https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103726
--- Comment #5 from cqwrteur <unlvsur at live dot com> --- (In reply to Jonathan Wakely from comment #4) > (In reply to Jonathan Wakely from comment #2) > > cppreference is wrong, <coroutine> is not freestanding. > > I've fixed it now. thank you.