yielding from deep

main.dart

void subsub() {
  print("I need to yield here"); // how to yield here?
}

String sub() {
  subsub();
  return "stuff";
}

Stream<String> greeter() async* {
  yield "hello";
  String c = sub();
  print(c);
  yield "something";
}

void main() async {
  await for (String g in greeter()) {
    print(g);
  }
}