[Bug c++/97476] New: Use of NTTP placeholder checked for CTAD before instantiation

[johelegp at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97476

            Bug ID: 97476
           Summary: Use of NTTP placeholder checked for CTAD before
                    instantiation
           Product: gcc
           Version: 11.0
               URL: https://godbolt.org/z/ocWhn8
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: johelegp at gmail dot com
                CC: johelegp at gmail dot com
  Target Milestone: ---

See the URL.
```C++
template <int I> struct S { };
template <S s> class C { };
template <S s> using A = C<s>;
```
[93083](https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93083) may be a duplicate
of this.