https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16191
--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Looks like the resolution of DR1710 (though it was supposed to be C++17+) causes the code without the template to be accepted which means this should be rejected for C++98, C++03, C++11 and C++14 ....
