class C {
  bool operator ==(Object other) => true;
}

class D extends C {
  bool method1(dynamic o) => super == o;
  bool method2(Null o) => super == o;
  bool operator ==(Object? other) => super == other;
}

class E {
  bool operator ==() => true;
}

class F extends E {
  bool operator ==(Object? other) => super == other;
}

expect(expected, actual) {}
main() {}