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

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

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

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org
   Last reconfirmed|                            |2022-06-28
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed, same problem with e.g.

int concept;

The problem is that cp_lexer_get_preprocessor_token has

  906           if (warn_cxx20_compat
  907               && C_RID_CODE (token->u.value) >= RID_FIRST_CXX20
  908               && C_RID_CODE (token->u.value) <= RID_LAST_CXX20)

but requires/concept aren't in the C++20 keywords, they are marked as
D_CXX_CONCEPTS_FLAGS instead.