https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110774
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Actually 0 vs nullptr is the same:
```
template<typename T>
struct A { typedef char* type; };
template<typename T> char* f1(T, char*); // #1
template<typename T> long* f1(T*, typename A<T>::type*); // #2
long* p1 = f1(p1, nullptr); // #3
```
That is the above also gets ambiguous.
