static CloseableShortIterator decodeOpusStream(S url) throws IOException {
  temp var res = tempResources();
  var in = res.add(httpInputStream(url));
  OpusMachine machine = res.add(new OpusMachine(in));

  on clean exit { res.forget(); }
  
  ret new OpusMachineIterator(machine);
  //ret with(() -> res.forget(), new OpusMachineIterator(machine));
  //OpusMachineIterator iter = new(machine);
}