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 (){}
test() {}
main() {}