BUG #2096: bug in a SPI sample document

The following bug has been logged online:

Bug reference: 2096
Logged by: Yoshihisa Nakano
Email address: nakano(dot)yosihisa(at)jp(dot)fujitsu(dot)com
PostgreSQL version: 8.1.0
Operating system: RedHat Enterprise Linux ES 3.0
Description: bug in a SPI sample document
Details:

There is a difference between the result of the SPI
example in the doc and the actual result of that.

Doc 40.5 Examples
=> SELECT * FROM a;
x
---
1 -- no rows in a (0) + 1
(1 row)

=> INSERT INTO a VALUES (execq('SELECT * FROM a', 0) + 1);
INFO: EXECQ: 0
INSERT 167713 1

I tried this example, but INFO showed 1, not 0. I
think the value of INFO in doc is wrong, because the
value of row is 1 at this time.

This bug seems to exist also in 7.3.x, 7.4.x and 8.0.x.