[Bug c/117687] Wzero-as-nullpointer-constant should warn for zeros of type bool, enum, and _BitInt

[uecker at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117687

--- Comment #3 from uecker at gcc dot gnu.org ---
Examples:

https://godbolt.org/z/M5T5GPrrr


int *f()
{
    return false;
}

enum : int { E = 0 }; 

int *g()
{
    return E;
}

int *h()
{
    constexpr _BitInt(4) b = 0;
    return b;
}