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

From: Michael Heerdegen
Subject: Re: Is `eval' allowed to modify its argument?
Date: Fri, 13 Nov 2020 12:29:37 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Stefan Monnier <> 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))


      (+ 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?



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