Recursive types?

Consider the following:

create table foo ( id serial primary key, path text);
alter table foo add ref foo;

Table "public.foo"
Column | Type | Modifiers
--------+---------+-----------------------------------------------------
id | integer | not null default nextval('public.foo_id_seq'::text)
path | text |
ref | foo |
Indexes:
"foo_pkey" PRIMARY KEY, btree (id)

insert into foo (path) VALUES ('/');
insert into foo (path,ref) VALUES ('/foo',ROW(1,'/',NULL));
insert into foo (path,ref) VALUES
('/foo/bar',ROW(2,'/foo',ROW(1,'/',NULL)));

select * from foo;
id | path | ref
----+----------+-------------------
1 | / |
2 | /foo | (1,/,)
3 | /foo/bar | (2,/foo,"(1,/,)")
(3 rows)

However, it is not possible to create such a type using create type, as
there is no alter type, even tho alter table does the same thing.

Is this a bug or a random feature?

It is also not possible to dump and restore this using pg_dump.

... John