Re: questioning let

["Andreas Röhler" <andreas.roehler@easy-emacs.de>]

David Kastrup wrote:
> Andreas Roehler <andreas.roehler@online.de> 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 (?)

Andreas