unable to refer the record type using table type

 hi,

i am getting some error when i am referring a table type which is define don record type

declare

type t_rec is record (v_emp emp%rowtype);

type t_tab is table of t_rec;

l_tab t_tab;

begin

select * bulk collect into l_tab from emp where empno=7788;

dbms_output.put_line(l_tab)

end;

please give some explanation on this.

Thanks in Advance