BUG #6583: for loop cursor

The following bug has been logged on the website:

Bug reference:      6583
Logged by:          Biju George
Email address:      biju.george@ust-global.com
PostgreSQL version: 8.4.0
Operating system:   Linux
Description:=20=20=20=20=20=20=20=20

Just this simple code throws below error --
CREATE OR REPLACE FUNCTION my_temp_func(v_acc_type integer)
  RETURNS void AS
$BODY$
declare
v_cur cursor (acc_num integer) is select pid from public.my_trade_table
where acc_type =3D acc_num;
begin
for record_var in v_cur(v_acc_type) loop
raise notice 'ID is %',record_var.id;
end loop;
end;
$BODY$
  LANGUAGE plpgsql;

------------Error---------------
ERROR:  syntax error at or near "$1"
LINE 1:   $1 ( $2 )
          ^
QUERY:    $1 ( $2 )
CONTEXT:  SQL statement in PL/PgSQL function "my_temp_func" near line 4

********** Error **********

ERROR: syntax error at or near "$1"
SQL state: 42601
Context: SQL statement in PL/PgSQL function "my_temp_func" near line 4