final public void index_constraint() throws ParseException {
    jj_consume_token(152);
    discreteRange();
    label_28:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case 150:
        ;
        break;
      default:
        jj_la1[109] = jj_gen;
        break label_28;
      }
      jj_consume_token(150);
      discreteRange();
    }
    jj_consume_token(153);
  }