From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.bugs Subject: bug#13422: 24.2.91; Feature request: Add a macro always expanding to nil Date: Sat, 12 Jan 2013 19:34:54 -0500 Message-ID: References: <87ip72jnbr.fsf@web.de> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1358037360 15887 80.91.229.3 (13 Jan 2013 00:36:00 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 13 Jan 2013 00:36:00 +0000 (UTC) Cc: 13422@debbugs.gnu.org To: michael_heerdegen@web.de Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Jan 13 01:36:17 2013 Return-path: Envelope-to: geb-bug-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 1TuBYa-00086H-0m for geb-bug-gnu-emacs@m.gmane.org; Sun, 13 Jan 2013 01:36:12 +0100 Original-Received: from localhost ([::1]:34491 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TuBYJ-0008TG-Rm for geb-bug-gnu-emacs@m.gmane.org; Sat, 12 Jan 2013 19:35:55 -0500 Original-Received: from eggs.gnu.org ([208.118.235.92]:57801) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TuBYF-0008T9-El for bug-gnu-emacs@gnu.org; Sat, 12 Jan 2013 19:35:54 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TuBYB-0004ZV-7q for bug-gnu-emacs@gnu.org; Sat, 12 Jan 2013 19:35:51 -0500 Original-Received: from debbugs.gnu.org ([140.186.70.43]:51940) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TuBYB-0004ZR-44 for bug-gnu-emacs@gnu.org; Sat, 12 Jan 2013 19:35:47 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.72) (envelope-from ) id 1TuBYP-0006Ib-Po for bug-gnu-emacs@gnu.org; Sat, 12 Jan 2013 19:36:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 13 Jan 2013 00:36:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 13422 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 13422-submit@debbugs.gnu.org id=B13422.135803731924157 (code B ref 13422); Sun, 13 Jan 2013 00:36:01 +0000 Original-Received: (at 13422) by debbugs.gnu.org; 13 Jan 2013 00:35:19 +0000 Original-Received: from localhost ([127.0.0.1]:57402 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1TuBXi-0006HZ-BA for submit@debbugs.gnu.org; Sat, 12 Jan 2013 19:35:19 -0500 Original-Received: from ironport2-out.teksavvy.com ([206.248.154.182]:9232) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1TuBXf-0006HK-7K for 13422@debbugs.gnu.org; Sat, 12 Jan 2013 19:35:15 -0500 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AhoHAG6Zu09FpZpV/2dsb2JhbABEgXuuTYNJgQiCFQEBBAFWIwULCzQSFBgNiEAFugmNJoMeA4hCmnGBWIMH X-IronPort-AV: E=Sophos;i="4.75,637,1330923600"; d="scan'208";a="212393089" Original-Received: from 69-165-154-85.dsl.teksavvy.com (HELO fmsmemgm.homelinux.net) ([69.165.154.85]) by ironport2-out.teksavvy.com with ESMTP/TLS/ADH-AES256-SHA; 12 Jan 2013 19:34:54 -0500 Original-Received: by fmsmemgm.homelinux.net (Postfix, from userid 20848) id 6176BAE0B8; Sat, 12 Jan 2013 19:34:54 -0500 (EST) In-Reply-To: <87ip72jnbr.fsf@web.de> (Michael Heerdegen's message of "Sat, 12 Jan 2013 18:58:00 +0100") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 140.186.70.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:69691 Archived-At: > it has several advantages: Of course, it also has its down sides: - returns nil, so (if foo (discard bar) then) runs the `then' in the `else' branch. - only works at those syntactic places where an expression is expected (e.g. (let ((a 1) (discard exp1 exp2) (b 2)) blabla) doesn't work. In any case, I think the current comments are good enough, and save the programmer from having to choose which kind of comment to use. Stefan