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questioning let

From: Andreas Roehler
Subject: questioning let
Date: Wed, 24 Feb 2010 11:34:47 +0100
User-agent: Thunderbird 2.0.0.19 (X11/20081227) 
Hi,

behaviour of the example code below puzzles me. Would
expect setting of arg by external function, but inside
`let', recognised. But remains `1'.

(defun arg-setting ()
  (interactive)
  (let ((arg 1))
    (message "%s" arg)
    (arg-extern arg)
    (message "%s" arg)))

(defun arg-extern (arg)
  (setq arg (1- arg)))

Any help?

Thanks


Andreas

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