[Bug libstdc++/119714] Failure when using == operator on a class derived from std::expected

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119714

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
https://en.cppreference.com/w/cpp/utility/expected/operator_cmp

This mentions that it is invalid for C++23 but would be valid for C++26. Looks
like we have not implemented the 26 rules either.