enum E<X> {
  one(1),
  two("2");

  final X field;
  const E(this.field);
}

test() {}
foo(E<int> ei, E<String> es) {}
bar(E<int> ei, E<String> es) {}
baz(E<Object> ei, E<Object> es) {}
boz(E<Never> ei, E<Never> es) {}
checkIsType<T>(x) {}
checkIsNotType<T>(x) {}
main() {}