gcc/testsuite/g++.old-deja/g++.robertl/eb87.C

template <unsigned X, class T> struct Foo {
  friend void operator<<(int, Foo const &) {}
};
template <unsigned X> class Bar : public Foo<X,int> {};
inline Bar<0> bar(int,int,int) { return Bar<3>(); }  // ERROR - no conversion