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Assert in WasPropertyBackingFieldAccessChecked #80008

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#80010
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Assert in WasPropertyBackingFieldAccessChecked#80008
Bug
#80010
Assignees
333fred
Labels
Area-Compilers
Milestone
18.0 P2
@333fred

Description

@333fred
333fred
opened on Aug 21, 2025

Using a property in the from clause of a linq expression causes an assert in CheckValue, as we end up calling CheckValue on the receiver twice.

Example snippets:

using System.Linq;

var f = new F();
var r = from string s in f.M from string s2 in f.M2 select s.ToString();
foreach (var x in r)
{
    System.Console.Write(x.ToString());
}

public class F
{
    public object[] M => ["ran"];
    public object[] M2 => [""];
}
using System.Linq;

var r = from string s in F.M from string s2 in F.M2 select s.ToString();
foreach (var x in r)
{
    System.Console.Write(x.ToString());
}

public static class F
{
    public static object[] M => ["ran"];
    public static object[] M2 => [""];
}
using System.Linq;

var r = from string s in object.M from string s2 in object.M2 select s.ToString();
foreach (var x in r)
{
    System.Console.Write(x.ToString());
}

static class E
{
    extension(object o)
    {
        public static object[] M => ["ran"];
        public static object[] M2 => [""];
    }
}
System.InvalidOperationException : should not be set twice or reset.
   at Microsoft.CodeAnalysis.ThrowingTraceListener.Fail(String message, String detailMessage) in /home/fred/git/r2/src/Compilers/Test/Core/ThrowingTraceListener.cs:line 26
   at System.Diagnostics.TraceInternal.Fail(String message, String detailMessage)
   at System.Diagnostics.Debug.Fail(String message, String detailMessage)
   at Microsoft.CodeAnalysis.CSharp.BoundNode.set_WasPropertyBackingFieldAccessChecked(Boolean value) in /home/fred/git/r2/src/Compilers/CSharp/Portable/BoundTree/BoundNode.cs:line 344
   at Microsoft.CodeAnalysis.CSharp.Binder.CheckValue(BoundExpression expr, BindValueKind valueKind, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder.ValueChecks.cs:line 777
   at Microsoft.CodeAnalysis.CSharp.Binder.MakeQueryInvocation(CSharpSyntaxNode node, BoundExpression receiver, String methodName, SeparatedSyntaxList`1 typeArgsSyntax, ImmutableArray`1 typeArgs, ImmutableArray`1 args, BindingDiagnosticBag diagnostics, String expectedMethodName) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Query.cs:line 985
   at Microsoft.CodeAnalysis.CSharp.Binder.MakeQueryInvocation(CSharpSyntaxNode node, BoundExpression receiver, String methodName, TypeSyntax typeArgSyntax, TypeWithAnnotations typeArg, BindingDiagnosticBag diagnostics, String expectedMethodName) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Query.cs:line 906
   at Microsoft.CodeAnalysis.CSharp.Binder.<>c__DisplayClass903_0.<MakeQueryUnboundLambdaWithCast>b__0(LambdaSymbol lambdaSymbol, Binder lambdaBodyBinder, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Query.cs:line 850
   at Microsoft.CodeAnalysis.CSharp.Binder.QueryUnboundLambdaState.BindLambdaBodyCore(LambdaSymbol lambdaSymbol, Binder lambdaBodyBinder, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder.QueryUnboundLambdaState.cs:line 85
   at Microsoft.CodeAnalysis.CSharp.UnboundLambdaState.BindLambdaBody(LambdaSymbol lambdaSymbol, Binder lambdaBodyBinder, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/BoundTree/UnboundLambda.cs:line 596
   at Microsoft.CodeAnalysis.CSharp.UnboundLambdaState.BindWithParameterAndReturnType(ImmutableArray`1 parameterTypes, ImmutableArray`1 parameterRefKinds, TypeWithAnnotations returnType, RefKind refKind) in /home/fred/git/r2/src/Compilers/CSharp/Portable/BoundTree/UnboundLambda.cs:line 1022
   at Microsoft.CodeAnalysis.CSharp.UnboundLambdaState.ReallyInferReturnType(NamedTypeSymbol delegateType, ImmutableArray`1 parameterTypes, ImmutableArray`1 parameterRefKinds) in /home/fred/git/r2/src/Compilers/CSharp/Portable/BoundTree/UnboundLambda.cs:line 957
   at Microsoft.CodeAnalysis.CSharp.UnboundLambdaState.BindForReturnTypeInference(NamedTypeSymbol delegateType) in /home/fred/git/r2/src/Compilers/CSharp/Portable/BoundTree/UnboundLambda.cs:line 1034
   at Microsoft.CodeAnalysis.CSharp.UnboundLambda.BindForReturnTypeInference(NamedTypeSymbol delegateType) in /home/fred/git/r2/src/Compilers/CSharp/Portable/BoundTree/UnboundLambda.cs:line 456
   at Microsoft.CodeAnalysis.CSharp.UnboundLambda.InferReturnType(ConversionsBase conversions, NamedTypeSymbol delegateType, CompoundUseSiteInfo`1& useSiteInfo, Boolean& inferredFromFunctionType) in /home/fred/git/r2/src/Compilers/CSharp/Portable/BoundTree/UnboundLambda.cs:line 485
   at Microsoft.CodeAnalysis.CSharp.MethodTypeInferrer.InferReturnType(BoundExpression source, NamedTypeSymbol target, CompoundUseSiteInfo`1& useSiteInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/MethodTypeInference.cs:line 3142
   at Microsoft.CodeAnalysis.CSharp.MethodTypeInferrer.InferredReturnTypeInference(BoundExpression source, TypeWithAnnotations target, CompoundUseSiteInfo`1& useSiteInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/MethodTypeInference.cs:line 1424
   at Microsoft.CodeAnalysis.CSharp.MethodTypeInferrer.OutputTypeInference(Binder binder, BoundExpression expression, TypeWithAnnotations target, CompoundUseSiteInfo`1& useSiteInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/MethodTypeInference.cs:line 1377
   at Microsoft.CodeAnalysis.CSharp.MethodTypeInferrer.MakeOutputTypeInferences(Binder binder, BoundExpression argument, TypeWithAnnotations formalType, CompoundUseSiteInfo`1& useSiteInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/MethodTypeInference.cs:line 893
   at Microsoft.CodeAnalysis.CSharp.MethodTypeInferrer.MakeOutputTypeInferences(Binder binder, CompoundUseSiteInfo`1& useSiteInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/MethodTypeInference.cs:line 871
   at Microsoft.CodeAnalysis.CSharp.MethodTypeInferrer.DoSecondPhase(Binder binder, CompoundUseSiteInfo`1& useSiteInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/MethodTypeInference.cs:line 828
   at Microsoft.CodeAnalysis.CSharp.MethodTypeInferrer.InferTypeArgsSecondPhase(Binder binder, CompoundUseSiteInfo`1& useSiteInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/MethodTypeInference.cs:line 799
   at Microsoft.CodeAnalysis.CSharp.MethodTypeInferrer.InferTypeArgs(Binder binder, CompoundUseSiteInfo`1& useSiteInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/MethodTypeInference.cs:line 589
   at Microsoft.CodeAnalysis.CSharp.MethodTypeInferrer.Infer(Binder binder, ConversionsBase conversions, ImmutableArray`1 methodTypeParameters, NamedTypeSymbol constructedContainingTypeOfMethod, ImmutableArray`1 formalParameterTypes, ImmutableArray`1 formalParameterRefKinds, ImmutableArray`1 arguments, CompoundUseSiteInfo`1& useSiteInfo, Extensions extensions, Dictionary`2 ordinals) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/MethodTypeInference.cs:line 309
   at Microsoft.CodeAnalysis.CSharp.OverloadResolution.InferMethodTypeArguments[TMember](TMember member, ImmutableArray`1 originalTypeParameters, AnalyzedArguments arguments, EffectiveParameters originalEffectiveParameters, Boolean& hasTypeArgumentsInferredFromFunctionType, MemberAnalysisResult& error, CompoundUseSiteInfo`1& useSiteInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/OverloadResolution.cs:line 4412
   at Microsoft.CodeAnalysis.CSharp.OverloadResolution.IsApplicable[TMember](TMember member, TMember leastOverriddenMember, ArrayBuilder`1 typeArgumentsBuilder, AnalyzedArguments arguments, Options options, EffectiveParameters constructedFromEffectiveParameters, TypeWithAnnotations definitionParamsElementTypeOpt, Boolean isExpanded, ImmutableArray`1 argsToParamsMap, Boolean hasAnyRefOmittedArgument, Boolean inferWithDynamic, Boolean completeResults, Boolean dynamicConvertsToAnything, Boolean isMethodGroupConversion, CompoundUseSiteInfo`1& useSiteInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/OverloadResolution.cs:line 4284
   at Microsoft.CodeAnalysis.CSharp.OverloadResolution.IsMemberApplicableInNormalForm[TMember](TMember member, TMember leastOverriddenMember, ArrayBuilder`1 typeArguments, AnalyzedArguments arguments, Options options, Boolean completeResults, CompoundUseSiteInfo`1& useSiteInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/OverloadResolution.cs:line 4096
   at Microsoft.CodeAnalysis.CSharp.OverloadResolution.AddMemberToCandidateSet[TMember](TMember member, ArrayBuilder`1 results, ArrayBuilder`1 members, ArrayBuilder`1 typeArguments, AnalyzedArguments arguments, Boolean completeResults, Dictionary`2 containingTypeMapOpt, CompoundUseSiteInfo`1& useSiteInfo, Options options, Boolean checkOverriddenOrHidden) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/OverloadResolution.cs:line 1176
   at Microsoft.CodeAnalysis.CSharp.OverloadResolution.PerformMemberOverloadResolutionStart[TMember](ArrayBuilder`1 results, ArrayBuilder`1 members, ArrayBuilder`1 typeArguments, AnalyzedArguments arguments, Boolean completeResults, CompoundUseSiteInfo`1& useSiteInfo, Options options, Boolean checkOverriddenOrHidden) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/OverloadResolution.cs:line 379
   at Microsoft.CodeAnalysis.CSharp.OverloadResolution.PerformMemberOverloadResolution[TMember](ArrayBuilder`1 results, ArrayBuilder`1 members, ArrayBuilder`1 typeArguments, BoundExpression receiver, AnalyzedArguments arguments, Boolean completeResults, RefKind returnRefKind, TypeSymbol returnType, CallingConventionInfo& callingConventionInfo, CompoundUseSiteInfo`1& useSiteInfo, Options options, Boolean checkOverriddenOrHidden) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/OverloadResolution.cs:line 446
   at Microsoft.CodeAnalysis.CSharp.OverloadResolution.MethodOrPropertyOverloadResolution[TMember](ArrayBuilder`1 members, ArrayBuilder`1 typeArguments, BoundExpression receiver, AnalyzedArguments arguments, OverloadResolutionResult`1 result, CompoundUseSiteInfo`1& useSiteInfo, Options options, RefKind returnRefKind, TypeSymbol returnType, CallingConventionInfo& callingConventionInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/OverloadResolution.cs:line 207
   at Microsoft.CodeAnalysis.CSharp.OverloadResolution.MethodInvocationOverloadResolution(ArrayBuilder`1 methods, ArrayBuilder`1 typeArguments, BoundExpression receiver, AnalyzedArguments arguments, OverloadResolutionResult`1 result, CompoundUseSiteInfo`1& useSiteInfo, Options options, RefKind returnRefKind, TypeSymbol returnType, CallingConventionInfo& callingConventionInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Semantics/OverloadResolution/OverloadResolution.cs:line 155
   at Microsoft.CodeAnalysis.CSharp.Binder.<ResolveExtension>g__resolveMethods|524_1(SyntaxNode expression, BoundExpression left, ImmutableArray`1 typeArgumentsWithAnnotations, TypeSymbol returnType, RefKind returnRefKind, LookupResult lookupResult, AnalyzedArguments analyzedArguments, AnalyzedArguments& actualMethodArguments, Options options, CallingConventionInfo& callingConvention, Binder binder, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 8777
   at Microsoft.CodeAnalysis.CSharp.Binder.<ResolveExtension>g__tryResolveExtensionInScope|524_0(SyntaxNode expression, BoundExpression left, String memberName, Int32 arity, ImmutableArray`1 typeArgumentsWithAnnotations, TypeSymbol returnType, RefKind returnRefKind, LookupResult lookupResult, AnalyzedArguments analyzedArguments, AnalyzedArguments& actualMethodArguments, AnalyzedArguments& actualReceiverArguments, CompoundUseSiteInfo`1& useSiteInfo, MethodGroupResolution& firstResult, Options options, CallingConventionInfo callingConvention, LookupResult classicExtensionLookupResult, LookupOptions lookupOptions, Binder binder, ExtensionScope scope, Boolean acceptOnlyMethods, BindingDiagnosticBag diagnostics, MethodGroupResolution& result) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 8643
   at Microsoft.CodeAnalysis.CSharp.Binder.ResolveExtension(SyntaxNode expression, String memberName, AnalyzedArguments analyzedArguments, BoundExpression left, ImmutableArray`1 typeArgumentsWithAnnotations, Options options, RefKind returnRefKind, TypeSymbol returnType, CompoundUseSiteInfo`1& useSiteInfo, Boolean acceptOnlyMethods, CallingConventionInfo& callingConvention) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 8568
   at Microsoft.CodeAnalysis.CSharp.Binder.ResolveMethodGroupInternal(BoundMethodGroup methodGroup, SyntaxNode expression, String memberName, AnalyzedArguments analyzedArguments, CompoundUseSiteInfo`1& useSiteInfo, Options options, Boolean acceptOnlyMethods, RefKind returnRefKind, TypeSymbol returnType, CallingConventionInfo& callingConvention) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 10659
   at Microsoft.CodeAnalysis.CSharp.Binder.ResolveMethodGroup(BoundMethodGroup node, SyntaxNode expression, String memberName, AnalyzedArguments analyzedArguments, CompoundUseSiteInfo`1& useSiteInfo, Options options, Boolean acceptOnlyMethods, RefKind returnRefKind, TypeSymbol returnType, CallingConventionInfo& callingConventionInfo) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 10615
   at Microsoft.CodeAnalysis.CSharp.Binder.BindMethodGroupInvocation(SyntaxNode syntax, SyntaxNode expression, String methodName, BoundMethodGroup methodGroup, AnalyzedArguments analyzedArguments, BindingDiagnosticBag diagnostics, CSharpSyntaxNode queryClause, Boolean ignoreNormalFormIfHasValidParamsParameter, Boolean& anyApplicableCandidates, Boolean disallowExpandedNonArrayParams, Boolean acceptOnlyMethods) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Invocation.cs:line 720
   at Microsoft.CodeAnalysis.CSharp.Binder.BindInvocationExpression(SyntaxNode node, SyntaxNode expression, String methodName, BoundExpression boundExpression, AnalyzedArguments analyzedArguments, BindingDiagnosticBag diagnostics, Boolean acceptOnlyMethods, CSharpSyntaxNode queryClause, Boolean ignoreNormalFormIfHasValidParamsParameter, Boolean disallowExpandedNonArrayParams) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Invocation.cs:line 360
   at Microsoft.CodeAnalysis.CSharp.Binder.MakeInvocationExpression(SyntaxNode node, BoundExpression receiver, String methodName, ImmutableArray`1 args, BindingDiagnosticBag diagnostics, SeparatedSyntaxList`1 typeArgsSyntax, ImmutableArray`1 typeArgs, ImmutableArray`1 names, CSharpSyntaxNode queryClause, Boolean allowFieldsAndProperties, Boolean ignoreNormalFormIfHasValidParamsParameter, Boolean searchExtensionsIfNecessary, Boolean disallowExpandedNonArrayParams) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Invocation.cs:line 139
   at Microsoft.CodeAnalysis.CSharp.Binder.MakeQueryInvocation(CSharpSyntaxNode node, BoundExpression receiver, String methodName, SeparatedSyntaxList`1 typeArgsSyntax, ImmutableArray`1 typeArgs, ImmutableArray`1 args, BindingDiagnosticBag diagnostics, String expectedMethodName) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Query.cs:line 992
   at Microsoft.CodeAnalysis.CSharp.Binder.MakeQueryInvocation(CSharpSyntaxNode node, BoundExpression receiver, String methodName, ImmutableArray`1 args, BindingDiagnosticBag diagnostics, String expectedMethodName) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Query.cs:line 893
   at Microsoft.CodeAnalysis.CSharp.Binder.ReduceFrom(FromClauseSyntax from, QueryTranslationState state, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Query.cs:line 611
   at Microsoft.CodeAnalysis.CSharp.Binder.ReduceQuery(QueryTranslationState state, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Query.cs:line 348
   at Microsoft.CodeAnalysis.CSharp.Binder.BindQueryInternal2(QueryTranslationState state, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Query.cs:line 213
   at Microsoft.CodeAnalysis.CSharp.Binder.BindQueryInternal1(QueryTranslationState state, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Query.cs:line 170
   at Microsoft.CodeAnalysis.CSharp.Binder.BindQuery(QueryExpressionSyntax node, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Query.cs:line 69
   at Microsoft.CodeAnalysis.CSharp.Binder.<BindExpressionInternal>g__bindExpressionInternal|349_0(ExpressionSyntax node, BindingDiagnosticBag diagnostics, Boolean invoked, Boolean indexed) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 763
   at Microsoft.CodeAnalysis.CSharp.Binder.BindExpressionInternal(ExpressionSyntax node, BindingDiagnosticBag diagnostics, Boolean invoked, Boolean indexed) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 586
   at Microsoft.CodeAnalysis.CSharp.Binder.BindExpression(ExpressionSyntax node, BindingDiagnosticBag diagnostics, Boolean invoked, Boolean indexed) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 543
   at Microsoft.CodeAnalysis.CSharp.Binder.BindValue(ExpressionSyntax node, BindingDiagnosticBag diagnostics, BindValueKind valueKind) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 243
   at Microsoft.CodeAnalysis.CSharp.Binder.BindInferredVariableInitializer(BindingDiagnosticBag diagnostics, ExpressionSyntax initializer, BindValueKind valueKind, CSharpSyntaxNode errorSyntax) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 893
   at Microsoft.CodeAnalysis.CSharp.Binder.BindVariableDeclaration(SourceLocalSymbol localSymbol, LocalDeclarationKind kind, Boolean isVar, VariableDeclaratorSyntax declarator, TypeSyntax typeSyntax, TypeWithAnnotations declTypeOpt, AliasSymbol aliasOpt, BindingDiagnosticBag diagnostics, Boolean includeBoundType, CSharpSyntaxNode associatedSyntaxNode) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 1019
   at Microsoft.CodeAnalysis.CSharp.Binder.BindVariableDeclaration(LocalDeclarationKind kind, Boolean isVar, VariableDeclaratorSyntax declarator, TypeSyntax typeSyntax, TypeWithAnnotations declTypeOpt, AliasSymbol aliasOpt, BindingDiagnosticBag diagnostics, Boolean includeBoundType, CSharpSyntaxNode associatedSyntaxNode) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 962
   at Microsoft.CodeAnalysis.CSharp.Binder.BindDeclarationStatementParts(LocalDeclarationStatementSyntax node, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 734
   at Microsoft.CodeAnalysis.CSharp.Binder.BindLocalDeclarationStatement(LocalDeclarationStatementSyntax node, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 696
   at Microsoft.CodeAnalysis.CSharp.Binder.BindStatement(StatementSyntax node, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 67
   at Microsoft.CodeAnalysis.CSharp.Binder.BindSimpleProgramCompilationUnit(CompilationUnitSyntax compilationUnit, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 3706
   at Microsoft.CodeAnalysis.CSharp.Binder.BindSimpleProgram(CompilationUnitSyntax compilationUnit, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 3689
   at Microsoft.CodeAnalysis.CSharp.Binder.BindMethodBody(CSharpSyntaxNode syntax, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 3680
   at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c.<BindMethodBody>b__44_4(Binder bodyBinder, CSharpSyntaxNode syntaxNode, Object _, BindingDiagnosticBag diagnostics) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Compiler/MethodCompiler.cs:line 1925
   at Microsoft.CodeAnalysis.CSharp.Binder.BindWithLambdaBindingCountDiagnostics[TSyntax,TArg,TResult](TSyntax syntax, TArg arg, BindingDiagnosticBag diagnostics, Func`5 bind) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Binder/Binder_Lambda.cs:line 435
   at Microsoft.CodeAnalysis.CSharp.MethodCompiler.BindMethodBody(MethodSymbol method, TypeCompilationState compilationState, BindingDiagnosticBag diagnostics, Boolean includeInitializersInBody, BoundNode initializersBody, Boolean reportNullableDiagnostics, ImportChain& importChain, Boolean& originalBodyNested, Boolean& prependedDefaultValueTypeConstructorInitializer, InitialState& forSemanticModel) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Compiler/MethodCompiler.cs:line 1921
   at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(MethodSymbol methodSymbol, Int32 methodOrdinal, ProcessedFieldInitializers& processedInitializers, SynthesizedSubmissionFields previousSubmissionFields, TypeCompilationState compilationState) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Compiler/MethodCompiler.cs:line 1053
   at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType) in /home/fred/git/r2/src/Compilers/CSharp/Portable/Compiler/MethodCompiler.cs:line 561
   at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass25_0.<CompileNamedTypeAsync>b__0() in /home/fred/git/r2/src/Compilers/CSharp/Portable/Compiler/MethodCompiler.cs:line 446
   at Roslyn.Utilities.UICultureUtilities.<>c__DisplayClass5_0.<WithCurrentUICulture>b__0() in /home/fred/git/r2/src/Compilers/Core/Portable/InternalUtilities/UICultureUtilities.cs:line 139
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)

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