From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Richard Stallman Newsgroups: gmane.emacs.devel Subject: Re: pcase bindings in patterns with complicated logic Date: Wed, 17 Jan 2024 22:37:53 -0500 Message-ID: References: <87il3xt38w.fsf@localhost> <875xzwjta2.fsf@posteo.net> <878r4rsyyt.fsf@localhost> <87r0ijj48v.fsf@posteo.net> <871qajsx5z.fsf@localhost> <87le8riyvp.fsf@posteo.net> <87r0ihl8lr.fsf@localhost> Reply-To: rms@gnu.org Content-Type: text/plain; charset=Utf-8 Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="1931"; mail-complaints-to="usenet@ciao.gmane.io" Cc: thievol@posteo.net, emacs-devel@gnu.org To: Ihor Radchenko Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Jan 18 04:38:28 2024 Return-path: Envelope-to: ged-emacs-devel@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 1rQJEa-0000Ia-JZ for ged-emacs-devel@m.gmane-mx.org; Thu, 18 Jan 2024 04:38:28 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rQJE7-0008Ld-JN; Wed, 17 Jan 2024 22:37:59 -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 1rQJE3-0008LN-2b for emacs-devel@gnu.org; Wed, 17 Jan 2024 22:37:55 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rQJE2-0006BV-3V; Wed, 17 Jan 2024 22:37:54 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=Date:References:Subject:In-Reply-To:To:From: mime-version; bh=oe16hzZncGqT8AlVgMZFVk3IolDpMOLbIVrQ0joUOnM=; b=YJhs4I+cwGrs DEv9QUXx9kUlXHvW0EfysRqVpxDOftsSEOuQVzV6PC9xWK/T2z2nUYBV5kQCjwmA9C8N/9gRW9jiW 2LTB4FsZIpCQATHAmZ72R42iL32yjDeTzrD/j/wOHAGFXz0tZwnt8PQgE6aXymIpAG9tJTVLKKbLk 1Y3IQhvw70q95fCpP8GrdBPa3EpF47RvnOfU0wEIeCoyI5jbXSuiPTsSu2dtp88ZHycFX8ymakmsW +zJBnPfoUAGkX1Q6RgntTbfgRDm88u8LcguBBZ7OV47hWlo3zFaJJv8mSxf3tYWx1Gm1Ao8U6zN+5 ZA/WztRhsSP/3pWuFJToDQ==; Original-Received: from rms by fencepost.gnu.org with local (Exim 4.90_1) (envelope-from ) id 1rQJE1-0001YW-Rk; Wed, 17 Jan 2024 22:37:53 -0500 In-Reply-To: <87r0ihl8lr.fsf@localhost> (message from Ihor Radchenko on Tue, 16 Jan 2024 13:18:40 +0000) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:315067 Archived-At: [[[ To any NSA and FBI agents reading my email: please consider ]]] [[[ whether defending the US Constitution against all enemies, ]]] [[[ foreign or domestic, requires you to follow Snowden's example. ]]] > > cond* can do this without introducing a special feature for it: > > > > (cond* ((match* `(2 ,c) (cdr '(1 2 3))) > > (format "Match: %S" c))) > What about > (pcase '(1 2 3) > ((and `(1 . ,_) > (app cdr `(2 ,c))) > (format "Match: %S" c))) That uss, once again, the construct `app'. pcse can do this but needs a special feature to do it. The point is that cond* can do this without the need of a special extra feature. -- Dr Richard Stallman (https://stallman.org) Chief GNUisance of the GNU Project (https://gnu.org) Founder, Free Software Foundation (https://fsf.org) Internet Hall-of-Famer (https://internethalloffame.org)