Altering Domain Constraints on composite types

While playing with domains and composite types, I discovered a problem
when I tried to alter a domain constraint. I don't believe that this
problem exists for traditional types.

for example:

broersr=> insert into tags values ((84,'PDSL',1,''),(84,'P',1, ''),'TEST TAG');
ERROR: invalid regular expression: invalid repetition count(s)
broersr=> \dD

List of domains
Schema | Name | Type |
Modifier | Check
--------+----------------------+-----------------------+----------------------------------------+-------------------------------------------------------
...
public | tag_function | character varying(4) | not null
| CHECK (VALUE::text ~ '^[A-Z]{2-4}$'::text)
...
(11 rows)

broersr=> --oops I made a mistake in the definition of my REGEX
constraint so lets fix it.

broersr=> begin;
BEGIN
broersr=> alter domain tag_function drop constraint valid_tag_function;
ALTER DOMAIN
broersr=> alter domain tag_function add constraint valid_tag_function
check(value ~ E'^[A-Z]{2,4}$');
ERROR: cannot alter type "tag_function" because column "tags"."tag" uses it
broersr=> rollback;
ROLLBACK

--
Regards,
Richard Broersma Jr.

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