Address of parameterless ref function

[Timon Gehr]

Whats the output of the following code supposed to be?

import std.stdio;

int a=0;
ref int g(){
    writeln("called g");
    return ++a;
}

void main(){
    int function() f=&g;
    writeln(cast(int)&a);
    writeln(f());
    writeln(f());
    writeln(f());
}

The output using dmd 2.052
-144918776
called g
-144918776
called g
-144918776
called g
-144918776

This is certainly wrong, as it includes an IMPLICIT cast from int* to int, but
there are happening other strange things.

How to distinguish taking the address of a call to a parameterless ref
function from taking the address of the function itself anyways?