https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79318
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- This seems to be http://wg21.link/cwg1726
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79318
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- This seems to be http://wg21.link/cwg1726