Re: Declaring a local dynamic variable?

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

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
>>> language.
>
>> Not in Common Lisp.
>
>> (defun d1 ()
>>    (let ((var 1))
>>      (declare (special var))
>>      (l1)))
>
>> (defun l1 ()
>>    (let ((var 2))
>>      (print var)
>>      (d2)))
>
>> (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?