I stumbled upon this very unusual error. I don't know if it's worth investigating, since I'm note even sure that this is legal code:

Anyway, GCC says:

test.cpp:8: internal compiler error: in digest_init, at cp/typeck2.c:709
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://bugzilla.redhat.com/bugzilla> for instructions.
Preprocessed source stored into /tmp/ccxi24ed.out file, please attach this to your bugreport.

---------------------------
here is the offending code:
---------------------------

#include <iostream>
using namespace std;

void paperino() { cout << __FUNCTION__ << endl; }
void pippo() { cout << __FUNCTION__ << endl; }

template<class T> void func(const T& x) {
    T other(x);
    other();
}

int main() {
    func(paperino);
    func(&pippo);
}