setf not working

[Ala'a Mohammad]

Hi,

Side question.

If you intend to change the value why do you use 'defvar' instead of
'defparameter'

Regards,

Ala'a

On Thu, Oct 3, 2013 at 10:48 AM, Didier Verna <didier at lrde.epita.fr> wrote:
>
>   Hello,
>
> yesterday, I fell on something extremely weird, or at least, which I
> currently fail to understand. Basically, after a (defvar *var*), there
> are times when (setq *var* '(0 0)) doesn't work (the previous value of
> *var* remains in effect).
>
> I cannot currently provide a minimal example because the situation
> involves several levels of nested macro / function calls in code I
> didn't write (*var* is solely mine though).
>
> At first, I thought I had fallen on a compiler bug, but I get the same
> behavior with at least 3 lisp implementations.
>
> I ultimately found a workaround, consisting in using (list 0 0) instead
> of '(0 0) in the assignment. I'm hoping this would be a clue to someone
> here to get at least a direction for investigating...
>
> Thanks.
>
> --
> Resistance is futile. You will be jazzimilated.
>
> Lisp, Jazz, Aïkido: http://www.didierverna.info
>