ALTER TABLE ADD COLUMN can't use NOT NULL?

In the CVS tip from this morning:

a123=# alter table test add test1 int4 not null;
ERROR:  Adding NOT NULL columns is not implemented.       Add the column, then use ALTER TABLE ADD CONSTRAINT.
a123=# alter table test add test1 int4 null;
ALTER
a123=#

I'm pretty sure the first one used to work just fine.  Is this
intentional breakage?

-Brad