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Cannot compile some condition of switch expression
See original GitHub issueThis issue has been moved from a ticket on Developer Community.
Related Developer Community post: https://developercommunity.visualstudio.com/content/problem/1161747/visual-studio-2019-professional-1672-doesnt-build.html
Duplicate issue: #46877 Duplicate issue: #46990 Duplicate issue: #46899 Duplicate issue: dotnet/core#5087 Duplicate issue: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1179705
[severity:I’m unable to use this version of Visual Studio] [regression] [worked-in:‘16.6.3’] Simply some switch expression code cannot be compiled due to compiler crash. I don’t know what conditions occur this, but I already have 100% repro code. Repro code is here:
using System;
namespace SwitchExpressionBug
{
public enum EnumA { A, B, C }
public enum EnumB { X, Y, Z }
public class Class1
{
public string Repro(EnumA a, EnumB b)
=> (a, b) switch
{
(EnumA.A, EnumB.X) => "AX",
(_, EnumB.Y) => "_Y",
(EnumA.B, EnumB.X) => "BZ",
(_, EnumB.Z) => "_Z",
(_, _) => throw new ArgumentException()
};
}
}
Visual Studio build result:
1>------ Rebuild All started: Project: SwitchExpressionBug, Configuration: Debug Any CPU ------
1>You are using a preview version of .NET. See: https://aka.ms/dotnet-core-preview
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Current\Bin\Roslyn\Microsoft.CSharp.Core.targets(59,5): error MSB6006: "csc.exe" exited with code -2146232797.
1>Done building project "SwitchExpressionBug.csproj" -- FAILED.
========== Rebuild All: 0 succeeded, 1 failed, 0 skipped ==========
.NET 5.0 SDK 5.0.100-preview.6.20318.15
$ dotnet build
Microsoft (R) Build Engine version 16.7.0-preview-20310-07+ee1c9fd0c for .NET
Copyright (C) Microsoft Corporation. All rights reserved.
Determining projects to restore...
All projects are up-to-date for restore.
You are using a preview version of .NET. See: https://aka.ms/dotnet-core-preview
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : Process terminated. System.NullReferenceException: Object reference not set to an instance of an object. [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.BasicBlock.ShortenBranches(Int32& delta) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.ComputeOffsetsAndAdjustBranches() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.RealizeBlocks() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.Realize() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.GenerateImpl() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.GenerateMethodBody(PEModuleBuilder moduleBuilder, MethodSymbol method, Int32 methodOrdinal, BoundStatement block, ImmutableArray`1 lambdaDebugInfo, ImmutableArray`1 closureDebugInfo, StateMachineTypeSymbol stateMachineTypeOpt, VariableSlotAllocator variableSlotAllocatorOpt, DiagnosticBag diagnostics, DebugDocumentProvider debugDocumentProvider, ImportChain importChainOpt, Boolean emittingPdb, Boolean emitTestCoverageData, ImmutableArray`1 dynamicAnalysisSpans, AsyncForwardEntryPoint entryPointOpt) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(MethodSymbol methodSymbol, Int32 methodOrdinal, ProcessedFieldInitializers& processedInitializers, SynthesizedSubmissionFields previousSubmissionFields, TypeCompilationState compilationState) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass22_0.<CompileNamedTypeAsync>b__0() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Environment.FailFast(System.String, System.Exception) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.FailFast.OnFatalException(System.Exception) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.FatalError.Report(System.Exception, System.Action`1<System.Exception>) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.FatalError.ReportUnlessCanceled(System.Exception) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler+<>c__DisplayClass22_0.<CompileNamedTypeAsync>b__0() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder+BasicBlock.ShortenBranches(Int32 ByRef) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.ComputeOffsetsAndAdjustBranches() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.RealizeBlocks() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.Realize() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.GenerateImpl() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.GenerateMethodBody(Microsoft.CodeAnalysis.CSharp.Emit.PEModuleBuilder, Microsoft.CodeAnalysis.CSharp.Symbols.MethodSymbol, Int32, Microsoft.CodeAnalysis.CSharp.BoundStatement, System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.CodeGen.LambdaDebugInfo>, System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.CodeGen.ClosureDebugInfo>, Microsoft.CodeAnalysis.CSharp.StateMachineTypeSymbol, Microsoft.CodeAnalysis.CodeGen.VariableSlotAllocator, Microsoft.CodeAnalysis.DiagnosticBag, Microsoft.CodeAnalysis.CodeGen.DebugDocumentProvider, Microsoft.CodeAnalysis.CSharp.ImportChain, Boolean, Boolean, System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.CodeGen.SourceSpan>, AsyncForwardEntryPoint) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(Microsoft.CodeAnalysis.CSharp.Symbols.MethodSymbol, Int32, ProcessedFieldInitializers ByRef, Microsoft.CodeAnalysis.CSharp.SynthesizedSubmissionFields, Microsoft.CodeAnalysis.CSharp.TypeCompilationState) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(Microsoft.CodeAnalysis.CSharp.Symbols.NamedTypeSymbol) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler+<>c__DisplayClass22_0.<CompileNamedTypeAsync>b__0() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Roslyn.Utilities.UICultureUtilities+<>c__DisplayClass5_0.<WithCurrentUICulture>b__0() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.Tasks.Task.InnerInvoke() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.Tasks.Task+<>c.<.cctor>b__276_0(System.Object) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(System.Threading.Thread, System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef, System.Threading.Thread) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.Tasks.Task.ExecuteEntryUnsafe(System.Threading.Thread) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.Tasks.Task.ExecuteFromThreadPool(System.Threading.Thread) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.ThreadPoolWorkQueue.Dispatch() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : System.NullReferenceException: Object reference not set to an instance of an object. [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.BasicBlock.ShortenBranches(Int32& delta) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.ComputeOffsetsAndAdjustBranches() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.RealizeBlocks() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.Realize() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.GenerateImpl() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.GenerateMethodBody(PEModuleBuilder moduleBuilder, MethodSymbol method, Int32 methodOrdinal, BoundStatement block, ImmutableArray`1 lambdaDebugInfo, ImmutableArray`1 closureDebugInfo, StateMachineTypeSymbol stateMachineTypeOpt, VariableSlotAllocator variableSlotAllocatorOpt, DiagnosticBag diagnostics, DebugDocumentProvider debugDocumentProvider, ImportChain importChainOpt, Boolean emittingPdb, Boolean emitTestCoverageData, ImmutableArray`1 dynamicAnalysisSpans, AsyncForwardEntryPoint entryPointOpt) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(MethodSymbol methodSymbol, Int32 methodOrdinal, ProcessedFieldInitializers& processedInitializers, SynthesizedSubmissionFields previousSubmissionFields, TypeCompilationState compilationState) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass22_0.<CompileNamedTypeAsync>b__0() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
Build FAILED.
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : Process terminated. System.NullReferenceException: Object reference not set to an instance of an object. [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.BasicBlock.ShortenBranches(Int32& delta) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.ComputeOffsetsAndAdjustBranches() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.RealizeBlocks() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.Realize() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.GenerateImpl() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.GenerateMethodBody(PEModuleBuilder moduleBuilder, MethodSymbol method, Int32 methodOrdinal, BoundStatement block, ImmutableArray`1 lambdaDebugInfo, ImmutableArray`1 closureDebugInfo, StateMachineTypeSymbol stateMachineTypeOpt, VariableSlotAllocator variableSlotAllocatorOpt, DiagnosticBag diagnostics, DebugDocumentProvider debugDocumentProvider, ImportChain importChainOpt, Boolean emittingPdb, Boolean emitTestCoverageData, ImmutableArray`1 dynamicAnalysisSpans, AsyncForwardEntryPoint entryPointOpt) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(MethodSymbol methodSymbol, Int32 methodOrdinal, ProcessedFieldInitializers& processedInitializers, SynthesizedSubmissionFields previousSubmissionFields, TypeCompilationState compilationState) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass22_0.<CompileNamedTypeAsync>b__0() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Environment.FailFast(System.String, System.Exception) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.FailFast.OnFatalException(System.Exception) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.FatalError.Report(System.Exception, System.Action`1<System.Exception>) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.FatalError.ReportUnlessCanceled(System.Exception) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler+<>c__DisplayClass22_0.<CompileNamedTypeAsync>b__0() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder+BasicBlock.ShortenBranches(Int32 ByRef) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.ComputeOffsetsAndAdjustBranches() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.RealizeBlocks() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.Realize() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.GenerateImpl() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.GenerateMethodBody(Microsoft.CodeAnalysis.CSharp.Emit.PEModuleBuilder, Microsoft.CodeAnalysis.CSharp.Symbols.MethodSymbol, Int32, Microsoft.CodeAnalysis.CSharp.BoundStatement, System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.CodeGen.LambdaDebugInfo>, System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.CodeGen.ClosureDebugInfo>, Microsoft.CodeAnalysis.CSharp.StateMachineTypeSymbol, Microsoft.CodeAnalysis.CodeGen.VariableSlotAllocator, Microsoft.CodeAnalysis.DiagnosticBag, Microsoft.CodeAnalysis.CodeGen.DebugDocumentProvider, Microsoft.CodeAnalysis.CSharp.ImportChain, Boolean, Boolean, System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.CodeGen.SourceSpan>, AsyncForwardEntryPoint) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(Microsoft.CodeAnalysis.CSharp.Symbols.MethodSymbol, Int32, ProcessedFieldInitializers ByRef, Microsoft.CodeAnalysis.CSharp.SynthesizedSubmissionFields, Microsoft.CodeAnalysis.CSharp.TypeCompilationState) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(Microsoft.CodeAnalysis.CSharp.Symbols.NamedTypeSymbol) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler+<>c__DisplayClass22_0.<CompileNamedTypeAsync>b__0() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Roslyn.Utilities.UICultureUtilities+<>c__DisplayClass5_0.<WithCurrentUICulture>b__0() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.Tasks.Task.InnerInvoke() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.Tasks.Task+<>c.<.cctor>b__276_0(System.Object) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(System.Threading.Thread, System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef, System.Threading.Thread) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.Tasks.Task.ExecuteEntryUnsafe(System.Threading.Thread) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.Tasks.Task.ExecuteFromThreadPool(System.Threading.Thread) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading.ThreadPoolWorkQueue.Dispatch() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : System.NullReferenceException: Object reference not set to an instance of an object. [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.BasicBlock.ShortenBranches(Int32& delta) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.ComputeOffsetsAndAdjustBranches() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.RealizeBlocks() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CodeGen.ILBuilder.Realize() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.GenerateImpl() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.GenerateMethodBody(PEModuleBuilder moduleBuilder, MethodSymbol method, Int32 methodOrdinal, BoundStatement block, ImmutableArray`1 lambdaDebugInfo, ImmutableArray`1 closureDebugInfo, StateMachineTypeSymbol stateMachineTypeOpt, VariableSlotAllocator variableSlotAllocatorOpt, DiagnosticBag diagnostics, DebugDocumentProvider debugDocumentProvider, ImportChain importChainOpt, Boolean emittingPdb, Boolean emitTestCoverageData, ImmutableArray`1 dynamicAnalysisSpans, AsyncForwardEntryPoint entryPointOpt) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(MethodSymbol methodSymbol, Int32 methodOrdinal, ProcessedFieldInitializers& processedInitializers, SynthesizedSubmissionFields previousSubmissionFields, TypeCompilationState compilationState) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType) [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
C:\Program Files\dotnet\sdk\5.0.100-preview.6.20318.15\Roslyn\Microsoft.CSharp.Core.targets(59,5): error : at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass22_0.<CompileNamedTypeAsync>b__0() [C:\temp\SwitchExpressionBug\SwitchExpressionBug\SwitchExpressionBug.csproj]
0 Warning(s)
43 Error(s)
Time Elapsed 00:00:06.03
This could be compiled with Visual Studio 2019 but cannot with Visual Studio 2019 Preview.
Original Comments
Feedback Bot on 7/21/2020, 08:11 PM:
We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.
Original Solutions
(no solutions)
Issue Analytics
- State:
- Created 3 years ago
- Reactions:2
- Comments:8 (6 by maintainers)
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The fix for this bug will be available in a 16.7 patch release. Thanks again for reporting.
I found that the bug was introduced in #42313 by checking out its parent commit and running the repro test on it. Not certain what the correct fix is yet. /cc @gafter