class A<X> {}
class B<X> extends A<X> {}
class C extends B<int> {}
extension type E on C show B<int> hide A<int> {}
class A2 {}
class B2 extends A2 {}
class C2 extends B2 {}
extension type E2 on C2 show B2 hide A2 {}
class A3 {
  void foo() {}
  int? field;
  String? field2;
  int get getter => 42;
  void set setter(int value) {}
  void set setter2(int value) {}
  void set setter3(int value) {}
  A3 operator +(A3 other) => other;
  A3 operator *(A3 other) => this;
}
class B3 extends A3 {
  void bar() {}
}
class C3 extends B3 {
  void baz() {}
}
extension type E3 on C3 show B3, baz, field, setter, set field2, operator + hide foo, get field, getter, setter2, set setter3, operator * {}
main() {}