[Bug c++/112775] Class template partial specialization with decltype(n) is wrongly rejected

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112775

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note the workaround is to do just this:
```
template <class T, T n>
class A<T, n, n> {};
```