The following bug has been logged online:

Bug reference:      1526
Logged by:          Kelly Burkhart
Email address:      [EMAIL PROTECTED]
PostgreSQL version: 7.4.2
Operating system:   SuSE Linux 9.1   i386 & x86-64
Description:        SHRT_MIN out of range on explicit type conversion
Details: 

An explicit type conversion of an integer constant representing the minimum
value that type can hold results in an 'integer out of range' error.

>From psql, the following will fail:

select -32768::int2;
select -2147483648::int4;
select -9223372036854775808::int8;

If the constants are strings, there is no failure.  For instance the
following will succeed:

select '-32768'::int2;
select '-2147483648'::int4;
select '-9223372036854775808'::int8;

Also increasing the value by one does not result in failure.  The following
will succeed:

select -32767::int2;
select -2147483647::int4;
select -9223372036854775807::int8;

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