final public void case_statement() throws ParseException {
    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case basic_identifier:
    case extended_identifier:
      identifier();
      jj_consume_token(151);
      break;
    default:
      jj_la1[174] = jj_gen;
      ;
    }
    jj_consume_token(CASE);
    expression();
    jj_consume_token(IS);
    case_statement_alternative();
    label_41:
    while (true) {
      switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
      case WHEN:
        ;
        break;
      default:
        jj_la1[175] = jj_gen;
        break label_41;
      }
      case_statement_alternative();
    }
    jj_consume_token(END);
    jj_consume_token(CASE);
    switch ((jj_ntk==-1)?jj_ntk():jj_ntk) {
    case basic_identifier:
    case extended_identifier:
      identifier();
      break;
    default:
      jj_la1[176] = jj_gen;
      ;
    }
    jj_consume_token(SEMICOLON);
  }