[Bug libstdc++/51772] --enable-clocale=generic makes unsafe assumptions about ctype_base::mask

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51772

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Related patch:
https://gcc.gnu.org/pipermail/gcc-patches/2026-January/705250.html