From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Anaphoric macros: increase visibility Date: Sun, 15 Jan 2017 22:59:26 -0500 Message-ID: References: <87wpdyivvf.fsf@web.de> <87k29xqhqp.fsf@web.de> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1484539263 13053 195.159.176.226 (16 Jan 2017 04:01:03 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 16 Jan 2017 04:01:03 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2.50 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Jan 16 05:00:58 2017 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cSyTS-0001z6-Tl for ged-emacs-devel@m.gmane.org; Mon, 16 Jan 2017 05:00:51 +0100 Original-Received: from localhost ([::1]:54036 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cSyTU-0001Ov-Eh for ged-emacs-devel@m.gmane.org; Sun, 15 Jan 2017 23:00:52 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:56383) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cSySq-0001NR-Q7 for emacs-devel@gnu.org; Sun, 15 Jan 2017 23:00:13 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cSySm-0002hb-Ui for emacs-devel@gnu.org; Sun, 15 Jan 2017 23:00:12 -0500 Original-Received: from [195.159.176.226] (port=41428 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1cSySm-0002g5-Nm for emacs-devel@gnu.org; Sun, 15 Jan 2017 23:00:08 -0500 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1cSyST-0005kP-OX for emacs-devel@gnu.org; Mon, 16 Jan 2017 04:59:49 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 16 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:hB7/xFUzmWUGWjqNnVA8xDUXi/U= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.159.176.226 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:211317 Archived-At: >> I think the problem is in the name: it really should be called just `let`. >> It does not do any *match*, instead the pcase pattern is only used to >> specify how to *extract* the data we want. > I see. Then, `pcase-let' is somehow similar than `-let' in dash.el. That's right. It's called `pcase-let` because it's in the `pcase` package (because it uses pcase pattern syntax and implementation) and hence must use the `pcase-` prefix. The main advantage of the pcase pattern syntax is its regularity which makes it extensible (see for example the (re-match REGEXP) pcase-macro I recently posted which lets you match against a regexp and extract submatches into variables at the same time). Stefan