extension E1 on int show num {}
test1(E1 e1) {}
extension E2 on int show num hide ceil {}
test2(E2 e2) {}
extension E3 on int hide isEven {}
test3(E3 e3) {}
extension type MyInt on int show num, isEven hide floor {
  int get twice => 2 * this;
}
test() {}
main() {}