extension E<U> on String {
  U field1 = null;
  int? field2 = () { U x = null; return null; }();
  List<U>? field3 = null;
  U Function(U)? field4 = null;
  List<U> Function(List<U>)? field5 = null;
  int? field6 = <E>() { E? x = null; return null; }<String>();
  int? field7 = <E>() { E? x = null; return null; }<U>();
  Type field8 = U;
}
main() {}