// rules are t3(text, comment, ruleID)
static GazelleEvalContext gazelle_stdEvalContext_v2(L<T3<S>> rules, O... _) {
  long startTime = sysNow();
  new GazelleEvalContext ctx;
  ctx.engine = new RuleEngine2;
  ctx.engine.addRules2(rules);
  gazelle_changeInTypesForRulesWithMultipleInputs(ctx.engine);

  // gather data for predictor
  MultiSet<S> statements = dm_gazelle_statementsFromAppliedRules_multiSet();
  ctx.dataByRule = new Map;
  Map<S, MultiSet<S>> statementsByRule = ai_gazelle_indexStatementsByRule_multiSet(statements);
  for (S ruleID, MultiSet<S> statements2 : statementsByRule) {
    ctx.dataByRule.put(ruleID, ai_gazelle_analyzeStatementsForRule_multiSet(statements2));
  }
  
  ctx.predictor = dm_gazelle_standardPredictor(_);
  done2(startTime, "Making engine with " + n2(rules, "rule"));
  ret ctx;
}

Began life as a copy of #1021684