https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121209
--- Comment #3 from Halalaluyafail3 <luigighiron at gmail dot com> --- (In reply to Andrew Pinski from comment #1) > So this depends on the C23 tag rules. > > Note clang errors out only on the second program and not the first. > > I am not 100% sure which is correct. I wasn't aware that Clang supported C23 tag compatibility rules, it must have been added fairly recently since it only seems to work on godbolt when using trunk.