From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail
From: Michael Heerdegen <michael_heerdegen@web.de>
Newsgroups: gmane.emacs.help
Subject: Re: Is `eval' allowed to modify its argument?
Date: Thu, 12 Nov 2020 22:18:47 +0100
Message-ID: <87blg2l1e0.fsf@web.de>
References: <87ft5el1xr.fsf@web.de>
Mime-Version: 1.0
Content-Type: text/plain
Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214";
	logging-data="26539"; mail-complaints-to="usenet@ciao.gmane.io"
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)
To: help-gnu-emacs@gnu.org
Cancel-Lock: sha1:MqufdYFAT92ZDam1jQeDwVm2p20=
Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Thu Nov 12 22:19:54 2020
Return-path: <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org>
Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org
Original-Received: from lists.gnu.org ([209.51.188.17])
	by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
	(Exim 4.92)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org>)
	id 1kdK0Y-0006o2-SG
	for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 12 Nov 2020 22:19:54 +0100
Original-Received: from localhost ([::1]:54236 helo=lists1p.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.90_1)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org>)
	id 1kdK0X-00019O-VE
	for geh-help-gnu-emacs@m.gmane-mx.org; Thu, 12 Nov 2020 16:19:53 -0500
Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:55430)
 by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <geh-help-gnu-emacs@m.gmane-mx.org>)
 id 1kdJzf-0000Wr-4k
 for help-gnu-emacs@gnu.org; Thu, 12 Nov 2020 16:18:59 -0500
Original-Received: from static.214.254.202.116.clients.your-server.de
 ([116.202.254.214]:44678 helo=ciao.gmane.io)
 by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)
 (Exim 4.90_1) (envelope-from <geh-help-gnu-emacs@m.gmane-mx.org>)
 id 1kdJzd-0008Vc-IQ
 for help-gnu-emacs@gnu.org; Thu, 12 Nov 2020 16:18:58 -0500
Original-Received: from list by ciao.gmane.io with local (Exim 4.92)
 (envelope-from <geh-help-gnu-emacs@m.gmane-mx.org>)
 id 1kdJzZ-0005Ra-2w
 for help-gnu-emacs@gnu.org; Thu, 12 Nov 2020 22:18:53 +0100
X-Injected-Via-Gmane: http://gmane.org/
Received-SPF: pass client-ip=116.202.254.214;
 envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io
X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/12 14:32:06
X-ACL-Warn: Detected OS   = Linux 2.2.x-3.x [generic] [fuzzy]
X-Spam_score_int: -13
X-Spam_score: -1.4
X-Spam_bar: -
X-Spam_report: (-1.4 / 5.0 requ) BAYES_00=-1.9,
 FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001,
 HEADER_FROM_DIFFERENT_DOMAINS=0.25, SPF_HELO_NONE=0.001,
 SPF_PASS=-0.001 autolearn=no autolearn_force=no
X-Spam_action: no action
X-BeenThere: help-gnu-emacs@gnu.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: Users list for the GNU Emacs text editor <help-gnu-emacs.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/help-gnu-emacs>,
 <mailto:help-gnu-emacs-request@gnu.org?subject=unsubscribe>
List-Archive: <https://lists.gnu.org/archive/html/help-gnu-emacs>
List-Post: <mailto:help-gnu-emacs@gnu.org>
List-Help: <mailto:help-gnu-emacs-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/help-gnu-emacs>,
 <mailto:help-gnu-emacs-request@gnu.org?subject=subscribe>
Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org
Original-Sender: "help-gnu-emacs"
 <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org>
Xref: news.gmane.io gmane.emacs.help:125254
Archived-At: <http://permalink.gmane.org/gmane.emacs.help/125254>

Michael Heerdegen <michael_heerdegen@web.de> writes:

> is `eval' allowed to modify a list specified as FORM argument?

Can it happen when FORM is macroexpanded and an expander destructively
modifies an input expression?

Michael.