GOTO in PL/SQL

SQL> SET SERVEROUTPUT ON;
SQL>
SQL> DECLARE
  2     k   NUMBER := 10;
  3     v   NUMBER := 1;
  4  BEGIN
  5     GOTO hai;
  6
  7     IF k = NULL
  8     THEN
  9       <<hai>>
 10        v := v + 21;
 11     END IF;
 12
 13     /*<<hai>>
 14      v := v + 2;*/
 15
 16     DBMS_OUTPUT.put_line ('v=' || v);
 17  END;
 18  /
   GOTO hai;
   *
ERROR at line 5:
ORA-06550: line 5, column 4:
PLS-00375: illegal GOTO statement; this GOTO cannot branch to label 'HAI'
ORA-06550: line 8, column 4:
PL/SQL: Statement ignored


SQL>