svoid dm_gazelle_matchAdditionalInput2(L<GazelleTree> l, LS preContext, O... _) {
  for (GazelleTree t : l)
    if (t.rule() != null) {
      RuleEngine2_MatchedRule mr = t.mr;
      L<TextAndType> insWithType = t.rule().insWithType;
      int iCond = t.mr.iCond;
      TextAndType next = get(insWithType, iCond);
      if (next != null && startsWith(next.type, "history-")) {
        int historyIdx = parseFirstInt(next.type);
        S line = get(preContext, l(preContext)-historyIdx);
        if (line == null) continue with print("Got no line for: " + next.type);
        SS inputMap = litmap(next.type, line);
        if (ai_ruleEngine2_matchStep(t.mr, inputMap, true, _)) {
          print("Input match OK: " + line + " - new map: " + t.mr.map + ". Updating prediction.");
          gazelle_addPredictionToTreeNode(t);
        } else
          print("Input match failed: " + line);
      }
    }
}

Began life as a copy of #1021775