[Bug libstdc++/89118] Illegal memory access in codecvt::out()

[vagran.ast at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89118

--- Comment #1 from vagran <vagran.ast at gmail dot com> ---
If using std::locale::classic() it additionally does not return valid result as
well. According to standard it should. See notes:
https://en.cppreference.com/w/cpp/locale/locale/classic.