Re: Is this a bug of Emacs-Lisp?

[Sascha Wilde]

Zhang Wei <address@hidden> wrote:

> (defun dummy () '(1 . 2))
>
> (dummy)
>  => (1 . 2)
>
> (setcdr (dummy) 3)
>
> (dummy)
>  => (1 . 3)
>
> Modify the return value of dummy changed it's defination.

No.  The function dummy returns a cons cell -- all ways the _same_
cons cell, so if you change it, well it ends up changed.  :-)

What you might want is:

(defun dummy () (cons 1 2))

cheers
sascha
-- 
Sascha Wilde

Lisp is the red pill.
  -- John Fraser, comp.lang.lisp