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

Question

Upset.

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) { }
}

Can someone tell me why the second call to F will not compile?

(Note that this is a significantly truncated example, so it seems synthetic. In the real case, when I came across, there are some default parameters before "named", and therefore a named parameter is required. Explicit specification of the "T" of the caller.)

Answer 1

It seems like the inadequate output of the compiler delegate type ... sorry, I can not offer more.