// @dart = 2.6
class A {
  final x = null;
  const A.named1() sync* { }
  const A.named2() : x = new Object();
}
external foo(String x) { }
class B {
}
class C {
  B b;
}
abstract class AbstractClass {
  const AbstractClass.id();
}
m() { }
main() { }