[Bug libstdc++/115939] Cannot unambiguously compare iterators in std::unordered_map with mapped type std::expected>

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115939

--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Agreed, that's what the patch in comment 3 is for, and that's why I implemented
that before working on the std::expected changes.