[Bug c++/99967] New: gcc accepts declaration type contains unexpanded parameter pack

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99967

            Bug ID: 99967
           Summary: gcc accepts declaration type contains unexpanded
                    parameter pack
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/cdqq3ocTG

template <class...> concept C = true;

template <typename... Ts> void f() { C<Ts> auto x = 0; };

int main() { f(); }

gcc accepts it.