https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65547
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Edward Diener from comment #3) > Where do you get the idea that the standard doesn't require an error, it > requires a diagnostic message ? 1.4 [intro.compliance], the text I quoted. Where do you get the idea it requires an error?