Why not working under 8.3

Following lines produce an error message under 8.3. - but not under 8.1.
Why?

CREATE OR REPLACE FUNCTION dodi() RETURNS boolean AS
$$
BEGIN
SELECT 'abc' INTO TEMPORARY foonana;
RETURN FALSE;
END;
$$
LANGUAGE 'plpgsql';

FEHLER: syntax error at "TEMPORARY"
DETAIL: Expected record variable, row variable, or list of scalar variables following INTO.
CONTEXT: compile of PL/pgSQL function "dodi" near line 2

********** Fehler **********

FEHLER: syntax error at "TEMPORARY"
SQL Status:42601
Detail:Expected record variable, row variable, or list of scalar variables following INTO.
Kontext:compile of PL/pgSQL function "dodi" near line 2