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dotnet / roslyn

The Roslyn .NET compiler provides C# and Visual Basic languages with rich code analysis APIs.
https://docs.microsoft.com/dotnet/csharp/roslyn-sdk/
MIT License
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.net9 rc1 roslyn crashes on this oneliner: #75577

Closed lucasmeijer closed 1 month ago

lucasmeijer commented 1 month ago 
IEnumerable<A> B() { yield break; } ref struct A;

If i compile this with .net 9.0.100-rc.2.24474.11 on my arm64 mac, roslyn exits with an unhandled exception:

0>Microsoft.CSharp.Core.targets(89,5): Error  : Process terminated. System.InvalidOperationException: Unexpected value 'NoConversion' of type 'Microsoft.CodeAnalysis.CSharp.ConversionKind'
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitConversion(BoundConversion conversion)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitConversionExpression(BoundConversion conversion, Boolean used)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitExpressionCoreWithStackGuard(BoundExpression expression, Boolean used)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitExpression(BoundExpression expression, Boolean used)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitReturnStatement(BoundReturnStatement boundReturnStatement)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitStatement(BoundStatement statement)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitStatements(ImmutableArray`1 statements)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitUninstrumentedBlock(BoundBlock block)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitStatement(BoundStatement statement)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.GenerateImpl()
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler.GenerateMethodBody(PEModuleBuilder moduleBuilder, MethodSymbol method, Int32 methodOrdinal, BoundStatement block, ImmutableArray`1 lambdaDebugInfo, ImmutableArray`1 orderedLambdaRuntimeRudeEdits, ImmutableArray`1 closureDebugInfo, ImmutableArray`1 stateMachineStateDebugInfos, StateMachineTypeSymbol stateMachineTypeOpt, VariableSlotAllocator variableSlotAllocatorOpt, BindingDiagnosticBag diagnostics, DebugDocumentProvider debugDocumentProvider, ImportChain importChainOpt, Boolean emittingPdb, ImmutableArray`1 codeCoverageSpans, AsyncForwardEntryPoint entryPointOpt)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileSynthesizedMethods(TypeCompilationState compilationState)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass25_0.<CompileNamedTypeAsync>b__0()
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at System.Environment.FailFast(System.Runtime.CompilerServices.StackCrawlMarkHandle, System.String, System.Runtime.CompilerServices.ObjectHandleOnStack, System.String)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at System.Environment.FailFast(System.Threading.StackCrawlMark ByRef, System.String, System.Exception, System.String)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at System.Environment.FailFast(System.String, System.Exception)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.FailFast.OnFatalException(System.Exception)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.ErrorReporting.FatalError.Report(System.Exception, Microsoft.CodeAnalysis.ErrorReporting.ErrorSeverity, Boolean)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.ErrorReporting.FatalError.ReportAndPropagateUnlessCanceled(System.Exception, Microsoft.CodeAnalysis.ErrorReporting.ErrorSeverity)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler+<>c__DisplayClass25_0.<CompileNamedTypeAsync>b__0()
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at System.Runtime.EH.FindFirstPassHandler(System.Object, UInt32, System.Runtime.StackFrameIterator ByRef, UInt32 ByRef, Byte* ByRef)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at System.Runtime.EH.DispatchEx(System.Runtime.StackFrameIterator ByRef, ExInfo ByRef)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at System.Runtime.EH.RhThrowEx(System.Object, ExInfo ByRef)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitConversion(Microsoft.CodeAnalysis.CSharp.BoundConversion)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitConversionExpression(Microsoft.CodeAnalysis.CSharp.BoundConversion, Boolean)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitExpressionCoreWithStackGuard(Microsoft.CodeAnalysis.CSharp.BoundExpression, Boolean)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitExpression(Microsoft.CodeAnalysis.CSharp.BoundExpression, Boolean)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitReturnStatement(Microsoft.CodeAnalysis.CSharp.BoundReturnStatement)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitStatement(Microsoft.CodeAnalysis.CSharp.BoundStatement)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitStatements(System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.CSharp.BoundStatement>)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitUninstrumentedBlock(Microsoft.CodeAnalysis.CSharp.BoundBlock)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitStatement(Microsoft.CodeAnalysis.CSharp.BoundStatement)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.GenerateImpl()
0>Microsoft.CSharp.Core.targets(89,5): 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.Emit.EncLambdaInfo>, System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.CodeGen.LambdaRuntimeRudeEditInfo>, System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.Emit.EncClosureInfo>, System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.CodeGen.StateMachineStateDebugInfo>, Microsoft.CodeAnalysis.CSharp.StateMachineTypeSymbol, Microsoft.CodeAnalysis.CodeGen.VariableSlotAllocator, Microsoft.CodeAnalysis.CSharp.BindingDiagnosticBag, Microsoft.CodeAnalysis.CodeGen.DebugDocumentProvider, Microsoft.CodeAnalysis.CSharp.ImportChain, Boolean, System.Collections.Immutable.ImmutableArray`1<Microsoft.CodeAnalysis.CodeGen.SourceSpan>, AsyncForwardEntryPoint)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileSynthesizedMethods(Microsoft.CodeAnalysis.CSharp.TypeCompilationState)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(Microsoft.CodeAnalysis.CSharp.Symbols.NamedTypeSymbol)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler+<>c__DisplayClass25_0.<CompileNamedTypeAsync>b__0()
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(System.Threading.Thread, System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at System.Threading.Tasks.Task.ExecuteWithThreadLocal(System.Threading.Tasks.Task ByRef, System.Threading.Thread)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at System.Threading.ThreadPoolWorkQueue.Dispatch()
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at System.Threading.Thread.StartCallback()
0>Microsoft.CSharp.Core.targets(89,5): Error  : System.InvalidOperationException: Unexpected value 'NoConversion' of type 'Microsoft.CodeAnalysis.CSharp.ConversionKind'
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitConversion(BoundConversion conversion)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitConversionExpression(BoundConversion conversion, Boolean used)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitExpressionCoreWithStackGuard(BoundExpression expression, Boolean used)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitExpression(BoundExpression expression, Boolean used)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitReturnStatement(BoundReturnStatement boundReturnStatement)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitStatement(BoundStatement statement)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitStatements(ImmutableArray`1 statements)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitUninstrumentedBlock(BoundBlock block)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitStatement(BoundStatement statement)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.GenerateImpl()
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler.GenerateMethodBody(PEModuleBuilder moduleBuilder, MethodSymbol method, Int32 methodOrdinal, BoundStatement block, ImmutableArray`1 lambdaDebugInfo, ImmutableArray`1 orderedLambdaRuntimeRudeEdits, ImmutableArray`1 closureDebugInfo, ImmutableArray`1 stateMachineStateDebugInfos, StateMachineTypeSymbol stateMachineTypeOpt, VariableSlotAllocator variableSlotAllocatorOpt, BindingDiagnosticBag diagnostics, DebugDocumentProvider debugDocumentProvider, ImportChain importChainOpt, Boolean emittingPdb, ImmutableArray`1 codeCoverageSpans, AsyncForwardEntryPoint entryPointOpt)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileSynthesizedMethods(TypeCompilationState compilationState)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType)
0>Microsoft.CSharp.Core.targets(89,5): Error  :    at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass25_0.<CompileNamedTypeAsync>b__0()
0>------- Finished building project: ConsoleApp2. Succeeded: False. Errors: 59. Warnings: 0
jaredpar commented 1 month ago

@AlekseyTs suspect this is a dupe of #75569 but will let you confirm.