[Bug c++/126797] New: explicit instantiation of function variadic template with const qualified explicit template type argument rejected

[waffl3x at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126797

            Bug ID: 126797
           Summary: explicit instantiation of function variadic template
                    with const qualified explicit template type argument
                    rejected
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: waffl3x at gcc dot gnu.org
  Target Milestone: ---

```
template<typename... Ts>
void f0 (Ts...) {}

template void f0<int const>(int const);

template<typename... Ts>
void f1 (Ts...) {}

template void f1<int const>(int);
```
https://godbolt.org/z/d8zK9zv1E
Seems to not be a regression, tested with the first version on CE that
supports c++11.