[Bug libstdc++/66742] abort on sorting list with custom allocator that is not stateless

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66742

--- Comment #15 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed downstream in my fork:
https://gitlab.com/jonathan-wakely/gcc/-/commit/18d78721bf3afaed243252a01a4f4909c17531b2