Negative integer constants don't work with "between" operator.

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Jochen Topf
Your email address : jochen@remote.org

System Configuration
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Architecture (example: Intel Pentium) : Intel Pentium

Operating System (example: Linux 2.0.26 ELF) : Linux 2.0.35, RedHat 5.2

PostgreSQL version (example: PostgreSQL-6.5.1): PostgreSQL-6.5.1

Compiler used (example: gcc 2.8.0) : RPMs vom ftp.postgresql.org

Please enter a FULL description of your problem:
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Negative integer constants don't work with "between" operator.

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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This works:
test=> create table x (y int check (y >= -1 AND y <=99) );
CREATE

This doesn't:
test=> create table x (y int check (y between -1 and 99) );
ERROR: parser: parse error at or near "-"

If you know how this problem might be fixed, list the solution below:
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