owners/src/main/java/gerrit_owners/PRED_matcher_owner_2.java [84:115]:
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        if (!a2.unify(user, engine.trail)) {
          continue;
        }

        return engine.cont;
      }
      return engine.fail();
    }
  }

  private static class PRED_owner_next extends Operation {

    @Override
    public Operation exec(Prolog engine) throws PrologException {
      return engine.trust(OWNER_EMPTY);
    }
  }

  private static class PRED_owner_empty extends Operation {

    @Override
    public Operation exec(Prolog engine) throws PrologException {
      Term a3 = engine.r3;

      @SuppressWarnings("unchecked")
      Iterator<Map.Entry<String, Account.Id>> iter =
          (Iterator<Map.Entry<String, Account.Id>>) ((JavaObjectTerm) a3).object();
      if (!iter.hasNext()) {
        return engine.fail();
      }

      return engine.jtry3(OWNER_CHECK, OWNER_NEXT);
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owners/src/main/java/gerrit_owners/PRED_owner_2.java [79:110]:
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        if (!a2.unify(user, engine.trail)) {
          continue;
        }

        return engine.cont;
      }
      return engine.fail();
    }
  }

  private static class PRED_owner_next extends Operation {

    @Override
    public Operation exec(Prolog engine) throws PrologException {
      return engine.trust(OWNER_EMPTY);
    }
  }

  private static class PRED_owner_empty extends Operation {

    @Override
    public Operation exec(Prolog engine) throws PrologException {
      Term a3 = engine.r3;

      @SuppressWarnings("unchecked")
      Iterator<Map.Entry<String, Account.Id>> iter =
          (Iterator<Map.Entry<String, Account.Id>>) ((JavaObjectTerm) a3).object();
      if (!iter.hasNext()) {
        return engine.fail();
      }

      return engine.jtry3(OWNER_CHECK, OWNER_NEXT);
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