Re: Is `eval' allowed to modify its argument?

[Michael Heerdegen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> I can imagine cases where one might think it's a good idea to do so,

I suspect in most cases it happens by accident.  My case is thunk-let*
(AFAIR I was related in implementing it...):

(let ((form '(thunk-let* ((x (+ 1 2))
                          (y (+ x 3)))
               (* x y))))
  (ignore (macroexpand form))
  form)

==>

 (thunk-let*
    ((x
      (+ 1 2))) ;; second binding of FORM is gone!
  (* x y))

So do we consider that a bug in `thunk-let*'?  How much similar cases do
you think can we expect?


Thanks,

Michael.