svoid gazelle_makeDefaultNoRule(S yesRuleID) {
  PairS p = gazelle_ruleTextAndComment(yesRuleID);
  if (p == null) ret;
  S question = gazelle_firstInOfRuleText(p.a);
  
  S text = question + "\n=> No";
  S extractedComment = "default rule for " + yesRuleID;
  // TODO: which comments to transfer?
  gazelle_addDerivedRules(yesRuleID, litset(text), extractedComment,
    "default");
}