https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78058
--- Comment #1 from Andrzej Krzemienski <akrzemi1 at gmail dot com> --- Fore some background, the bug is caused by GCC correctly implementing p0032r2. Technically GCC is compliant with N4604, however the tags as specified in 20.2 are buggy, as can be seen in the initial example, and as expressed in National Body comments CH 3 and FI 7 (in p0488r0).
