https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102305
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> --- Thanks, Jakub! Although this is a component=c++ bug, it also results in a libstdc++ regression, because we've been giving the wrong answer since starting to use the intrinsic (e.g. std::is_default_constructible started to use it in GCC 9.2).
