Oracle PL/SQL Tutorial/SQL PLUS Session Environment/plsql line

$$plsql_line and $$plsql_unit

SQL>
SQL> CREATE OR REPLACE PROCEDURE calculate_totals
  2  IS
  3  BEGIN
  4     RAISE VALUE_ERROR;
  5  EXCEPTION
  6     WHEN OTHERS
  7     THEN
  8        DBMS_OUTPUT.put_line("Current line number " || $$plsql_line);
  9        DBMS_OUTPUT.put_line("Failed in program "|| $$plsql_unit);
 10  END calculate_totals;
 11  /
Procedure created.
SQL>
SQL> EXEC calculate_totals;
PL/SQL procedure successfully completed.
SQL>