[Bug c++/109859] [12/13/14/15 Regression] ICE on concept mis-typed as template type parameter

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109859

--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Another test:

```
template<typename>
concept A = true;

template<auto = []<A> {}>
int x;

int main() {}
```