CREATE SCHEMA aries;

CREATE DOMAIN aries.d_id
   AS character( 32 )
   DEFAULT ''
   NOT NULL;

CREATE TABLE aries.ttest
(
  nindex aries.d_id
) 
WITHOUT OIDS;

CREATE OR REPLACE FUNCTION aries.get_test(OUT nindex aries.d_id) 
RETURNS record AS
$$
BEGIN
  DECLARE 
  cur record;
  FOR cur IN SELECT aa.nindex FROM aries.ttest aa
  LOOP
    nindex=cur.nindex;
    next record;
  END LOOP;
END
$$
LANGUAGE 'plpgsql' VOLATILE;

ERROR: function result type must be aries.d_id because of OUT parameters
SQL state: 42P13

ERROR: syntax error at or near "FOR"
SQL state:  42601 
Character:  204 

ERROR: syntax error at or near "FOR"
SQL state:  42601 
Character:  204