class A {
  A.new();
  factory A.redirectingFactory() = A.new;
  factory A.redirectingFactoryChild() = B.new;
  A.redirecting() : this.new();
}

class B extends A {}

class C {
  final int x;
  const C.new(this.x);
}

class D extends C {
  D(int x) : super.new(x * 2);
}

test() {}
main() {}