https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78830
--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> --- There is an LWG issue requesting clarification in the standard: https://wg21.link/lwg3197 Option B is consistent with the interpretation of libstdc++ (and recent versions of libc++). If Option A or C is accepted, I will change libstdc++ accordingly. Until then, I maintain that we conform to the standard as currently written.
