https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115480
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- template<typename _Tp> struct is_trivially_copyable : public integral_constant<bool, __is_trivially_copyable(_Tp)> Well it is clang front-end issue though it looks like GCC had a similar issue too.