[Bug c++/104877] missing standard gnu++20 in diagnostic

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104877

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2022-03-11
           Keywords|                            |diagnostic
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=90183

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Maybe we should avoid referring to specific -std options and just say "since
C++20 or with -fconcepts" (see also PR 90183).