[Bug c++/118305] Wrong auto type used for array bounds of template argument

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118305

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2025-01-05
     Ever confirmed|0                           |1
            Summary|Wrong deduced type for      |Wrong auto type used for
                   |array bound                 |array bounds of template
                   |                            |argument
             Status|UNCONFIRMED                 |NEW
      Known to fail|                            |8.1.0

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Interesting this works:
```
template<typename T, typename T1, T N>
constexpr T size(T1 (*)[N]) {
    return N;
}
using size_t = decltype(sizeof 0);
using size_t = decltype(::size(static_cast<int (*)[1]>(0)));
```

Confirmed. Not a regression.