usingSystem.Runtime.CompilerServices;M("",$"test");voidM(strings,[InterpolatedStringHandlerArgument(nameof(s))]paramsCustomHandler[]handlers){}[InterpolatedStringHandler]publicclassCustomHandler{publicCustomHandler(inta,intb,stringtest){}publicvoidAppendLiteral(strings){}}

System.InvalidCastException: Unable to cast object of type 'SZArray' to type 'Microsoft.CodeAnalysis.CSharp.Symbols.NamedTypeSymbol'.   at Microsoft.CodeAnalysis.CSharp.Binder.<CreateConversion>g__createConversion|208_0(SyntaxNode syntax, BoundExpression source, Conversion conversion, Boolean isCast, ConversionGroup conversionGroupOpt, Boolean wasCompilerGenerated, TypeSymbol destination, BindingDiagnosticBag diagnostics, Boolean hasErrors) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Conversions.cs:line 201   at Microsoft.CodeAnalysis.CSharp.Binder.BindInterpolatedStringHandlerInMemberCall(BoundExpression unconvertedString, ArrayBuilder`1 arguments, ImmutableArray`1 parameters, MemberAnalysisResult& memberAnalysisResult, Int32 interpolatedStringArgNum, BoundExpression receiver, BindingDiagnosticBag diagnostics) in /_/src/Compilers/CSharp/Portable/Binder/Binder_InterpolatedString.cs:line 905   at Microsoft.CodeAnalysis.CSharp.Binder.CheckAndCoerceArguments[TMember](MemberResolutionResult`1 methodResult, AnalyzedArguments analyzedArguments, BindingDiagnosticBag diagnostics, BoundExpression receiver, Boolean invokedAsExtensionMethod) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 3411   at Microsoft.CodeAnalysis.CSharp.Binder.BindInvocationExpressionContinued(SyntaxNode node, SyntaxNode expression, String methodName, OverloadResolutionResult`1 result, AnalyzedArguments analyzedArguments, MethodGroup methodGroup, NamedTypeSymbol delegateTypeOpt, BindingDiagnosticBag diagnostics, CSharpSyntaxNode queryClause) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Invocation.cs:line 1075   at Microsoft.CodeAnalysis.CSharp.Binder.BindMethodGroupInvocation(SyntaxNode syntax, SyntaxNode expression, String methodName, BoundMethodGroup methodGroup, AnalyzedArguments analyzedArguments, BindingDiagnosticBag diagnostics, CSharpSyntaxNode queryClause, Boolean allowUnexpandedForm, Boolean& anyApplicableCandidates) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Invocation.cs:line 741   at Microsoft.CodeAnalysis.CSharp.Binder.BindInvocationExpression(SyntaxNode node, SyntaxNode expression, String methodName, BoundExpression boundExpression, AnalyzedArguments analyzedArguments, BindingDiagnosticBag diagnostics, CSharpSyntaxNode queryClause, Boolean allowUnexpandedForm) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Invocation.cs:line 321   at Microsoft.CodeAnalysis.CSharp.Binder.<BindInvocationExpression>g__bindArgumentsAndInvocation|573_0(InvocationExpressionSyntax node, BoundExpression boundExpression, AnalyzedArguments analyzedArguments, BindingDiagnosticBag diagnostics) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Invocation.cs:line 225   at Microsoft.CodeAnalysis.CSharp.Binder.BindInvocationExpression(InvocationExpressionSyntax node, BindingDiagnosticBag diagnostics) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Invocation.cs:line 214   at Microsoft.CodeAnalysis.CSharp.Binder.<BindExpressionInternal>g__bindExpressionInternal|325_0(ExpressionSyntax node, BindingDiagnosticBag diagnostics, Boolean invoked, Boolean indexed) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 602   at Microsoft.CodeAnalysis.CSharp.Binder.BindExpressionInternal(ExpressionSyntax node, BindingDiagnosticBag diagnostics, Boolean invoked, Boolean indexed) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs:line 579   at Microsoft.CodeAnalysis.CSharp.Binder.BindExpressionStatement(CSharpSyntaxNode node, ExpressionSyntax syntax, Boolean allowsAnyExpression, BindingDiagnosticBag diagnostics) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 648   at Microsoft.CodeAnalysis.CSharp.Binder.BindExpressionStatement(ExpressionStatementSyntax node, BindingDiagnosticBag diagnostics) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 641   at Microsoft.CodeAnalysis.CSharp.Binder.BindStatement(StatementSyntax node, BindingDiagnosticBag diagnostics) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 72   at Microsoft.CodeAnalysis.CSharp.Binder.BindSimpleProgramCompilationUnit(CompilationUnitSyntax compilationUnit, BindingDiagnosticBag diagnostics) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 3581   at Microsoft.CodeAnalysis.CSharp.Binder.BindMethodBody(CSharpSyntaxNode syntax, BindingDiagnosticBag diagnostics) in /_/src/Compilers/CSharp/Portable/Binder/Binder_Statements.cs:line 3555   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 /_/src/Compilers/CSharp/Portable/Compiler/MethodCompiler.cs:line 1773   at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileMethod(MethodSymbol methodSymbol, Int32 methodOrdinal, ProcessedFieldInitializers& processedInitializers, SynthesizedSubmissionFields previousSubmissionFields, TypeCompilationState compilationState) in /_/src/Compilers/CSharp/Portable/Compiler/MethodCompiler.cs:line 991   at Microsoft.CodeAnalysis.CSharp.MethodCompiler.CompileNamedType(NamedTypeSymbol containingType) in /_/src/Compilers/CSharp/Portable/Compiler/MethodCompiler.cs:line 530   at Microsoft.CodeAnalysis.CSharp.MethodCompiler.<>c__DisplayClass25_0.<CompileNamedTypeAsync>b__0() in /_/src/Compilers/CSharp/Portable/Compiler/MethodCompiler.cs:line 432   at Roslyn.Utilities.UICultureUtilities.<>c__DisplayClass5_0.<WithCurrentUICulture>b__0() in /_/src/Compilers/Core/Portable/InternalUtilities/UICultureUtilities.cs:line 139   at System.Threading.Tasks.Task.InnerInvoke()   at System.Threading.Tasks.Task.<>c.<.cctor>b__281_0(Object obj)   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)