expected =
            """
            class C
            {
                private static readonly (int a, string) {|Rename:value|} = (a: 1, "hello");
                var i = value.ToString() + value.ToString();
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
 
        // no third action available
        await TestActionCountAsync(code, count: 2, parameters: new TestParameters(TestOptions.Regular));
    }
 
    [Fact]
    public async Task Tuple_IntroduceLocalForAllOccurrences()
    {
        // Cannot refactor tuple as local constant
        await TestActionCountAsync(
            """
            class C
            {
                void Goo()
                {
                    Bar([|(1, "hello")|]);
                    Bar((1, "hello");
                }
            }
            """, count: 2);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/11777")]
    public async Task TestGenerateLocalConflictingName1()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                class MySpan { public int Start { get; } public int End { get; } }
                void Method(MySpan span)
                {
                    int pos = span.Start;
                    while (pos < [|span.End|])
                    {
                        int spanEnd = span.End;
                        int end = pos;
                    }
                }
            }
            """,
            """
            class Program
            {
                class MySpan { public int Start { get; } public int End { get; } }
                void Method(MySpan span)
                {
                    int pos = span.Start;
                    int {|Rename:end1|} = span.End;
                    while (pos < end1)
                    {
                        int spanEnd = span.End;
                        int end = pos;
                    }
                }
            }
            """);
    }
 
    [Fact]
    public async Task TupleWithInferredName_LeaveExplicitName()
    {
        var code =
            """
            class C
            {
                static int y = 2;
                void M()
                {
                    int a = 1;
                    var t = (a, x: [|C.y|]);
                }
            }
            """;
 
        var expected =
        """
        class C
        {
            static int y = 2;
            void M()
            {
                int a = 1;
                int {|Rename:y1|} = C.y;
                var t = (a, x: y1);
            }
        }
        """;
 
        await TestAsync(code, expected, parseOptions: TestOptions.Regular.WithLanguageVersion(LanguageVersion.Latest));
    }
 
    [Fact]
    public async Task TupleWithInferredName_InferredNameBecomesExplicit()
    {
        var code =
            """
            class C
            {
                static int y = 2;
                void M()
                {
                    int x = 1;
                    var t = (x, [|C.y|]);
                }
            }
            """;
 
        var expected =
        """
        class C
        {
            static int y = 2;
            void M()
            {
                int x = 1;
                int {|Rename:y1|} = C.y;
                var t = (x, y: y1);
            }
        }
        """;
 
        await TestAsync(code, expected, parseOptions: TestOptions.Regular.WithLanguageVersion(LanguageVersion.Latest));
    }
 
    [Fact]
    public async Task TupleWithInferredName_AllOccurrences()
    {
        var code =
            """
            class C
            {
                static int y = 2;
                void M()
                {
                    int x = 1;
                    var t = (x, [|C.y|]);
                    var t2 = (C.y, x);
                }
            }
            """;
 
        var expected =
        """
        class C
        {
            static int y = 2;
            void M()
            {
                int x = 1;
                int {|Rename:y1|} = C.y;
                var t = (x, y: y1);
                var t2 = (y: y1, x);
            }
        }
        """;
        await TestAsync(code, expected, index: 1, parseOptions: TestOptions.Regular.WithLanguageVersion(LanguageVersion.Latest));
    }
 
    [Fact]
    public async Task TupleWithInferredName_NoDuplicateNames()
    {
        var code =
            """
            class C
            {
                static int y = 2;
                void M()
                {
                    int x = 1;
                    var t = (C.y, [|C.y|]);
                }
            }
            """;
 
        var expected =
        """
        class C
        {
            static int y = 2;
            void M()
            {
                int x = 1;
                int {|Rename:y1|} = C.y;
                var t = (y1, y1);
            }
        }
        """;
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact]
    public async Task AnonymousTypeWithInferredName_LeaveExplicitName()
    {
        var code =
            """
            class C
            {
                static int y = 2;
                void M()
                {
                    int a = 1;
                    var t = new { a, x= [|C.y|] };
                }
            }
            """;
 
        var expected =
        """
        class C
        {
            static int y = 2;
            void M()
            {
                int a = 1;
                int {|Rename:y1|} = C.y;
                var t = new { a, x= y1 };
            }
        }
        """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task AnonymousTypeWithInferredName_InferredNameBecomesExplicit()
    {
        var code =
            """
            class C
            {
                static int y = 2;
                void M()
                {
                    int x = 1;
                    var t = new { x, [|C.y|] };
                }
            }
            """;
 
        var expected =
        """
        class C
        {
            static int y = 2;
            void M()
            {
                int x = 1;
                int {|Rename:y1|} = C.y;
                var t = new { x, y = y1 };
            }
        }
        """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task AnonymousTypeWithInferredName_NoDuplicatesAllowed()
    {
        var code =
            """
            class C
            {
                static int y = 2;
                void M()
                {
                    int x = 1;
                    var t = new { C.y, [|C.y|] }; // this is an error already
                }
            }
            """;
 
        var expected =
        """
        class C
        {
            static int y = 2;
            void M()
            {
                int x = 1;
                int {|Rename:y1|} = C.y;
                var t = new { y = y1, y = y1 }; // this is an error already
            }
        }
        """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/31795")]
    public async Task TestInAnonymousObjectMemberDeclaratorWithInferredType()
    {
        var code =
            """
            using System;
            using System.Collections.Generic;
            using System.Linq;
 
            class C
            {
                void Test(Dictionary<int, List<Guid>> d)
                {
                    _ = new
                    {
                        a = [|d.Values|].Where(l => l.Count == 1)
                    };
                }
            }
            """;
 
        var expected =
            """
            using System;
            using System.Collections.Generic;
            using System.Linq;
 
            class C
            {
                void Test(Dictionary<int, List<Guid>> d)
                {
                    Dictionary<int, List<Guid>>.ValueCollection {|Rename:values|} = d.Values;
                    _ = new
                    {
                        a = values.Where(l => l.Count == 1)
                    };
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/2423")]
    public async Task TestPickNameBasedOnArgument1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                public C(string a, string b)
                {
                    new TextSpan([|int.Parse(a)|], int.Parse(b));
                }
            }
 
            struct TextSpan
            {
                public TextSpan(int start, int length)
                {
 
                }
            }
            """,
            """
            class C
            {
                public C(string a, string b)
                {
                    int {|Rename:start|} = int.Parse(a);
                    new TextSpan(start, int.Parse(b));
                }
            }
 
            struct TextSpan
            {
                public TextSpan(int start, int length)
                {
 
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/2423")]
    public async Task TestPickNameBasedOnArgument2()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                public C(string a, string b)
                {
                    new TextSpan(int.Parse(a), [|int.Parse(b)|]);
                }
            }
 
            struct TextSpan
            {
                public TextSpan(int start, int length)
                {
 
                }
            }
            """,
            """
            class C
            {
                public C(string a, string b)
                {
                    int {|Rename:length|} = int.Parse(b);
                    new TextSpan(int.Parse(a), length);
                }
            }
 
            struct TextSpan
            {
                public TextSpan(int start, int length)
                {
 
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/21665")]
    public async Task TestPickNameBasedOnValueTupleFieldName1()
    {
        await TestAsync(
            """
            using System;
 
            class C
            {
                public C(string a, string b)
                {
                    var tuple = (id: 1, date: [|DateTime.Now.ToString()|]);
                }
            }
            """,
            """
            using System;
 
            class C
            {
                public C(string a, string b)
                {
                    string {|Rename:date|} = DateTime.Now.ToString();
                    var tuple = (id: 1, date: date);
                }
            }
            """, parseOptions: TestOptions.Regular.WithLanguageVersion(LanguageVersion.Latest));
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/21665")]
    public async Task TestPickNameBasedOnValueTupleFieldName2()
    {
        await TestAsync(
            """
            using System;
 
            class C
            {
                public C()
                {
                    var tuple = (key: 1, value: [|1 + 1|]);
                }
            }
            """,
            """
            using System;
 
            class C
            {
                private const int {|Rename:Value|} = 1 + 1;
 
                public C()
                {
                    var tuple = (key: 1, value: Value);
                }
            }
            """, parseOptions: TestOptions.Regular.WithLanguageVersion(LanguageVersion.Latest), index: 0);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/21665")]
    public async Task TestPickNameBasedOnValueTupleFieldName3()
    {
        await TestAsync(
            """
            using System;
 
            class C
            {
                public C()
                {
                    var tuple = (key: 1, value: [|1 + 1|]);
                }
            }
            """,
            """
            using System;
 
            class C
            {
                public C()
                {
                    const int {|Rename:Value|} = 1 + 1;
                    var tuple = (key: 1, value: Value);
                }
            }
            """, parseOptions: TestOptions.Regular.WithLanguageVersion(LanguageVersion.Latest), index: 2);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/21373")]
    public async Task TestInAttribute()
    {
        await TestInRegularAndScriptAsync(
            """
            public class C
            {
                public string Goo { get; set; }
 
                [Example([|2+2|])]
                public string Bar { get; set; }
            }
            """,
            """
            public class C
            {
                private const int {|Rename:V|} = 2 + 2;
 
                public string Goo { get; set; }
 
                [Example(V)]
                public string Bar { get; set; }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/21687")]
    public async Task TestIfClassHasSameNameAsNamespace()
    {
        await TestInRegularAndScriptAsync(
            """
            namespace C
            {
                class C
                {
                    void M()
                    {
                        var t = new { foo = [|1 + 1|] };
                    }
                }
            }
            """,
            """
            namespace C
            {
                class C
                {
                    private const int {|Rename:V|} = 1 + 1;
 
                    void M()
                    {
                        var t = new { foo = V };
                    }
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/10123")]
    public async Task TestSimpleParameterName()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void M(int a)
                {
                    System.Console.Write([|a|]);
                }
            }
            """,
            """
            class C
            {
                void M(int a)
                {
                    int {|Rename:a1|} = a;
                    System.Console.Write(a1);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/10123")]
    public async Task TestSimpleParamterName_EmptySelection()
    {
        await TestMissingAsync(
            """
            class C
            {
                void M(int a)
                {
                    System.Console.Write([||]a);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/10123")]
    [WorkItem("https://github.com/dotnet/roslyn/issues/35525")]
    public async Task TestSimpleParamterName_SmallSelection()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void M(int parameter)
                {
                    System.Console.Write([|par|]ameter);
                }
            }
            """,
            """
            class C
            {
                void M(int parameter)
                {
                    int {|Rename:parameter1|} = parameter;
                    System.Console.Write(parameter1);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/10123")]
    public async Task TestFieldName_QualifiedWithThis()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                int a;
                void M()
                {
                    System.Console.Write([|this.a|]);
                }
            }
            """,
            """
            class C
            {
                int a;
                void M()
                {
                    int {|Rename:a1|} = this.a;
                    System.Console.Write(a1);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/10123")]
    public async Task TestFieldName_QualifiedWithType()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                static int a;
                void M()
                {
                    System.Console.Write([|C.a|]);
                }
            }
            """,
            """
            class C
            {
                static int a;
                void M()
                {
                    int {|Rename:a1|} = C.a;
                    System.Console.Write(a1);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/10123")]
    public async Task TestFieldName_QualifiedWithType_TinySelection1()
    {
        // While one might argue that offering the refactoring in this case is not strictly correct the selection expression is
        // unambiguous and there will be no other refactorings offered. Thus the cost of offering it very virtually non-existent.
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                static int a;
                void M()
                {
                    System.Console.Write(C[|.|]a);
                }
            }
            """,
            """
            class C
            {
                static int a;
                void M()
                {
                    int {|Rename:a1|} = C.a;
                    System.Console.Write(a1);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/10123")]
    public async Task TestFieldName_QualifiedWithType_TinySelection2()
    {
        await TestMissingAsync(
            """
            class C
            {
                static int a;
                void M()
                {
                    System.Console.Write([|C.|]a);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/10123")]
    public async Task TestFieldName_QualifiedWithType_TinySelection3()
    {
        await TestMissingAsync(
            """
            class C
            {
                static int a;
                void M()
                {
                    System.Console.Write(C.[|a|]);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/10123")]
    public async Task TestFieldName_QualifiedWithType_EmptySelection()
    {
        await TestMissingAsync(
            """
            class C
            {
                static int a;
                void M()
                {
                    System.Console.Write(C.[||]a);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/25990")]
    public async Task TestWithLineBreak()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void M()
                {
                    int x = [|
                        5 * 2 |]
                        ;
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 5 * 2;
 
                void M()
                {
                    int x =
                        V
                        ;
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/25990")]
    public async Task TestWithLineBreak_AfterExpression()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void M()
                {
                    int x =
            [|            5 * 2
            |]            ;
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 5 * 2;
 
                void M()
                {
                    int x =
                        V
                        ;
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/25990")]
    public async Task TestWithLineBreak_WithMultiLineComment()
    {
        await TestMissingAsync(
            """
            class C
            {
                void M()
                {
                    int x = // start [| comment
                        5 * 2 |]
                        ;
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/25990")]
    [WorkItem("https://github.com/dotnet/roslyn/issues/35525")]
    public async Task TestWithLineBreak_WithSingleLineComments()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void M()
                {
                    int x = /*comment1*/ [|
                        5 * 2 |]
                        ;
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 5 * 2;
 
                void M()
                {
                    int x = /*comment1*/
                        V
                        ;
                }
            }
            """
);
    }
 
    [Fact]
    public async Task TestIntroduceLocalInCallRefExpression()
    {
        // This test indicates that ref-expressions are l-values and
        // introduce local still introduces a local, not a ref-local.
        await TestInRegularAndScriptAsync("""
            class C
            {
                void M(int x)
                {
                    ref int y = ref x;
                    M2([|(y = ref x)|]);
                }
                void M2(int p) { }
            }
            """, """
            class C
            {
                void M(int x)
                {
                    ref int y = ref x;
                    int {|Rename:p|} = (y = ref x);
                    M2(p);
                }
                void M2(int p) { }
            }
            """);
    }
 
    [Fact]
    public async Task TestIntroduceLocalInRefCallRefExpression()
    {
        // Cannot extract expressions passed by ref
        await TestMissingInRegularAndScriptAsync("""
            class C
            {
                void M(int x)
                {
                    ref int y = ref x;
                    M2(ref [|(y = ref x)|]);
                }
                void M2(ref int p) { }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/28266")]
    public async Task TestCaretAtEndOfExpression1()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void Goo()
                {
                    Bar(1[||], 2);
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 1;
 
                void Goo()
                {
                    Bar(V, 2);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/28266")]
    public async Task TestCaretAtEndOfExpression2()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void Goo()
                {
                    Bar(1, 2[||]);
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 2;
 
                void Goo()
                {
                    Bar(1, V);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/28266")]
    public async Task TestCaretAtEndOfExpression3()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void Goo()
                {
                    Bar(1, (2[||]));
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = (2);
 
                void Goo()
                {
                    Bar(1, V);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/28266")]
    public async Task TestCaretAtEndOfExpression4()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void Goo()
                {
                    Bar(1, Bar(2[||]));
                }
            }
            """,
            """
            class C
            {
                private const int {|Rename:V|} = 2;
 
                void Goo()
                {
                    Bar(1, Bar(V));
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/27949")]
    public async Task TestWhitespaceSpanInAssignment()
    {
        await TestMissingAsync("""
            class C
            {
                int x = [| |] 0;
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/28665")]
    public async Task TestWhitespaceSpanInAttribute()
    {
        await TestMissingAsync("""
            class C
            {
                [Example( [| |] )]
                public void Goo()
                {
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/28941")]
    public async Task TestElementAccessExpression()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class C
            {
                byte[] getArray() => null;
                void test()
                {
                    var goo = [|getArray()|][0];
                }
            }
            """,
            """
            using System;
            class C
            {
                byte[] getArray() => null;
                void test()
                {
                    byte[] {|Rename:bytes|} = getArray();
                    var goo = bytes[0];
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestIndexExpression()
    {
        var code = TestSources.Index + """
            class Program
            {
                static void Main(string[] args)
                {
                    System.Console.WriteLine([|^1|]);
                }
            }
            """;
 
        var expected = TestSources.Index + """
            class Program
            {
                static void Main(string[] args)
                {
                    System.Index {|Rename:value|} = ^1;
                    System.Console.WriteLine(value);
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestRangeExpression_None()
    {
        var code = TestSources.Index + TestSources.Range + """
            class Program
            {
                static void Main(string[] args)
                {
                    System.Console.WriteLine([|..|]);
                }
            }
            """;
 
        var expected = TestSources.Index + TestSources.Range + """
            class Program
            {
                static void Main(string[] args)
                {
                    System.Range {|Rename:value|} = ..;
                    System.Console.WriteLine(value);
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestRangeExpression_Right()
    {
        var code = TestSources.Index + TestSources.Range + """
            class Program
            {
                static void Main(string[] args)
                {
                    System.Console.WriteLine([|..1|]);
                }
            }
            """;
 
        var expected = TestSources.Index + TestSources.Range + """
            class Program
            {
                static void Main(string[] args)
                {
                    System.Range {|Rename:value|} = ..1;
                    System.Console.WriteLine(value);
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestRangeExpression_Left()
    {
        var code = TestSources.Index + TestSources.Range + """
            class Program
            {
                static void Main(string[] args)
                {
                    System.Console.WriteLine([|1..|]);
                }
            }
            """;
 
        var expected = TestSources.Index + TestSources.Range + """
            class Program
            {
                static void Main(string[] args)
                {
                    System.Range {|Rename:value|} = 1..;
                    System.Console.WriteLine(value);
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact]
    public async Task TestRangeExpression_Both()
    {
        var code = TestSources.Index + TestSources.Range + """
            class Program
            {
                static void Main(string[] args)
                {
                    System.Console.WriteLine([|1..2|]);
                }
            }
            """;
 
        var expected = TestSources.Index + TestSources.Range + """
            class Program
            {
                static void Main(string[] args)
                {
                    System.Range {|Rename:value|} = 1..2;
                    System.Console.WriteLine(value);
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/30207")]
    public async Task TestImplicitRecursiveInstanceMemberAccess_ForAllOccurrences()
    {
        var code =
            """
            class C
            {
                C c;
                void Test()
                {
                    var x = [|c|].c.c;
                }
            }
            """;
 
        var expected =
            """
            class C
            {
                C c;
                void Test()
                {
                    C {|Rename:c1|} = c;
                    var x = c1.c.c;
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/30207")]
    public async Task TestExplicitRecursiveInstanceMemberAccess_ForAllOccurrences()
    {
        var code =
            """
            class C
            {
                C c;
                void Test()
                {
                    var x = [|this.c|].c.c;
                }
            }
            """;
 
        var expected =
            """
            class C
            {
                C c;
                void Test()
                {
                    C {|Rename:c1|} = this.c;
                    var x = c1.c.c;
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/30207")]
    public async Task TestExplicitInstanceMemberAccess_ForAllOccurrences()
    {
        var code =
            """
            class C
            {
                C c;
                void Test(C arg)
                {
                    var x = [|this.c|].Test(this.c);
                }
            }
            """;
 
        var expected =
            """
            class C
            {
                C c;
                void Test(C arg)
                {
                    C {|Rename:c1|} = this.c;
                    var x = c1.Test(c1);
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/30207")]
    public async Task TestImplicitInstanceMemberAccess_ForAllOccurrences()
    {
        var code =
            """
            class C
            {
                C c;
                void Test(C arg)
                {
                    var x = [|c|].Test(c);
                }
            }
            """;
 
        var expected =
            """
            class C
            {
                C c;
                void Test(C arg)
                {
                    C {|Rename:c1|} = c;
                    var x = c1.Test(c1);
                }
            }
            """;
 
        await TestInRegularAndScriptAsync(code, expected, index: 1);
    }
 
    [Fact, WorkItem("http://github.com/dotnet/roslyn/issues/30207")]
    public async Task TestExpressionOfUndeclaredType()
    {
        var code =
            """
            class C
            {
                void Test()
                {
                    A[] array = [|A|].Foo();
                    foreach (A a in array)
                    {
                    }
                }
            }
            """;
        await TestMissingAsync(code);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40209")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_Method()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                void M(int i)
                {
                    var x = i.ToString();
                    Local();
 
                    void Local()
                    {
                        var y = [|i.ToString();|]
                    }
                }
            }
            """,
            """
            class Program
            {
                void M(int i)
                {
                    var {|Rename:v|} = i.ToString();
                    var x = v;
                    Local();
 
                    void Local()
                    {
                        var y = v;
                    }
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40209")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_Property()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                public int TestProperty
                {
                    get => 10;
                    set
                    {
                        int i = 10;
                        var x = i.ToString();
                        Local();
 
                        void Local()
                        {
                            var y = [|i.ToString()|];
                        }
                    }
                }
            }
            """,
            """
            class Program
            {
                public int TestProperty
                {
                    get => 10;
                    set
                    {
                        int i = 10;
                        var {|Rename:v|} = i.ToString();
                        var x = v;
                        Local();
 
                        void Local()
                        {
                            var y = v;
                        }
                    }
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40209")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_ForLoop()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                public int TestProperty
                {
                    get => 10;
                    set
                    {
                        int i = 10;
                        var x = i.ToString();
                        Local();
 
                        void Local()
                        {
                            for (int j = 0; j < 5; j++)
                            {
                                var y = [|i.ToString();|]
                            }
                        }
                    }
                }
            }
            """,
            """
            class Program
            {
                public int TestProperty
                {
                    get => 10;
                    set
                    {
                        int i = 10;
                        var {|Rename:v|} = i.ToString();
                        var x = v;
                        Local();
 
                        void Local()
                        {
                            for (int j = 0; j < 5; j++)
                            {
                                var y = v;
                            }
                        }
                    }
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40209")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_NestedLocalFunction()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                void M(int i)
                {
                    var x = i.ToString();
                    Local();
 
                    void Local()
                    {
                        void Local()
                        {
                            var y = [|i.ToString();|]
                        }
                        var z = i.ToString();
                    }
                }
            }
            """,
            """
            class Program
            {
                void M(int i)
                {
                    var {|Rename:v|} = i.ToString();
                    var x = v;
                    Local();
 
                    void Local()
                    {
                        void Local()
                        {
                            var y = v;
                        }
                        var z = v;
                    }
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40209")]
    public async Task TestIntroduceFromStaticLocalFunction_AllOccurences_NestedLocalFunction()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                void M(int i)
                {
                    var x = i.ToString();
                    Local();
 
                    void Local()
                    {
                        static void Local()
                        {
                            var y = [|i.ToString();|]
                        }
                        var z = i.ToString();
                    }
                }
            }
            """,
            """
            class Program
            {
                void M(int i)
                {
                    var x = i.ToString();
                    Local();
 
                    void Local()
                    {
                        static void Local()
                        {
                            var {|Rename:v|} = i.ToString();
                            var y = v;
                        }
                        var z = i.ToString();
                    }
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40209")]
    public async Task TestIntroduceFromStaticLocalFunction_AllOccurences_Method()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                void M(int i)
                {
                    var x = Foo();
                    Local();
 
                    static void Local()
                    {
                        var y = [|Foo()|];
                    }
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                void M(int i)
                {
                    var x = Foo();
                    Local();
 
                    static void Local()
                    {
                        var {|Rename:v|} = Foo();
                        var y = v;
                    }
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40209")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_SingleMatch()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                void M(int i)
                {
                    Local();
 
                    void Local()
                    {
                        var y = [|i.ToString();|]
                    }
                }
            }
            """,
            """
            class Program
            {
                void M(int i)
                {
                    Local();
 
                    void Local()
                    {
                        var {|Rename:v|} = i.ToString();
                        var y = v;
                    }
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40209")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_MultipleMatches()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                void M(int i)
                {
                    Local();
 
                    void Local()
                    {
                        var x = [|i.ToString();|]
                        var y = i.ToString();
                    }
                }
            }
            """,
            """
            class Program
            {
                void M(int i)
                {
                    Local();
 
                    void Local()
                    {
                        var {|Rename:v|} = i.ToString();
                        var x = v;
                        var y = v;
                    }
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40209")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_MultipleMatches2()
    {
        await TestInRegularAndScriptAsync(
            """
            class Program
            {
                void M(int i)
                {
                    Local();
 
                    void Local()
                    {
                        var x = i.ToString();
                        var y = [|i.ToString();|]
                    }
                }
            }
            """,
            """
            class Program
            {
                void M(int i)
                {
                    Local();
 
                    void Local()
                    {
                        var {|Rename:v|} = i.ToString();
                        var x = v;
                        var y = v;
                    }
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40374")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_LocalFunctionCall()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    Local();
                    var x = Foo();
 
                    void Local()
                    {
                        var y = [|Foo();|]
                    }
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var {|Rename:v|} = Foo();
                    Local();
                    var x = v;
 
                    void Local()
                    {
                        var y = v;
                    }
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40374")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_LocalFunctionCall2()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    void Local()
                    {
                        var y = [|Foo();|]
                    }
 
                    Local();
                    var x = Foo();
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var {|Rename:v|} = Foo();
                    void Local()
                    {
                        var y = v;
                    }
 
                    Local();
                    var x = v;
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40374")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_LocalFunctionCall3()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var s = 5;
                    void Local()
                    {
                        var z = 10;
                        var y = [|Foo();|]
                    }
 
                    Local();
                    var x = Foo();
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var s = 5;
                    var {|Rename:v|} = Foo();
                    void Local()
                    {
                        var z = 10;
                        var y = v;
                    }
 
                    Local();
                    var x = v;
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40374")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_MultipleLocalFunctionCalls()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    Local();
                    var s = 5;
                    void Local()
                    {
                        var z = 10;
                        var y = [|Foo();|]
                    }
 
                    Local();
                    var x = Foo();
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var {|Rename:v|} = Foo();
                    Local();
                    var s = 5;
                    void Local()
                    {
                        var z = 10;
                        var y = v;
                    }
 
                    Local();
                    var x = v;
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40374")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_NestedLocalFunctionCalls()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M0()
                {
                    void M(int i)
                    {
                        Local();
                        var s = 5;
                        void Local()
                        {
                            var z = 10;
                            var y = [|Foo();|]
                        }
 
                        Local();
                        var x = Foo();
                    }
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M0()
                {
                    void M(int i)
                    {
                        var {|Rename:v|} = Foo();
                        Local();
                        var s = 5;
                        void Local()
                        {
                            var z = 10;
                            var y = v;
                        }
 
                        Local();
                        var x = v;
                    }
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40374")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_MultipleLocalFunctions()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    Local();
                    Local2();
                    var s = 5;
 
                    void Local2()
                    {
                        var w = Foo();
                    }
 
                    void Local()
                    {
                        var z = 10;
                        var y = [|Foo();|]
                    }
 
                    Local();
                    var x = Foo();
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var {|Rename:v|} = Foo();
                    Local();
                    Local2();
                    var s = 5;
 
                    void Local2()
                    {
                        var w = v;
                    }
 
                    void Local()
                    {
                        var z = 10;
                        var y = v;
                    }
 
                    Local();
                    var x = v;
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40374")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_MultipleLocalFunctions2()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var s = 5;
 
                    void Local2()
                    {
                        var w = Foo();
                    }
 
                    void Local()
                    {
                        var z = 10;
                        var y = [|Foo();|]
                    }
 
                    Local();
                    var x = Foo();
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var s = 5;
 
                    var {|Rename:v|} = Foo();
                    void Local2()
                    {
                        var w = v;
                    }
 
                    void Local()
                    {
                        var z = 10;
                        var y = v;
                    }
 
                    Local();
                    var x = v;
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40374")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_NoLocalFunctionCall()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var s = 5;
                    void Local()
                    {
                        var z = 10;
                        var y = [|Foo();|]
                    }
 
                    var x = Foo();
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var s = 5;
                    var {|Rename:v|} = Foo();
                    void Local()
                    {
                        var z = 10;
                        var y = v;
                    }
 
                    var x = v;
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40374")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_ExpressionBodiedLocalFunction()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    Local();
                    var s = 5;
                    object y;
                    void Local() => y = Foo();
 
                    var x = [|Foo();|]
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var {|Rename:v|} = Foo();
                    Local();
                    var s = 5;
                    object y;
                    void Local() => y = v;
 
                    var x = v;
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40374")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_ExpressionBodiedLocalFunction2()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var s = 5;
                    object y;
                    void Local() => y = Foo();
 
                    Local();
                    var x = [|Foo();|]
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var s = 5;
                    object y;
                    var {|Rename:v|} = Foo();
                    void Local() => y = v;
 
                    Local();
                    var x = v;
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40374")]
    public async Task TestIntroduceFromNonStaticLocalFunction_AllOccurences_SameMethodNames()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var c = new C();
                    c.Local();
 
                    this.Local();
 
                    Local();
                    void Local()
                    {
                        var y = [|Foo();|]
                    }
 
                    var x = Foo();
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
 
                private void Local()
                {
 
                }
            }
 
            class C
            {
                public void Local() { }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var c = new C();
                    c.Local();
 
                    this.Local();
 
                    var {|Rename:v|} = Foo();
                    Local();
                    void Local()
                    {
                        var y = v;
                    }
 
                    var x = v;
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
 
                private void Local()
                {
 
                }
            }
 
            class C
            {
                public void Local() { }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40381")]
    public async Task TestIntroduceFromMethod_AllOccurences_DoNotIncludeStaticLocalFunctionReferences()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    Local();
                    static void Local()
                    {
                        var y = Foo();
                    }
 
                    var x = [|Foo()|];
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    Local();
                    static void Local()
                    {
                        var y = Foo();
                    }
 
                    var {|Rename:v|} = Foo();
                    var x = v;
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40381")]
    public async Task TestIntroduceFromMethod_AllOccurences_DoNotIncludeStaticLocalFunctionReferences2()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var x = [|Foo()|];
                    Local();
                    static void Local()
                    {
                        var y = Foo();
                    }
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var {|Rename:v|} = Foo();
                    var x = v;
                    Local();
                    static void Local()
                    {
                        var y = Foo();
                    }
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40381")]
    public async Task TestIntroduceFromMethod_AllOccurences_IncludeNonStaticLocalFunctionReferences()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    Local();
                    void Local()
                    {
                        var y = Foo();
                    }
 
                    var x = [|Foo()|];
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """,
            """
            using System;
            class Bug
            {
                void M(int i)
                {
                    var {|Rename:v|} = Foo();
                    Local();
                    void Local()
                    {
                        var y = v;
                    }
 
                    var x = v;
                }
 
                private static object Foo()
                {
                    throw new NotImplementedException();
                }
            }
            """, index: 1, options: ImplicitTypingEverywhere());
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/561")]
    public async Task DoNotGenerateBetweenElseAndIf()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                static void Main(string[] args)
                {
                    if (true)
                    {
                    }
                    else if ([|args.Length|] == 0)
                    {
                    }
                }
            }
            """,
            """
            class C
            {
                static void Main(string[] args)
                {
                    int {|Rename:length|} = args.Length;
                    if (true)
                    {
                    }
                    else if (length == 0)
                    {
                    }
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/12591")]
    public async Task TestWhitespaceSelection1()
    {
        await TestInRegularAndScriptAsync(
            """
            public class Class1
            {
                void M()
                {
                    Foo(1,[| Bar()|]);
                }
 
                private void Foo(int v1, object v2)
                {
                }
 
                private object Bar()
                {
                }
            }
            """,
            """
            public class Class1
            {
                void M()
                {
                    object {|Rename:v2|} = Bar();
                    Foo(1, v2);
                }
 
                private void Foo(int v1, object v2)
                {
                }
 
                private object Bar()
                {
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/56")]
    public async Task TestGenerateNameForForeachExpression()
    {
        await TestInRegularAndScriptAsync(
            """
            using System.Collections.Generic;
 
            class Program
            {
                static void Main(string[] args)
                {
                    foreach (var num in [|GetNumbers()|])
                    {
 
                    }
                }
 
                static IEnumerable<int> GetNumbers()
                {
                    return new[] { 1, 2, 3 };
                }
            }
            """,
            """
            using System.Collections.Generic;
 
            class Program
            {
                static void Main(string[] args)
                {
                    IEnumerable<int> {|Rename:nums|} = GetNumbers();
                    foreach (var num in nums)
                    {
 
                    }
                }
 
                static IEnumerable<int> GetNumbers()
                {
                    return new[] { 1, 2, 3 };
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/15770")]
    public async Task TestKeepReplacementIndentation1()
    {
        await TestInRegularAndScriptAsync(
            """
            class D
            {
                void C(int a)
                {
                    C(
                        [|1 + 2|]);
                }
            }
            """,
            """
            class D
            {
                void C(int a)
                {
                    const int {|Rename:A|} = 1 + 2;
                    C(
                        A);
                }
            }
            """,
            index: 3);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40745")]
    public async Task TestKeepExistingNonTrivialCodeInLambda()
    {
        await TestInRegularAndScriptAsync(
            """
            using System.IO;
            using System.Threading.Tasks;
 
            class C
            {
                void M()
                {
                    Task.Run(() => File.Copy("src", [|Path.Combine("dir", "file")|]));
                }
            }
            """,
            """
            using System.IO;
            using System.Threading.Tasks;
 
            class C
            {
                void M()
                {
                    Task.Run(() =>
                    {
                        string {|Rename:destFileName|} = Path.Combine("dir", "file");
                        File.Copy("src", destFileName);
                    });
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40745")]
    public async Task TestIntroVarInActionSelectingInsideParens()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                void M()
                {
                    Action<int> goo = x => ([|x.ToString()|]);
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                void M()
                {
                    Action<int> goo = x =>
                    {
                        string {|Rename:v|} = x.ToString();
                    };
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40745")]
    public async Task TestIntroVarInActionSelectingParens()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class Program
            {
                void M()
                {
                    Action<int> goo = x => [|(x.ToString())|];
                }
            }
            """,
            """
            using System;
 
            class Program
            {
                void M()
                {
                    Action<int> goo = x =>
                    {
                        string {|Rename:v|} = (x.ToString());
                    };
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40745")]
    public async Task TestMissingReturnStatementInAsyncTaskMethod()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Threading.Tasks;
 
            class Program
            {
                void M()
                {
                    Func<int, Task> f = async x => await [|M2()|];
                }
 
                async Task M2()
                {
                }
            }
            """,
            """
            using System;
            using System.Threading.Tasks;
 
            class Program
            {
                void M()
                {
                    Func<int, Task> f = async x =>
                    {
                        Task {|Rename:task|} = M2();
                        await task;
                    };
                }
 
                async Task M2()
                {
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40745")]
    public async Task TestMissingReturnStatementInAsyncValueTaskMethod()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Threading.Tasks;
 
            namespace System.Threading.Tasks {
                struct ValueTask
                {
                }
            }
 
            class Program
            {
                void M()
                {
                    Func<int, ValueTask> f = async x => await [|M2()|];
                }
 
                async ValueTask M2()
                {
                }
            }
            """,
            """
            using System;
            using System.Threading.Tasks;
 
            namespace System.Threading.Tasks {
                struct ValueTask
                {
                }
            }
 
            class Program
            {
                void M()
                {
                    Func<int, ValueTask> f = async x =>
                    {
                        ValueTask {|Rename:valueTask|} = M2();
                        await valueTask;
                    };
                }
 
                async ValueTask M2()
                {
                }
            }
            """);
    }
 
    [Fact]
    public async Task TestReturnStatementInAsyncTaskTypeMethod()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Threading.Tasks;
 
            class Program
            {
                void M()
                {
                    Func<int, Task<int>> f = async x => await [|M2()|];
                }
 
                async Task<int> M2()
                {
                    return 0;
                }
            }
            """,
            """
            using System;
            using System.Threading.Tasks;
 
            class Program
            {
                void M()
                {
                    Func<int, Task<int>> f = async x =>
                    {
                        Task<int> {|Rename:task|} = M2();
                        return await task;
                    };
                }
 
                async Task<int> M2()
                {
                    return 0;
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/40745")]
    public async Task TestReturnStatementInAsyncValueTaskTypeMethod()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
            using System.Threading.Tasks;
 
            namespace System.Threading.Tasks {
                struct ValueTask<T>
                {
                }
            }
 
            class Program
            {
                void M()
                {
                    Func<int, ValueTask<int>> f = async x => await [|M2()|];
                }
 
                async ValueTask<int> M2()
                {
                    return 0;
                }
            }
            """,
            """
            using System;
            using System.Threading.Tasks;
 
            namespace System.Threading.Tasks {
                struct ValueTask<T>
                {
                }
            }
 
            class Program
            {
                void M()
                {
                    Func<int, ValueTask<int>> f = async x =>
                    {
                        ValueTask<int> {|Rename:valueTask|} = M2();
                        return await valueTask;
                    };
                }
 
                async ValueTask<int> M2()
                {
                    return 0;
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/44291")]
    public async Task TestIntroduceWithAmbiguousExtensionClass()
    {
        await TestInRegularAndScriptAsync(
            """
            <Workspace>
                <Project Language="C#" AssemblyName="Assembly1" Name="P1" CommonReferences="true">
                    <Document>
            public static class Extensions
            {
                public static void Goo(this string s) { }
            }
                    </Document>
                </Project>
                <Project Language="C#" AssemblyName="Assembly2" Name="P2" CommonReferences="true">
                    <Document>
            public static class Extensions
            {
                public static void Bar(this string s) { }
            }
                    </Document>
                </Project>
                <Project Language="C#" AssemblyName="Assembly3" Name="P3" CommonReferences="true">
                    <ProjectReference>P1</ProjectReference>
                    <ProjectReference>P2</ProjectReference>
                    <Document>public class P
            {
                public void M(string s)
                {
                    s.Bar([|$""|]);
                }
            }</Document>
                </Project>
            </Workspace>
            """,
            """
            public class P
            {
                private const string {|Rename:V|} = $"";
 
                public void M(string s)
                {
                    s.Bar(V);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/44656")]
    public async Task ImplicitObjectCreation()
    {
        await TestInRegularAndScriptAsync("""
            class A
            {
                public void Create(A a, B b)
                {
                }
            }
 
            class B
            {
                void M()
                {
                    new A().Create(new A(), [|new(1)|]);
                }
            }
            """, """
            class A
            {
                public void Create(A a, B b)
                {
                }
            }
 
            class B
            {
                void M()
                {
                    B {|Rename:b|} = new(1);
                    new A().Create(new A(), b);
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/52833")]
    public async Task UniqueParameterName()
    {
        await TestInRegularAndScriptAsync("""
            using System.IO;
 
            public class SomeClass
            {
                public void Foo()
                {
                    var somePath = Path.Combine("one", "two");
                    Other([|"someParam"|]);
                }
 
                public void Other(string path)
                {
                }
            }
            """,
            """
            using System.IO;
 
            public class SomeClass
            {
                public void Foo()
                {
                    var somePath = Path.Combine("one", "two");
                    const string {|Rename:Path1|} = "someParam";
                    Other(Path1);
                }
 
                public void Other(string path)
                {
                }
            }
            """, 2);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/47772")]
    public async Task DoNotIntroduceConstantForConstant_Local()
    {
        await TestMissingAsync(
            """
            class C
            {
                void M()
                {
                    const int foo = [|10|];
                }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/47772")]
    public async Task DoNotIntroduceConstantForConstant_Member()
    {
        await TestMissingAsync(
            """
            class C
            {
                const int foo = [|10|];
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/47772")]
    public async Task DoNotIntroduceConstantForConstant_Parentheses()
    {
        await TestMissingAsync(
            """
            class C
            {
                const int foo = ([|10|]);
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/47772")]
    public async Task DoNotIntroduceConstantForConstant_NotForSubExpression()
    {
        await TestInRegularAndScriptAsync(
            """
            class C
            {
                void M()
                {
                    const int foo = [|10|] + 10;
                }
            }
            """,
            """
            class C
            {
                void M()
                {
                    const int {|Rename:V|} = 10;
                    const int foo = V + 10;
                }
            }
            """,
        index: 2);
    }
 
    [Theory, Trait(Traits.Feature, Traits.Features.CodeActionsIntroduceLocalForExpression)]
    [WorkItem("https://github.com/dotnet/roslyn/issues/61796")]
    [InlineData("Task")]
    [InlineData("ValueTask")]
    public async Task IntroduceLocal_DoNotReturnForVoidTaskLikeTypes(string taskType)
    {
        await TestInRegularAndScriptAsync(
$$"""
using System;
using System.Threading.Tasks;
 
namespace ConsoleApp1
{
    internal class Example1
    {
        private async {{taskType}} DoStuff() => await ConsumeAsync([|await TransformAsync("abc")|]);
 
        private Task<object> TransformAsync(string v) => throw new NotImplementedException();
 
        private Task ConsumeAsync(object value) => throw new NotImplementedException();
    }
}
""" + ValueTaskDeclaration,
$$"""
using System;
using System.Threading.Tasks;
 
namespace ConsoleApp1
{
    internal class Example1
    {
        private async {{taskType}} DoStuff()
        {
            object {|Rename:value|} = await TransformAsync("abc");
            await ConsumeAsync(value);
        }
 
        private Task<object> TransformAsync(string v) => throw new NotImplementedException();
 
        private Task ConsumeAsync(object value) => throw new NotImplementedException();
    }
}
""" + ValueTaskDeclaration);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/28730")]
    public async Task TestOnThis1()
    {
        await TestMissingAsync(
            """
            sealed class C {
                readonly string s;
                public C(string s) {
                    [||]this.s = s;
                }
            }
            """);
    }
 
    [Fact]
    public async Task Lambda_OptionalParameters()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class C
            {
                void M()
                {
                    H((int x = 1, int y = 2) [||]=> x + y);
                }
 
                static void H(Delegate d) { }
            }
            """,
            """
            using System;
 
            class C
            {
                void M()
                {
                    var {|Rename:d|} = (int x = 1, int y = 2) => x + y;
                    H(d);
                }
 
                static void H(Delegate d) { }
            }
            """);
    }
 
    [Fact]
    public async Task Lambda_ParamsArray()
    {
        await TestInRegularAndScriptAsync(
            """
            using System;
 
            class C
            {
                void M()
                {
                    H((int x, params int[] xs) [||]=> xs.Length + x);
                }
 
                static void H(Delegate d) { }
            }
            """,
            """
            using System;
 
            class C
            {
                void M()
                {
                    var {|Rename:d|} = (int x, params int[] xs) => xs.Length + x;
                    H(d);
                }
 
                static void H(Delegate d) { }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/71042")]
    public async Task TestNotForArrayInAttribute()
    {
        await TestMissingAsync(
            """
            public class C
            {
                public string Goo { get; set; }
 
                [Example([|new int[] { 2+2 }|])]
                public string Bar { get; set; }
            }
            """);
    }
 
    [Fact, WorkItem("https://github.com/dotnet/roslyn/issues/71042")]
    public async Task TestNotForTypeofInAttribute()
    {
        await TestMissingAsync(
            """
            public class C
            {
                public string Goo { get; set; }
 
                [Example([|typeof(C)|])]
                public string Bar { get; set; }
            }
            """);
    }
}