class I1<X, Y> {}
class I2<X, Y, Z> {}
class A {}
class B extends A implements I1<int, int> {
  void methodB() {}
  void methodB2() {}
  int get getterB => throw 42;
  void set setterB(int value) {}
  B operator *(B other) => throw 42;
}
class C extends B {}
class D extends C implements I2<int, int, int> {
  void methodD() {}
  int get getterD => throw 42;
  void set setterD(int value) {}
  D operator +(D other) => throw 42;
}
extension type E on D show C, I2<int, int, int>, methodD, get getterD, set setterD, operator + hide A, I1<int, int>, methodB, methodB2, get getterB, set setterB, operator * {}
main() {}