Missing asyncStart/asyncEnd in async/StreamController/stream_all_A01_t02

[osa1]

import "dart:async";
import "../Stream/allTests_A02.lib.dart";

Stream<T> create<T>(Iterable<T> data,
    {bool isError(T element)?, T? defaultValue}) {
  StreamController<T> sc = new StreamController<T>();
  for (T e in data) {
    if (isError != null && isError(e)) {
      sc.addError(e as Object);
    } else {
      sc.add(e);
    }
  }
  new Future(() => sc.close()); // close stream controller later
  return sc.stream;
}

main() {
  test(create);
}

Here we need a asyncEnd after sc.clone, and a corresponding asyncStart somewhere.

I'm not sure where would be the best for asyncStart. Ideally we want just one asyncStart with the right argument. I don't know if it's possible in this test.