gcc/testsuite/g++.old-deja/g++.other/overload13.C

// Build don't link:
// Origin: Nathan Sidwell <nathan@codesourcery.com>

struct A {
  bool operator== (A const &);
  operator bool () const;
  operator int * () const;
};

bool foo (A &a1, A &a2)
{
  return a1 == a2;
}