[BUGS] SQLSTATE exception thrown from exception handling block prevents plpgsql function from compiling

[pgagarinov]

PostgreSQL 9.0 Beta2, Windows XP Professional SP2.

The following function doesn't seem to compile in PostgreSQL 9.0 while 8.4 
accepts it with no problem.

CREATE OR REPLACE FUNCTION test.delete_sessions()
  RETURNS void AS
$BODY$
BEGIN
select 1;
EXCEPTION WHEN SQLSTATE '55P03' THEN
               RAISE SQLSTATE '55P03' using MESSAGE ='test message';
END
$BODY$
  LANGUAGE 'plpgsql' VOLATILE
  COST 100;