pg_migrator issue with contrib

I've been kicking the tires on this a bit, and I've found an issue when
dealing with contrib/ (specifically dblink, although I haven't looked
around anymore).

dblink_current_query() is not in the 8.4 version - when I run
pg_migrator on an 8.3 cluster that has dblink installed, I get the
following:                     
Restoring database schema
psql:/home/postgres/pg_migrator_dump_db.sql:271: ERROR:  could not find
function "dblink_current_query" in file
"/opt/dbs/pgsql84-beta2/lib/dblink.so"

There were problems executing "/opt/dbs/pgsql84-beta2/bin/psql" --set
ON_ERROR_STOP=on --port 5432 -f "/home/postgres/pg_migrator_dump_db.sql"
--dbname template1 >> "/dev/null"

pg_migrator exits leaving me with a corrupted 8.3 instance.

At the very least, a mention in the documentation of incompatible
contrib module(s) would be nice.  Even better would be a sanity check
added to prevent this.
-- 
Brad Nicholson  416-673-4106
Database Administrator, Afilias Canada Corp.