[Bug c++/92944] [concepts] redefinition error when using constrained structure template inside namespace

[ed at catmur dot uk via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92944

--- Comment #2 from Ed Catmur <ed at catmur dot uk> ---
Sorry, meant to link this:
https://quuxplusone.github.io/blog/2021/10/27/dont-reopen-namespace-std/