No error reported for duplicate ref in lambda signature

[cston]

No errors are reported for lambda signatures below:

delegate void D(ref int i);

class Program
{
    static void Main()
    {
        D d1 = (ref ref int i) => { };
        D d2 = (in ref int i) => { };
        D d3 = (out ref int i) => { };
    }
}

[Youssef1313]

The error for other symbols come from

roslyn/src/Compilers/CSharp/Portable/Symbols/Source/ParameterHelpers.cs

Line 19 in 69bdfb2

public static ImmutableArray<ParameterSymbol> MakeParameters(

But it looks like lambdas have their own MakeParameters:

roslyn/src/Compilers/CSharp/Portable/Symbols/Source/LambdaSymbol.cs

Line 303 in 220b3eb

private ImmutableArray<ParameterSymbol> MakeParameters(

[cston]

But it looks like lambdas have their own MakeParameters:

Yes, thanks. I'm changing Binder.AnalyzeAnonymousFunction() to use ParameterHelpers.CheckModifiers() and ParameterHelpers.GetModifiers().

[cston]

Fixed in #62155.