Re: Appending lists

[tomas]

On Wed, Jun 16, 2021 at 11:31:19AM -0400, Stefan Monnier via Users list for the 
GNU Emacs text editor wrote:
> tomas@tuxteam.de [2021-06-16 17:11:01] wrote:
> > On Wed, Jun 16, 2021 at 10:22:23AM -0400, Stefan Monnier via Users list for
> > the GNU Emacs text editor wrote:
> >> tomas@tuxteam.de [2021-06-16 09:28:19] wrote:
> >> > Doing (foo x y) will *never* change "the variable x" -- unless
> >> > foo is a macro/special form.
> >> 
> >> Just to show that you should never say never:
> >> 
> >>     (let* ((x 5)
> >>            (y 6))
> >>       (cl-flet ((foo (a b) (setq x (+ a b) y (* a b)) (- a b)))
> >>         (list (foo x y) x y)))
> >
> > Hey, that's cheating :-)
> 
> Impredicativity is borderline, indeed.

:-)

On a more serious note: I do learn a lot from you and would like
to say thanks.

Cheers
 - t

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