Integer parsing bug?

Section 8.1 of the manual gives the range of an integer
as -2147483648 to +2147483647.


template1=# select '-2147483648'::int;
    int4
-------------
 -2147483648
(1 row)

template1=# select -2147483648::int;
ERROR:  integer out of range

Oops.

template1=# select version();
                           version
-------------------------------------------------------------
 PostgreSQL 7.4.1 on i686-pc-linux-gnu, compiled by GCC 2.96
(1 row)

Completely vanilla build - no options other than --prefix to
configure. Clean installation, this is immediately after an initdb.

I see the same bug on Solaris, built with Forte C in 64 bit mode.

Cheers,
  Steve