Port Bug Report: parse error with Factorial

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name        : Volker Paul
Your email address    : vpaul@dohle.com

Category        : unknown
Severity        : non-critical

Summary: parse error with Factorial

System Configuration
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  Operating System   : Linux

  PostgreSQL version : 6.4

  Compiler used      :

Hardware:
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Linux helena 2.1.131 #1 SMP Thu Dec 17 15:11:02 MET 1998 i686 unknown

Versions of other tools:
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Problem Description:
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zeit=> select 5! ;
ERROR:  parser: parse error at or near ""
zeit=> select 5! +0 ;
?column?
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     120
(1 row)

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Test Case:
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see above

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Solution:
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solution: add "+0"

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