static Runnable dm_ai_ruleToRunnable(S s) {
  L<S> l = tok_splitAtComma(s);
  if (l(l) != 2) null;
  fS cmd = second(l);
  new Matches m;
  if (!swic_trim(first(l), "whenever ", m)) null;
  final F0<Bool> cond = dm_ai_conditionToPredicate1(m.rest());
  if (cond == null) null;
  ret r {
    if (isTrue(callF(cond)))
      dm_processCommand1(cmd);
  };
}