class C {
  int? m1;
  int m2 = 0;
  C get property => this;
  test() {}
  int? operator [](int index) => 0;
  void operator []=(int index, int value) {}
  method() {}
}

class D {
  D get property => this;
  test() {}
  int operator [](int index) => 0;
  void operator []=(int index, int value) {}
}

main() {}