Postgres backend crash on alpha

The following sequence causes the backend
to crash:

CREATE TABLE test1 (a text);
CREATE TABLE test2 (b text);

CREATE RULE test_insert AS ON INSERT TO test1
DO INSTEAD INSERT INTO test2 VALUES (NEW.a);

INSERT INTO test1 VALUES ('crash');

For some reason this only occurs on the alpha platform
(tried on alpha and linux).

If I try this using ints it works fine, though. And the use
of "NEW" seems to be what's screwing it up.

Is there a fix for this?
It is crashing in the _copyConst function on this line:

length = VARSIZE(from->constvalue)

Thanks,
Mark