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Re: Declaring a local dynamic variable?

From: Andreas Röhler
Subject: Re: Declaring a local dynamic variable?
Date: Fri, 27 Sep 2013 11:53:44 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130801 Thunderbird/17.0.8

Am 25.09.2013 20:53, schrieb Stefan Monnier:
So in essence Emacs doesn't really have local dynamic variables?
Dynamic scoping is inherently global, whether in Elisp or in any other

Not in Common Lisp.

(defun d1 ()
   (let ((var 1))
     (declare (special var))

(defun l1 ()
   (let ((var 2))
     (print var)

(defun d2 ()
   (declare (special var))
   (print var))

D1 and D2 use the dynamic variable VAR, L1 uses the lexical variable VAR.

Same in Elisp.  But if d1 and d2 are in two separate packages that know
nothing about each other but who happen to call each other through some
potentially twisted sequence of calls, they will still interfere,
because there's only (globally) one dynamic variable by that name.

Now if two separate packages define a lexical var with the very same, is such a 
confusion excluded?

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