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Re: e and pi

From: Wojciech Meyer
Subject: Re: e and pi
Date: Fri, 17 Sep 2010 17:06:02 +0100

On Fri, Sep 17, 2010 at 4:50 PM, Chong Yidong <address@hidden> wrote:
> Stefan Monnier <address@hidden> writes:
>> in the current lexbind branch (where e is defined as a global/dynamic
>> variable), the below code would not do the same:
>>   (defun make-inc (e)
>>     (lambda (f) (+ e f)))
>> because "e" happens to be a predefined global variable with
>> dynamic-scoping semantics.
> This doesn't sound right---it means that people will have to make sure
> their function args do not coincide with any defvar, defined anywhere.
> It won't just be "e" and "pi" causing problems.  Someone might write
>  (defun froob (argv)
>     (lambda (f) (cons f argv)))
> and have that fail, because "argv" is a defvar defined in startup.el.

That's why defvars should be with prefix.


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