[Bug libstdc++/107761] Implement C++23

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107761

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
What does "inspired by" mean? We need to be careful of authorship, copyright
ownership, and licensing.