https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113060
--- Comment #5 from Jiang An <de34 at live dot cn> --- Function pointers seem working (https://gcc.godbolt.org/z/Mbvfafdof). ``` template<class Ti, class Tp, class = void> constexpr bool is_array_element_initializable_from = false; template<class Ti, class Tp> constexpr bool is_array_element_initializable_from<Ti, Tp, decltype(std::declval<auto (*)(Tp&& t) -> decltype((void) array_element_initialization_tester<Ti>{{std::forward<Tp>(t)}})>() (std::declval<Tp>()))> = true; ``` So perhaps we can simply change `decltype(_Arr<_Ti>{{std::declval<_Tp>()}})` to `decltype(std::declval<auto (*)(_Tp&& __t) -> decltype(_Arr<_Ti>{{std::forward<_Tp>(__t)}})>(std::declval<_Tp>()))` to resolve this "bug".
