GNU bug report logs - #40671
[DOC] modify literal objects

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Package: emacs;

Reported by: Kevin Vigouroux <ke.vigouroux <at> laposte.net>

Date: Thu, 16 Apr 2020 20:40:02 UTC

Severity: normal

Tags: patch

Done: Paul Eggert <eggert <at> cs.ucla.edu>

Bug is archived. No further changes may be made.

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From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: Mattias Engdegård <mattiase <at> acm.org>, 40671 <at> debbugs.gnu.org, Drew Adams <drew.adams <at> oracle.com>, ke.vigouroux <at> laposte.net
Subject: bug#40671: [DOC] modify literal objects
Date: Wed, 29 Apr 2020 01:52:16 +0200

Paul Eggert <eggert <at> cs.ucla.edu> writes:

> >   (let ((l (list 1 2 3)))
> >     (funcall (lambda () l)))
> >
> > Has the list become a constant?
>
> No, because the list is not part of the expression that is being evaluated.
> However, something like this could cause trouble:
>
> (let ((l (list 'lambda '(x) '(setcdr l x))))
>   (eval (list l l)))

FWIW, I asked also because `funcall' seems, at least AFAIU, share some
code with `eval', and with lexical-binding on the lambda gets
transformed into something that does include the original list, so the
list becomes part of the evaluated expression.

Michael.
This bug report was last modified 5 years and 3 days ago.

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