private BoundLambda ReallyInferReturnType(NamedTypeSymbol delegateType, ImmutableArray <TypeSymbol> parameterTypes, ImmutableArray <RefKind> parameterRefKinds)
{
var diagnostics = DiagnosticBag.GetInstance();
var lambdaSymbol = new LambdaSymbol(
binder.Compilation,
binder.ContainingMemberOrLambda,
_unboundLambda,
parameterTypes,
parameterRefKinds,
refKind: CodeAnalysis.RefKind.None,
returnType: null,
diagnostics: diagnostics);
Binder lambdaBodyBinder = new ExecutableCodeBinder(_unboundLambda.Syntax, lambdaSymbol, ParameterBinder(lambdaSymbol, binder));
var block = BindLambdaBody(lambdaSymbol, lambdaBodyBinder, diagnostics);
var result = new BoundLambda(_unboundLambda.Syntax, block, diagnostics.ToReadOnlyAndFree(), lambdaBodyBinder, delegateType, inferReturnType: true)
{
WasCompilerGenerated = _unboundLambda.WasCompilerGenerated
};
HashSet <DiagnosticInfo> useSiteDiagnostics = null; // TODO: figure out if this should be somehow merged into BoundLambda.Diagnostics.
TypeSymbol returnType = result.InferredReturnType(ref useSiteDiagnostics) ?? LambdaSymbol.InferenceFailureReturnType;
lambdaSymbol.SetInferredReturnType(result.RefKind, returnType);
return(result);
}
