static O pcallFAll_returnFirstNotNull(Collection l, O... args) {
  if (l != null) for (O f : cloneList(l))
    try object pcallF(f, args);
}

static void pcallFAll_returnFirstNotNull(Iterator it, O... args) {
  while (it.hasNext())
    try object pcallF(it.next(), args);
}