On Thu, Jun 17, 2021 at 01:25:27AM +0200, Emanuel Berg via Users list for the GNU Emacs text editor wrote:
> Philip Kaludercic wrote:
> 
> >>> (let* ((list-1 '(a b c))
> >>>         (list-2 (nconc list-1 '(1 2 3))))
> >>                    ^^^^ not recommended: '(a b c) is a "constant object"
> >>                         Some version of elisp might even refuse to do that!
> >
> > True, I wanted to do (list 'a 'b 'c) but I didn't want to
> > change the example that much.
> >
> > Also, what versions of elisp wouldn't allow that?
> 
> Probably a typo, should be dialects of Lisp...

I was actually thinking about possible future versions
of elisp (hey, we're getting a native compiler now, so
that's the direction we're moving).

Cheers
 - t