!7

// to prevent endless loop!
static L<S> processing = synchroList();

p-tt {
  sendToAll("how are you");
  bot();
}

static S answer(S s) {
  if (processing.contains(s)) null;
  processing.add(s);
  try {
    L<S> l = sendToAll(s);
    ret "sent to " + n(l, "bots");
  } finally {
    processing.remove(s);
  }
}