From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.help Subject: Re: Is `eval' allowed to modify its argument? Date: Fri, 13 Nov 2020 12:29:37 +0100 Message-ID: <87a6vl5wbi.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="3897"; 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:weUTTDQWaqKBrxNZpONN2d31Z9E= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Nov 13 12:30:42 2020 Return-path: 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 ) id 1kdXHt-0000vO-OJ for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 13 Nov 2020 12:30:41 +0100 Original-Received: from localhost ([::1]:38546 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kdXHs-0001kw-Qw for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 13 Nov 2020 06:30:40 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49770) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kdXH6-0001kn-4P for help-gnu-emacs@gnu.org; Fri, 13 Nov 2020 06:29:52 -0500 Original-Received: from static.214.254.202.116.clients.your-server.de ([116.202.254.214]:60534 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 ) id 1kdXH4-0005Ng-LI for help-gnu-emacs@gnu.org; Fri, 13 Nov 2020 06:29:51 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1kdXGz-000ARx-FG for help-gnu-emacs@gnu.org; Fri, 13 Nov 2020 12:29:45 +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 = 2020/11/13 06:29:47 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:125256 Archived-At: 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)) form) ==> (thunk-let* ((x (+ 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? Thanks, Michael.