How to overload with enum type?

[Domain via Digitalmars-d-learn]

void f(int i)
{
    writeln("i");
}

void f(E)(E e) if (is(E == enum))
{
    writeln("e");
}

enum E { A }
E e = E.A;
f(e);    // output i

How can I overload with enum type?