problem with view/function after upgrade to 7.2

Hello there

After upgrading from 7.0.3 to 7.2 almost everything is up and running !

Except the following function/view is not working. I get an error, saying :
Missing LOOP at end of SQL expression

What has changed here ? Thanks for any help !!

Regards ... jr

CREATE FUNCTION buildString(bpchar)
RETURNS text AS '
DECLARE
list text;
rec record;
BEGIN
list := '''';
FOR rec IN SELECT z_u_umfang FROM zylinder_umfang WHERE z_u_typ = $1;
list := list || text(rec.z_u_umfang) || '','';
END LOOP;
RETURN list;
END;'
LANGUAGE 'plpgsql';

CREATE VIEW "viewrzumfang" AS
SELECT rotation.r_code, rotation.r_name, rotation.r_z_typ,
(SELECT zylinder_typen.z_laenge FROM zylinder_typen WHERE
(zylinder_typen.z_typ = rotation.r_z_typ)) AS r_z_laenge,
(SELECT zylinder_typen.z_blaenge FROM zylinder_typen WHERE
(zylinder_typen.z_typ = rotation.r_z_typ)) AS r_z_blaenge,
(SELECT zylinder_typen.z_alaenge_l FROM zylinder_typen WHERE
(zylinder_typen.z_typ = rotation.r_z_typ)) AS r_z_alaenge_l,
(SELECT zylinder_typen.z_alaenge_r FROM zylinder_typen WHERE
(zylinder_typen.z_typ = rotation.r_z_typ)) AS r_z_alaenge_r,
(SELECT rtrim(buildstring(rotation.r_z_typ), ','::text) AS rtrim) AS
r_z_umfang FROM rotation;

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