https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95809
--- Comment #4 from Nathan Sidwell <nathan at gcc dot gnu.org> --- The code is invalid due to DR2061
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95809
--- Comment #4 from Nathan Sidwell <nathan at gcc dot gnu.org> --- The code is invalid due to DR2061