[Bug c++/106111] -Wc++20-compat doesn't warn about using `requires` as an identifier

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106111

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
And for consteval the problem is likely that enum rid has:

 273   RID_FIRST_CXX20 = RID_CONSTINIT,
 274   RID_LAST_CXX20 = RID_CONSTINIT,

Oops.