Does not support opening cursor with paramters

[mmh222]

Following code block errors out

    CREATE OR REPLACE PACKAGE BODY abc
    IS
       CURSOR cur_rows (num_rows NUMBER)
       IS
          SELECT tname
        FROM tab
           WHERE ROWNUM < num_rows;

       PROCEDURE x
       IS
          y   VARCHAR2 (100);
       BEGIN
          OPEN cur_rows (5);

          LOOP
         FETCH cur_rows
          INTO y;

         EXIT WHEN cur_rows%NOTFOUND;
         DBMS_OUTPUT.put_line (y);
          END LOOP;
       END x;
    END abc;