// including actual input
static LS gazelle_exactHistoryFromRule(RuleEngine2.Rule rule) {
  new Matches m;
  new LS history;
  for (GRuleLine l : unnull(rule.insWithType))
    if (eq(l.type, "standard"))
      listPut(history, 0, l.text);
    else if (startsWith(l.type, "history-", m))
      listPut(history, parseIntOpt(m.rest())-1, l.text);
  ret reversed(history);
}