https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102609
--- Comment #4 from Gašper Ažman <gasper.azman at gmail dot com> --- As one of the authors, I can assure you you never need to implement this for c++23.
gasper.azman at gmail dot com via Gcc-bugs Wed, 16 Aug 2023 11:48:59 -0700
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102609
--- Comment #4 from Gašper Ažman <gasper.azman at gmail dot com> --- As one of the authors, I can assure you you never need to implement this for c++23.