pg_dump of regression db?

I thought I would test the latest changes to pg_dump on the regression db,
and got the following output for an aggregate:
   CREATE AGGREGATE newcnt (BASETYPE = opaque, SFUNC = int4inc, STYPE =
int4, INITCOND = '0' );

Unfortunately, the backend produces the following error when this statement
is executed:
   ERROR:  AggregateCreate: Type 'opaque' undefined

I vaguely recall seeing something about pg_dump not working of the
regression db, but would be interested to know if this is the known
problem, and if there is any value in trying to fix it. 

psql shows the following:

regression=# \da newcnt        List of aggregates Name  |    Type     | Description
--------+-------------+-------------newcnt | (all types) |
(1 row)

whereas in 7.0.2, it shows int4, so my guess is that this is a problem with
pg_dump and the new function manager.

Any suggestions would be appreciated.



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