// 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;

}