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: Checking conditions unrelated to expression Date: Sun, 08 Dec 2024 11:01:47 -0500 Message-ID: References: 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="6903"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:0e5BYSsx3hVW8lI51kDZM//JRBU= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sun Dec 08 17:05:30 2024 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 1tKJmk-0001cj-Cb for geh-help-gnu-emacs@m.gmane-mx.org; Sun, 08 Dec 2024 17:05:30 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tKJmO-0007ZC-L1; Sun, 08 Dec 2024 11:05:08 -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 1tKJmM-0007Y0-EJ for help-gnu-emacs@gnu.org; Sun, 08 Dec 2024 11:05:06 -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 1tKJmK-0006YT-Sv for help-gnu-emacs@gnu.org; Sun, 08 Dec 2024 11:05:06 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1tKJmI-0001GU-HV for help-gnu-emacs@gnu.org; Sun, 08 Dec 2024 17:05:02 +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: -15 X-Spam_score: -1.6 X-Spam_bar: - X-Spam_report: (-1.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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:148690 Archived-At: > Suppose I want to test (eq duck 'quack), cannot use a pcase because tests > are dependent upon featr. > > (pcase featr > ('this (do-this)) > ('that (do-that)) > (_ (message "some message")) Like Thibaut said, for this example `cond` would probably work best. But if you have good reasons to use `pcase`, you *can* do what you suggest. E.g.: (pcase featr ('this (do-this)) ('that (do-that)) (_ (if (eq duck 'quack) (do-not) (message "some message")))) or (pcase featr ('this (do-this)) ('that (do-that)) ((guard (eq duck 'quack)) (do-not)) (_ (message "some message"))) or (pcase featr ('this (do-this)) ('that (do-that)) ((let 'quack duck) (do-not)) (_ (message "some message"))) ... Stefan