Connected to:
Oracle8i Release  8 . 1 . 7 . 4 . 1  - Production
JServer Release  8 . 1 . 7 . 4 . 1  - Production

SQL> 
SQL> 
SQL> declare
   2     cursor с_test is
   3       select RN from FORM_326;
   4   begin
   5     for var1 in с_test loop
   6       if с_test%ISOPEN then
   7         dbms_output.put_line('c_test%ISOPEN');
   8       end if;
   9       exit;
  10     end loop;
  11     if с_test%ISOPEN then
  12       dbms_output.put_line('end: c_test%ISOPEN');
  13     else
  14       dbms_output.put_line('end: not c_test%ISOPEN');
  15     end if;
  16   end;
  17   Input truncated to  1  characters
/
c_test%ISOPEN
end: not c_test%ISOPEN

PL/SQL procedure successfully completed.