[Bug c++/71125] [concepts] Spurious 'invalid reference to function concept error' issued when overloads are not all declared with the concept specifier

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71125

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2019-10-14
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Is this valid in C++20?

I think G++ is correct to reject it due to redeclaring C1, C2 etc. as a
different kind of symbol.