Port Bug Report: Parser error

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Nicolas GIMMILLARO
Your email address : nicolas(at)wmi(dot)fr

Category : runtime: back-end: SQL
Severity : non-critical

Summary: Parser error

System Configuration
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Operating System : Linux 2.0.36 ELF (Slackware)

PostgreSQL version : 6.4.1

Compiler used : 2.7.2

Hardware:
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P200 MMX, 96 M RAM , 4.1 Go SCSI
Linux wmi 2.0.36 #1 Fri Dec 18 09:57:18 MET 1998 i586

Versions of other tools:
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GNU Make version 3.74
flex version 2.5.4

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Problem Description:
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When using a 'IN (..,..,..)' statment with a negativ number, I get a parser error

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Test Case:
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wmi=> select * from devis where no_devis in (-1,0,1,2);
ERROR: parser: parse error at or near "-"

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Solution:
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