https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97773
--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think it's just a dup of PR 82099.
Reduced further to only use C++14
template <typename T>
struct hash
{
int operator()(T) const noexcept { return 0; }
};
template <typename T>
int hash_combine(T v) noexcept(noexcept(hash<T>()(v)))
{
return 0;
}
template<typename F, typename T>
auto
apply(F& f, T t)
{
return f(t);
}
auto x = apply(hash_combine<int>, 0);
