[Bug c++/113810] New: A lambda with this auto style that captures this in a member function cannot use this pointer

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113810

            Bug ID: 113810
           Summary: A lambda with this auto style that captures this in a
                    member function cannot use this pointer
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

struct S { 
  int i = 42;
  constexpr auto f() { 
    return [this](this auto) { 
      return this->i;
    }(); 
  }; 
};

int main() {
  return S().f();
}

https://godbolt.org/z/rMqaT9r9E

GCC rejects the above with:

<source>:5:14: error: invalid use of 'this' in non-member function
    5 |       return this->i;
      |              ^~~~

But lambda captures this pointer so it should be usable.