slave-iv% whoami           
postgres
slave-iv% psql -V
psql (PostgreSQL) 9.1.2
contains support for command-line editing

slave-iv% make installcheck | sed -e 's/^/    /'
/usr/lib/postgresql/pgxs/src/makefiles/../../src/test/regress/pg_regress --inputdir=. --psqldir='/usr/bin'   --inputdir=test --load-language=plpgsql --dbname=contrib_regression period
(using postmaster on Unix socket, default port)
============== dropping database "contrib_regression" ==============
DROP DATABASE
============== creating database "contrib_regression" ==============
CREATE DATABASE
ALTER DATABASE
============== installing plpgsql                     ==============
CREATE LANGUAGE
============== running regression test queries        ==============
test period                   ... FAILED

======================
 1 of 1 tests failed. 
======================

The differences that caused some tests to fail can be viewed in the
file "/var/lib/postgres/PostgreSQL-Temporal/regression.diffs".  A copy of the test summary that you see
above is saved in the file "/var/lib/postgres/PostgreSQL-Temporal/regression.out".

backend=# \d test_revs
                                    Table "test.test_revs"
   Column   |           Type           |                       Modifiers                       
------------+--------------------------+-------------------------------------------------------
 id         | integer                  | not null default nextval('test_id_seq'::regclass)
 rev        | integer                  | not null default nextval('test_rev_seq'::regclass)
 status     | activatable              | not null default 'draft'::activatable
 live       | boolean                  | not null default false
 draft      | boolean                  | not null default false
 start_date | timestamp with time zone | not null default (now())::timestamp(0) with time zone
 stop_date  | timestamp with time zone | not null default 'infinity'::timestamp with time zone
 name       | character varying        | not null default ''::character varying
Indexes:
    "test_revs_pkey" PRIMARY KEY, btree (rev)
    "test_id_rev_key" UNIQUE CONSTRAINT, btree (id, rev)
    "test_draft_excl" EXCLUDE USING btree (id WITH =) WHERE (draft) DEFERRABLE INITIALLY DEFERRED
    "test_live_excl" EXCLUDE USING btree (id WITH =) WHERE (live) DEFERRABLE INITIALLY DEFERRED
    "test_period_excl" EXCLUDE USING gist (id WITH =, period(start_date, stop_date) WITH &&) DEFERRABLE INITIALLY DEFERRED
Referenced by:
    TABLE "test" CONSTRAINT "test_id_draft_fkey" FOREIGN KEY (id, draft) REFERENCES test_revs(id, rev) ON UPDATE CASCADE ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
    TABLE "test" CONSTRAINT "test_id_rev_fkey" FOREIGN KEY (id, rev) REFERENCES test_revs(id, rev) ON UPDATE CASCADE ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
    TABLE "test_rel_revs" CONSTRAINT "test_rel_test_rev_fkey" FOREIGN KEY (test_id, test_rev) REFERENCES test_revs(id, rev) ON UPDATE CASCADE ON DELETE RESTRICT DEFERRABLE INITIALLY DEFERRED
Triggers:
    _10_test_revs__upd AFTER UPDATE ON test_revs FOR EACH ROW WHEN (old.rev <> new.rev) EXECUTE PROCEDURE test_revs__upd()

backend=# select * from test_revs;
 id | rev | status | live | draft |       start_date       |       stop_date        | name 
----+-----+--------+------+-------+------------------------+------------------------+------
  1 |   1 | draft  | f    | f     | 2011-06-08 17:15:14+02 | 2011-06-08 17:15:14+02 | 
  1 |   2 | draft  | t    | t     | 2011-06-08 17:15:14+02 | 2011-06-08 17:15:14+02 | foo
(2 rows)

backend=# update test_revs set stop_date = stop_date + interval '1 sec';
ERROR:  conflicting key value violates exclusion constraint "test_period_excl"
DETAIL:  Key (id, period(start_date, stop_date))=(1, [2011-06-08 17:15:14+02, 2011-06-08 17:15:15+02)) conflicts with existing key (id, period(start_date, stop_date))=(1, [2011-06-08 17:15:14+02, 2011-06-08 17:15:15+02)).