import 'dart:async';

Future<List<Object>> f1() async {}
Future<Object> f3() async {}
Future<X> foo() async {}
Future<void> main() async {}
List<Object> f2() => [2];

class X {
  X(this.x, this.y);
  final x;
  final y;
  toString() => "X($x, $y)";
}

class Y {
  f(_) {}
}