[Bug c++/122169] is_same_v with T=int is false; pack index

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122169

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2025-10-05
     Ever confirmed|0                           |1
           Keywords|                            |rejects-valid, wrong-code
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Reduced testcase:
```
template <class T, class T1>
struct s1;
template <class T>
struct s1<T, T> {};
template<typename... Ts>
struct s2{
        using T = Ts...[0];
        s1<const T, const int> a;
};
s2<int> t;
```