From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.devel Subject: Re: pcase-if-let? Date: Tue, 17 Apr 2018 23:04:56 +0200 Message-ID: <87r2nd8ryf.fsf@web.de> References: <871sg3eqi5.fsf@web.de> <0e8139b0-b59c-1d7e-29db-66170858f8ca@lanl.gov> <87woxvd947.fsf@web.de> <87605filw6.fsf@web.de> <60dc117a-7ee2-42d2-acbc-49dae9ec6ae1@default> <871sg3ijgf.fsf@web.de> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1523999525 3947 195.159.176.226 (17 Apr 2018 21:12:05 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Tue, 17 Apr 2018 21:12:05 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) Cc: Drew Adams , Emacs Development To: Nathan Moreau Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Apr 17 23:12:01 2018 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 1f8XtQ-0000ui-VP for ged-emacs-devel@m.gmane.org; Tue, 17 Apr 2018 23:12:01 +0200 Original-Received: from localhost ([::1]:34952 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f8XvX-0006MQ-Aj for ged-emacs-devel@m.gmane.org; Tue, 17 Apr 2018 17:14:11 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:36424) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1f8Xmm-0008Cc-3U for emacs-devel@gnu.org; Tue, 17 Apr 2018 17:05:09 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1f8Xmi-0001oT-FE for emacs-devel@gnu.org; Tue, 17 Apr 2018 17:05:08 -0400 Original-Received: from mout.web.de ([212.227.15.14]:40595) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1f8Xmi-0001ZS-4Z for emacs-devel@gnu.org; Tue, 17 Apr 2018 17:05:04 -0400 Original-Received: from drachen.dragon ([188.99.168.105]) by smtp.web.de (mrweb003 [213.165.67.108]) with ESMTPSA (Nemesis) id 0MNLRJ-1f6dxw0sPp-006tOk; Tue, 17 Apr 2018 23:04:57 +0200 In-Reply-To: (Nathan Moreau's message of "Tue, 17 Apr 2018 22:26:41 +0200") X-Provags-ID: V03:K1:HcTazQKN/4W70Wd35vCzPuncrigWYhjfDlnEt2o/Kra8yoSg2EF IW3R7nH6xhM3cfBuQq5CiblO5NC4fpxqHQg74XfAG1H1lPlHcad460cFtMSlT2ULfy7xBb3 eG8+QF6nSD+sPpxDrUXT4v9jBarQCl2Zp2CopEp7pjK+Sx/qkb33+lUflcFSSrJuJdRuDCe WWOoQbJBtji1MQpMn6zow== X-UI-Out-Filterresults: notjunk:1;V01:K0:SMhyr5wuPdw=:69Vigaap7XUycoeUggaH4R kDma/w8mQrJ/0GJfhBYB5KHg8Ex58F+W86lPEIG1Ynu46Mh9P59BRi4pe3DtlvjQ/v1pSCIbv DZiZFg/EPM3pqj5NoWYuJP7EjymlB34ea3U1tXuTv9A7Tj5q8pwdHHhqz3mAUBdLIipOf/8a7 fI0fMAbVCfIApU3vOTq4S0F3UYEPyOKMzsr1S0R4MwjEfD6UjsQxH0hV9Us23MbH+l1+PPvdJ OjuvfdjxEjM+qSYDXjkbHNNNiHYWhinX9TdqiEJjPb9WYswQYpHzMzHn96smr1TUsPvc+CpAb vaEOTc7mUQ03WY3b1RMQcAoDjt47Ti70C5lD+cYmk/ZIk6IeE4i+H/O5dfWTZLNangMIxtgrP sbKUozfv+a85xGjH7LXSPjPZRtUjM27dR/FjxxkpXQjVPOAnclQ5xR/+98UkwEbGLlaKMLCyC rpZwjL+Rag9dOavstha1LBqV4h/MFWGFL30V6QK+F973Q5SpaR0KptJrKlVl3fL+UQG7WfjiR da8LD0t6hk/A4YvtvO5UqNsfix/gfmoOdOl/8+sQAKgb/Zazu/7nkfKMOWUnZ7LcF3M3OTVSZ R/e/WkOA4mLGfH6/LBuH/KI5loRt9O54m9+uLt5f0X1bbY7CVQpgMSVrAaPPIqm1unbjmDniU ILBZKks5heY9V9d1/wsmZilZIjipIQhjITVD9kT493Nn0JsVi/bCGGjlld1HrR0uHaDZV9Fh0 VhOG77UU/itl6+3Yor8Q3mv+rPN3lesqqmmP67tVDWYWjGOafWlFkgc5vvwfYKDASR/dGEy/ X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 212.227.15.14 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:224714 Archived-At: Nathan Moreau writes: > (pcase-if > ((`(,q . ,r) '()) > (`(,s . ,u) '(b c))) > (list q r s u 'ok) > 'nope) > => nil > > > ? > I would have expected 'nope instead. Sure, good catch. There's a catchall rule missing in my implementation that evaluates the else forms when matching fails (like above). A better implementation would probably more look like that of `pcase-let*'. Seems I already get something like pcase-if when I change the pcase--dontcare rule in `pcase--let*'. Thanks, Michael.