[Bug c++/109506] [10/11/12/13 regression] -fchecking=2 causes some template constructor not be instantiated when used with NSDMI

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109506

--- Comment #9 from Sam James <sjames at gcc dot gnu.org> ---
I violated my own rule, by the way, by not saying the origin. This was found by
sultan in Gentoo when building Chromium (112, I think).