[Bug c++/91798] Compiler rejects code due to template specialization of auto parameter value.

["pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91798

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |SUSPENDED

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
https://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1647

And maybe others.

Note my other testcase was a full specialization rather than a partial.
Here is one with a partial which removes the variadic :
```
//Get type parameter at given index.
template<auto i, class T>
struct param
{
    static_assert(i > 0, "Index into parameter pack cannot be negative!");
    using type = typename param<i - 1, T>::type;
};

template<class T>
struct param<0, T>
{
    using type = T;
};

int main()
{
    typename param<0u, int>::type x = 'a';
    static_cast<void>(x);
}
```

Both GCC and EDG agree on this while clang and MSVC disagree. This is
definitely DR 1647 then. 

So suspended as the defect report is still active.