[Bug c++/107853] [10/11/12/13 Regression] variadic template with a variadic template friend with a requires of fold expression

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107853

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |9.5.0
           Keywords|                            |ice-checking,
                   |                            |ice-on-valid-code
      Known to fail|                            |10.1.0
   Target Milestone|---                         |10.5
            Summary|variadic template with a    |[10/11/12/13 Regression]
                   |variadic template friend    |variadic template with a
                   |with a requires of fold     |variadic template friend
                   |expression                  |with a requires of fold
                   |                            |expression

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I am not 100% sure we can call this a regression but GCC 9.5.0 accepts the code
for the first example.

The second example looks like it only ICEs with checking enabled ...