[Bug libstdc++/119427] std::erase_if(std::flat_map) does not work

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119427

--- Comment #1 from 康桓瑋 <hewillk at gmail dot com> ---
flat_set has the same issue.