BUG #2970: "FETCH ABSOLUTE -1" from a holdable cursor failed

The following bug has been logged online:

Bug reference:      2970
Logged by:          William ZHANG
Email address:      uniware@zedware.org
PostgreSQL version: 8.2.2
Operating system:   i686-pc-linux-gnu
Description:        "FETCH ABSOLUTE -1" from a holdable cursor failed
Details:

DROP TABLE foo;
CREATE TABLE foo(fno INT);
INSERT INTO foo VALUES(generate_series(1,5));

BEGIN TRANSACTION;
DECLARE x SCROLL CURSOR WITH HOLD FOR SELECT fno FROM foo;
-- fetch all the 5 rows.
-- after that, cursor position should be past last row.
FETCH 10 FROM x;
COMMIT WORK;
-- try to fetch the last row.
-- it failed.
FETCH ABSOLUTE -1 FROM x;
CLOSE x;