Assert fails with collection expression of bools

[jjonescz]

Because the NullableWalker is in conditional state when walking through the elements.

[Fact]
public void CollectionExpressionBool()
{
    var source = """
        #nullable enable
        System.Collections.Generic.List<bool> l = [false, true, false];
        """;
    CreateCompilation(source).VerifyDiagnostics();
}

roslyn/src/Compilers/CSharp/Portable/FlowAnalysis/NullableWalker.cs

Lines 344 to 346 in cead4e2

	Debug.Assert(TypeAllowsConditionalState(visitResult.RValueType.Type)
	|| !IsConditionalState
	|| expression is BoundTypeExpression);

[xUnit.net 00:00:01.92]       System.InvalidOperationException : Assertion failed
[xUnit.net 00:00:01.93]       Stack Trace:
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\Test\Core\ThrowingTraceListener.cs(26,0): at Microsoft.CodeAnalysis.ThrowingTraceListener.Fail(String message, String detailMessage)
[xUnit.net 00:00:01.93]            at System.Diagnostics.TraceInternal.Fail(String message, String detailMessage)
[xUnit.net 00:00:01.93]            at System.Diagnostics.Debug.Fail(String message, String detailMessage)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(344,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.SetResult(BoundExpression expression, VisitResult visitResult, Boolean updateAnalyzedNullability, Nullable`1 isLvalue)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(337,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.SetResult(BoundExpression expression, TypeWithState resultType, TypeWithAnnotations lvalueType, Boolean updateAnalyzedNullability, Nullable`1 isLvalue)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(298,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.SetResultType(BoundExpression expression, TypeWithState type, Boolean updateAnalyzedNullability)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(11605,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.SetUnknownResultNullability(BoundExpression expression)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3661,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitCollectionExpression(BoundCollectionExpression node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Generated\BoundNodes.xml.Generated.cs(6462,0): at Microsoft.CodeAnalysis.CSharp.BoundCollectionExpression.Accept(BoundTreeVisitor visitor)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\BoundTree\BoundTreeVisitors.cs(151,0): at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(375,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitExpressionOrPatternWithoutStackGuard(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3488,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitExpressionOrPatternWithoutStackGuard(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\BoundTree\BoundTreeVisitors.cs(243,0): at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\BoundTree\BoundTreeVisitors.cs(217,0): at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.VisitExpressionOrPatternWithStackGuard(Int32& recursionDepth, BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(366,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitWithStackGuard(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(354,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitAlways(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(343,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3608,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.Visit(BoundNode node, Boolean expressionIsRead)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3577,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(2188,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitRvalue(BoundExpression node, Boolean isKnownToBeAnLvalue)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(2208,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitRvalueWithState(BoundExpression node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(8207,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, Boolean useLegacyWarnings, Boolean trackMembers, AssignmentKind assignmentKind, Boolean delayCompletionForTargetType)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(8192,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitOptionalImplicitConversion(BoundExpression expr, TypeWithAnnotations targetTypeOpt, Boolean useLegacyWarnings, Boolean trackMembers, AssignmentKind assignmentKind)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3458,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitLocalDeclaration(BoundLocalDeclaration node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Generated\BoundNodes.xml.Generated.cs(3420,0): at Microsoft.CodeAnalysis.CSharp.BoundLocalDeclaration.Accept(BoundTreeVisitor visitor)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\BoundTree\BoundTreeVisitors.cs(151,0): at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(369,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitWithStackGuard(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(354,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitAlways(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(343,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3608,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.Visit(BoundNode node, Boolean expressionIsRead)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3577,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(672,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitStatement(BoundStatement statement)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3617,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitStatement(BoundStatement statement)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3135,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitStatementsWithLocalFunctions(BoundBlock block)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3038,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.VisitBlock(BoundBlock node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Generated\BoundNodes.xml.Generated.cs(3324,0): at Microsoft.CodeAnalysis.CSharp.BoundBlock.Accept(BoundTreeVisitor visitor)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\BoundTree\BoundTreeVisitors.cs(151,0): at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(369,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitWithStackGuard(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(354,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitAlways(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(343,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3608,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.Visit(BoundNode node, Boolean expressionIsRead)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3577,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(3806,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitMethodBodies(BoundBlock blockBody, BoundBlock expressionBody)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(3699,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitNonConstructorMethodBody(BoundNonConstructorMethodBody node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Generated\BoundNodes.xml.Generated.cs(8714,0): at Microsoft.CodeAnalysis.CSharp.BoundNonConstructorMethodBody.Accept(BoundTreeVisitor visitor)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\BoundTree\BoundTreeVisitors.cs(151,0): at Microsoft.CodeAnalysis.CSharp.BoundTreeVisitor.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(369,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitWithStackGuard(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(354,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.VisitAlways(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(343,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3608,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.Visit(BoundNode node, Boolean expressionIsRead)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(3577,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.Visit(BoundNode node)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(424,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.Scan(Boolean& badRegion)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(600,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.Scan(Boolean& badRegion)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\AbstractFlowPass.cs(447,0): at Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2.Analyze(Boolean& badRegion, Optional`1 initialState)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(1779,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.Analyze(NullableWalker walker, Symbol symbol, DiagnosticBag diagnostics, Optional`1 initialState, Builder snapshotBuilderOpt, Boolean requiresAnalysis)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(1747,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.Analyze(CSharpCompilation compilation, Symbol symbol, BoundNode node, Binder binder, Conversions conversions, DiagnosticBag diagnostics, Boolean useConstructorExitWarnings, Boolean useDelegateInvokeParameterTypes, Boolean useDelegateInvokeReturnType, MethodSymbol delegateInvokeMethodOpt, VariableState initialState, MethodSymbol baseOrThisInitializer, Builder analyzedNullabilityMapOpt, Builder snapshotBuilderOpt, ArrayBuilder`1 returnTypesOpt, Boolean getFinalNullableState, VariableState& finalNullableState, Boolean requiresAnalysis)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(1509,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.AnalyzeWithSemanticInfo(CSharpCompilation compilation, Symbol symbol, BoundNode node, Binder binder, VariableState initialState, DiagnosticBag diagnostics, Boolean createSnapshots, Boolean requiresAnalysis)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs(1489,0): at Microsoft.CodeAnalysis.CSharp.NullableWalker.AnalyzeAndRewrite(CSharpCompilation compilation, Symbol symbol, BoundNode node, Binder binder, VariableState initialState, DiagnosticBag diagnostics, Boolean createSnapshots, SnapshotManager& snapshotManager, ImmutableDictionary`2& remappedSymbols)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Compiler\MethodCompiler.cs(1811,0): 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)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Compiler\MethodCompiler.cs(1008,0): at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(MethodSymbol methodSymbol, Int32 methodOrdinal, ProcessedFieldInitializers& processedInitializers, SynthesizedSubmissionFields previousSubmissionFields, TypeCompilationState compilationState)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Compiler\MethodCompiler.cs(537,0): at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Compiler\MethodCompiler.cs(439,0): at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass25_0.<CompileNamedTypeAsync>b__0()
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\Core\Portable\InternalUtilities\UICultureUtilities.cs(139,0): at Roslyn.Utilities.UICultureUtilities.<>c__DisplayClass5_0.<WithCurrentUICulture>b__0()
[xUnit.net 00:00:01.93]            at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
[xUnit.net 00:00:01.93]         --- End of stack trace from previous location ---
[xUnit.net 00:00:01.93]            at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
[xUnit.net 00:00:01.93]            at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
[xUnit.net 00:00:01.93]         --- End of stack trace from previous location ---
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Compiler\MethodCompiler.cs(338,0): at Microsoft.CodeAnalysis.CSharp.MethodCompiler.WaitForWorkers()
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Compiler\MethodCompiler.cs(160,0): at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethodBodies(CSharpCompilation compilation, PEModuleBuilder moduleBeingBuiltOpt, Boolean emittingPdb, Boolean hasDeclarationErrors, Boolean emitMethodBodies, BindingDiagnosticBag diagnostics, Predicate`1 filterOpt, CancellationToken cancellationToken)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Compilation\CSharpCompilation.cs(3023,0): at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnosticsForAllMethodBodies(BindingDiagnosticBag diagnostics, Boolean doLowering, CancellationToken cancellationToken)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Compilation\CSharpCompilation.cs(2995,0): at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnosticsWithoutSeverityFiltering(CompilationStage stage, Boolean includeEarlierStages, BindingDiagnosticBag builder, Predicate`1 symbolFilter, CancellationToken cancellationToken)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Compilation\CSharpCompilation.cs(2906,0): at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnostics(CompilationStage stage, Boolean includeEarlierStages, DiagnosticBag diagnostics, Predicate`1 symbolFilter, CancellationToken cancellationToken)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Compilation\CSharpCompilation.cs(2894,0): at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnostics(CompilationStage stage, Boolean includeEarlierStages, Predicate`1 symbolFilter, CancellationToken cancellationToken)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Portable\Compilation\CSharpCompilation.cs(2888,0): at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnostics(CancellationToken cancellationToken)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\Test\Core\Diagnostics\DiagnosticExtensions.cs(108,0): at Microsoft.CodeAnalysis.DiagnosticExtensions.VerifyDiagnostics[TCompilation](TCompilation c, DiagnosticDescription[] expected)
[xUnit.net 00:00:01.93]         D:\roslyn-A\src\Compilers\CSharp\Test\Semantic\Semantics\NullableReferenceTypesTests.cs(117,0): at Microsoft.CodeAnalysis.CSharp.UnitTests.Semantics.NullableReferenceTypesTests.CollectionExpressionBool()
[xUnit.net 00:00:01.93]            at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
[xUnit.net 00:00:01.93]            at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)