From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eric Abrahamsen Newsgroups: gmane.emacs.help Subject: Re: Quick pcase question Date: Thu, 03 Mar 2016 09:08:25 +0800 Message-ID: <87mvqg4bcm.fsf@ericabrahamsen.net> References: <87lh615gt8.fsf@ericabrahamsen.net> <87mvqhw3a4.fsf@web.de> <87ziuh3z6p.fsf@ericabrahamsen.net> <878u20vlwg.fsf@russet.org.uk> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1456967339 28204 80.91.229.3 (3 Mar 2016 01:08:59 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 3 Mar 2016 01:08:59 +0000 (UTC) To: help-gnu-emacs@gnu.org Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Mar 03 02:08:50 2016 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1abHl3-0000Kr-74 for geh-help-gnu-emacs@m.gmane.org; Thu, 03 Mar 2016 02:08:49 +0100 Original-Received: from localhost ([::1]:59909 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1abHl2-0006Iu-IR for geh-help-gnu-emacs@m.gmane.org; Wed, 02 Mar 2016 20:08:48 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:35991) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1abHkr-0006Ie-3r for help-gnu-emacs@gnu.org; Wed, 02 Mar 2016 20:08:38 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1abHkn-0000uW-J0 for help-gnu-emacs@gnu.org; Wed, 02 Mar 2016 20:08:37 -0500 Original-Received: from plane.gmane.org ([80.91.229.3]:42325) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1abHkn-0000u6-CY for help-gnu-emacs@gnu.org; Wed, 02 Mar 2016 20:08:33 -0500 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1abHkl-00008n-L4 for help-gnu-emacs@gnu.org; Thu, 03 Mar 2016 02:08:32 +0100 Original-Received: from 123.123.22.37 ([123.123.22.37]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 03 Mar 2016 02:08:31 +0100 Original-Received: from eric by 123.123.22.37 with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 03 Mar 2016 02:08:31 +0100 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 31 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 123.123.22.37 User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux) Cancel-Lock: sha1:trvFKM3JAx+Itu63XuDhpS5UUZ4= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.14 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.org@gnu.org Original-Sender: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.help:109406 Archived-At: phillip.lord@russet.org.uk (Phillip Lord) writes: > Eric Abrahamsen writes: > >> Michael Heerdegen writes: >> >>> Eric Abrahamsen writes: >>> >>>> (pcase tst >>>> (`(symbolla . ,(and x (pred stringp))) >>>> (message "cdr is a string: %s" x))) >>>> >>>> Is the ",(and x (pred stringp))" part really the simplest way of doing >>>> that? >>> >>> Yes, I think so. >>> >>> How could it be much simpler (there is not much redundancy in that >>> expression)? >> >> It's not so much the simplicity, I guess, as the intuitiveness -- "(and x" >> looks like a test to me, not an assignment. My brain would prefer: >> >> (,x (pred stringp)) > > What about? > > (guard (stringp ,x)) You're suggesting that as a possible alternate syntax, right? (In which case I like it.) It doesn't actually work now, does it?