[Bug c++/97700] Bogus error when a class containing a function pointer is used as a non-type template parameter

[mail at lboeger dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97700

--- Comment #5 from Lukas Böger <mail at lboeger dot de> ---
One part of this seems to be resolved with version 13. Below, only the lambda
use case fails to compile, whereas prior to version 13, both type aliases are
rejected:

```
void fun() {}
struct S 
{ 
    void (*f)(); 
}; 

template<S> struct X {};

using works = X<S{ fun }>;
using does_not_work = X<S{ []{}}>;
```

See https://godbolt.org/z/3E7WE6zKo