[Bug c++/121705] [16 Regression] When using import std, formatting std::chrono::year_month_day will cause compilation failure

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121705

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Probably r16-1709-g4b3cefed1a0834