From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Dan Nicolaescu Newsgroups: gmane.emacs.devel Subject: Re: t and nil in pure memory? Date: Thu, 19 Nov 2009 13:05:43 -0800 (PST) Message-ID: <200911192105.nAJL5hR5002252@godzilla.ics.uci.edu> References: <200911112023.nABKNrH6023933@godzilla.ics.uci.edu> <87pr7oxieq.fsf@freebits.de> <200911130524.nAD5O5uu009102@godzilla.ics.uci.edu> <87my2nsfh3.fsf@lola.goethe.zz> <877htqswq0.fsf@lola.goethe.zz> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1258665065 2371 80.91.229.12 (19 Nov 2009 21:11:05 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 19 Nov 2009 21:11:05 +0000 (UTC) Cc: dak@gnu.org, Stefan Monnier , emacs-devel@gnu.org To: rms@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Thu Nov 19 22:10:58 2009 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1NBEHJ-0004tL-FJ for ged-emacs-devel@m.gmane.org; Thu, 19 Nov 2009 22:10:57 +0100 Original-Received: from localhost ([127.0.0.1]:54800 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NBEHI-00055m-PR for ged-emacs-devel@m.gmane.org; Thu, 19 Nov 2009 16:10:56 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1NBEGv-0004va-Eu for emacs-devel@gnu.org; Thu, 19 Nov 2009 16:10:33 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1NBEGq-0004sG-Ii for emacs-devel@gnu.org; Thu, 19 Nov 2009 16:10:32 -0500 Original-Received: from [199.232.76.173] (port=60375 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NBEGq-0004s6-Bq for emacs-devel@gnu.org; Thu, 19 Nov 2009 16:10:28 -0500 Original-Received: from paul-mcgann-v0.ics.uci.edu ([128.195.1.147]:51617) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1NBEGj-0002F7-DJ; Thu, 19 Nov 2009 16:10:21 -0500 Original-Received: from godzilla.ics.uci.edu (godzilla.ics.uci.edu [128.195.10.101]) by paul-mcgann-v0.ics.uci.edu (8.13.8/8.13.8) with ESMTP id nAJL5hif029072 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 19 Nov 2009 13:05:43 -0800 Original-Received: (from dann@localhost) by godzilla.ics.uci.edu (8.13.8+Sun/8.13.6/Submit) id nAJL5hR5002252; Thu, 19 Nov 2009 13:05:43 -0800 (PST) In-Reply-To: (Richard Stallman's message of "Thu, 19 Nov 2009 11:23:27 -0500") Original-Lines: 18 X-ICS-MailScanner-Information: Please send mail to helpdesk@ics.uci.edu or more information X-ICS-MailScanner-ID: nAJL5hif029072 X-ICS-MailScanner: Found to be clean X-ICS-MailScanner-SpamCheck: not spam, SpamAssassin (not cached, score=-1.44, required 5, autolearn=disabled, ALL_TRUSTED -1.44) X-ICS-MailScanner-From: dann@godzilla.ics.uci.edu X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6 (newer, 3) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:117299 Archived-At: Richard Stallman writes: > There are *many* ways for the user to shoot herself in the foot and make > her Emacs session completely unusable. > > We won't try all, but it is useful to catch some. unintern is not > used a lot, so don't worry about the cpu time. Please don't do it, it does not help ANYTHING. This is just one minor way people can shoot themselves in a foot, but compared to what you can do with, say, "fset" it's just a joke. The original proposal was to make t and nil constant, with the thought that this will provide some roadmap for being able to make a lot of symbols constant, and that would have a real life speed benefit for speeding up GC. But not being able to unintern t and nil is not useful to anyone.