[Bug c++/102792] New: Internal compiler error if define lambda::operator() as friend

[fchelnokov at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102792

            Bug ID: 102792
           Summary: Internal compiler error if define lambda::operator()
                    as friend
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fchelnokov at gmail dot com
  Target Milestone: ---

This code:
```
auto f = [](auto){};

class A{
    using T = decltype(f);
    friend void T::operator()(auto) const;
};
```
results in
```
internal compiler error: in poplevel_class, at cp/name-lookup.c:5224
```
Demo: https://gcc.godbolt.org/z/TYa3b5f7o