for loop help - Mailing list pgsql-novice

Hi! Is it possible to know in a loop in pl/pgsql if the next element is de
last? exemple

DECLARE
asds Record;

BEGIN

FOR  asds IN EXECUTE 'select id from user_table' LOOP

    IF asds.id.next = last THEN
                ......
    END IF;

END LOOP;

tks