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Re: questioning let

From: Andreas Röhler
Subject: Re: questioning let
Date: Wed, 24 Feb 2010 18:29:06 +0100
User-agent: Thunderbird (X11/20081227)

David Kastrup wrote:
> Andreas Roehler <address@hidden> writes:
>> 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?
> The argument binding in arg-extern is the innermost one and consequently
> the only affected one.  If you make the function argument-less, it will
> likely work as expected by you, affecting the binding in arg-setting.

That works, thanks a lot!
However, stored in some eil.el, get a compiler warning than:

In arg-extern:
eil.el:9:9:Warning: reference to free variable `arg'
eil.el:9:17:Warning: assignment to free variable `arg'

Would think a useless warning, as the compiler should know being inside a let 


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