From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: Undo defalias Date: Fri, 03 Mar 2023 10:49:57 -0500 Message-ID: References: <878rgioa5f.fsf@telefonica.net> <7c6ec4cae36f1fba2e3b@heytings.org> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="40509"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:BNzwjJpNg9hk0rDXEku8OcyxUyQ= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Mar 03 16:50:53 2023 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 1pY7gK-000AOg-CW for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 03 Mar 2023 16:50:52 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pY7fh-0006KJ-Ay; Fri, 03 Mar 2023 10:50:13 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pY7ff-0006K1-EQ for help-gnu-emacs@gnu.org; Fri, 03 Mar 2023 10:50:12 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pY7fb-00087S-DN for help-gnu-emacs@gnu.org; Fri, 03 Mar 2023 10:50:08 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1pY7fZ-0009Pq-DU for help-gnu-emacs@gnu.org; Fri, 03 Mar 2023 16:50:05 +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-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, 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: 2.1.29 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-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.help:142912 Archived-At: >> Depends on how it got set to `ignore` (you can try exiting from >> a recursive edit or a minibuffer), but in many cases it's impossible: the >> # object may simply not be reachable from anywhere any >> more :-( > It is: see the short POC code I posted. The POC you posted works only if `message` was redefined in some particular way, such as when a loading a file that has (defalias 'message #'ignore) but then it wouldn't be the result of a bug but of deliberate harm :-) AFAIK most cases where `message` can end up aliased to `ignore` is when you have code doing (cl-letf (((symbol-function 'message) #'ignore)) ...) In that case, the previous value won't be found in `function-history`. As for why is the `ignore` rebinding is still active... Stefan