[Bug libstdc++/113841] Can't swap two std::hash

[ostash at ostash dot kiev.ua via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113841

--- Comment #1 from Viktor Ostashevskyi <ostash at ostash dot kiev.ua> ---
Issue is visible with -std=c++20, works fine for -std=c++17 (for both GCC12 and
Clang).