Use await for with broadcast stream and return

await_for_broadcast_stream.dart

import 'dart:async';

main() async {
  print('invoking bar');
  await bar();
  print('bar returned');
}

Future bar() async {
  int i = 0;
  await for (var item in stream()) {
    print(item);
    if (i++ == 5) {
      return;
    }
  }
}

Stream stream() {
  StreamController s;
  s = StreamController.broadcast(onListen: () async {
    int i = 0;
    emit() {
      s.add(i++);
      Timer.run(emit);
    }
    emit();
  });
  return s.stream;
}