https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114018
--- Comment #16 from Jonathan Wakely <redi at gcc dot gnu.org> ---
We could also just add:
#if __cplusplus > 202002L
template<floating_point _Tp>
void
nexttoward(_Tp, long double) = delete;
#endif
The existing overloads would be preferred for float, double, long double and
integral types, so this would only be chosen for extended floating-point types.
