[Bug c++/104565] New: One too many `this`es in parsing?

[ted at lyncon dot se via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104565

            Bug ID: 104565
           Summary: One too many `this`es in parsing?
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ted at lyncon dot se
  Target Milestone: ---

Regression between g++ 9.4 and 10.1:
```
struct apa {
    constexpr auto n() const { return 3; }
};

template <class>
constexpr auto f() {
    apa foo;
    int{foo.n()};  // no matching function for call to 'apa::n(apa*)'
}

int main() {}
```