https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115420
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> --- We could even do: /home/jwakely/gcc/15/include/c++/15.0.0/bits/hashtable.h:78:58: error: static assertion failed: std::hash specialization is disabled; maybe the correct header has not been included
