https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95048
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- Argh, this only works if the wide encoding happens to be UCS-4 (or for 16-bit wchar_t, UCS-2) because std::codecvt_utf8 only supports converting between that and UTF-8. Which is why I used std::codecvt<wchar_t, char, mbstate_t> in the first place.
