Why doesn't this C# code compile when using named parameters?

Question

Baffled.

class Test
{
    void Main()
    {
        F(() => "");                // ok
        F(named: () => "");         // 'T' cannot be inferred from the usage!
        F<string>(() => "");        // ok
        F<string>(named: () => ""); // ok
    }

    void F<T>(Func<T> named) { }
}

Could someone tell me why the second call to F fails to compile?

(Note that this is a significantly stripped down example, which is why it seems synthetic. In the real case I came across, there are some default parameters before 'named' and so the named parameter is required. And so, apparently is explicit specification of 'T' by the caller.)

Answer 1

Seems like an inadequacy in the compiler's delegate type inference...sorry I can't offer more.