setf not working

[Willem Broekema]

On Thu, Oct 3, 2013 at 8:48 AM, Didier Verna <didier at lrde.epita.fr> wrote:

> 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 guess you are modifying the value of *var*, which is not allowed if it is
a quoted list. That's why you need e.g. (list .. ..) or (copy-tree '(..
..)) instead of '(.. ..).
http://stackoverflow.com/questions/10365470/modifying-a-list-passed-as-a-parameter-gives-different-results-in-sbcl-and-clisp

- Willem
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