Bug: COPY IN doesn't test domain constraints

In CVS tip:

regression=# create domain nnint int not null;
CREATE DOMAIN
regression=# create table foo (f1 nnint);
CREATE TABLE
regression=# insert into foo values(null);
ERROR: Domain nnint does not allow NULL values -- okay
regression=# \copy foo from stdin
123
\N
\.
regression=# select * from foo;
f1
-----
123
-- not okay
(2 rows)

regression=# create domain vc4 varchar(4);
CREATE DOMAIN
regression=# create table foot (f1 vc4);
CREATE TABLE
regression=# \copy foot from stdin
1234567890
\.
regression=# select * from foot;
f1
------------
1234567890 -- not okay
(1 row)

regards, tom lane