[Bug libstdc++/115285] [12/13 Regression] std::unordered_set can have duplicate value

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115285

--- Comment #21 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for 15 and 14.3 so far.