From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Distinguishing `consp` and `functionp` Date: Tue, 30 Jan 2024 22:37:32 -0500 Message-ID: References: <86msssble8.fsf@gnu.org> <86bk9448ai.fsf@gnu.org> <864jew40m3.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="34174"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: emacs-devel@gnu.org To: =?windows-1252?B?Sm/jbyBU4XZvcmE=?= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Jan 31 04:38:07 2024 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1rV1QM-0008gm-Lq for ged-emacs-devel@m.gmane-mx.org; Wed, 31 Jan 2024 04:38:06 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rV1Q5-00022J-Jp; Tue, 30 Jan 2024 22:37:49 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rV1Q2-000222-Jm for emacs-devel@gnu.org; Tue, 30 Jan 2024 22:37:47 -0500 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rV1Q0-0004di-TI for emacs-devel@gnu.org; Tue, 30 Jan 2024 22:37:46 -0500 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 65C2B442A88; Tue, 30 Jan 2024 22:37:43 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1706672258; bh=1Fag9K1wjm1ki+bI3OnyBmqtxR4cx1svBYIq94LTlGM=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=gBsyNVLnEJM2LUUBCuc0r08TgTIC7PUqveavDFW5UTrSD5p/MDQBq9hVAoZi4BltD fwfoHIJfd1ieB2W6Eh6OeB4exGw4qapwWDuoo1CCVkp5+tJvb9078+tnh0vkNWMCKY +8l0NorI/nkbCYD4zY11N2GXUJrYeGYQPWkgcjINna8CH4kPMfIw2VP6edCn9o9ymt 965isukJF9ACG15SKsiwWqE5Uso46tQo5KnK1852GoM7WPdt9L5py/r31/TBE9gtGD 6Im5ZvZCJZozG7hTdJJXJlP0kCsS7cQgj9PIs4HXJ002Jssy652hVJ7zw2Gj2S3q0e ZcLcLnq5S0e6A== Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 0574B442A7F; Tue, 30 Jan 2024 22:37:38 -0500 (EST) Original-Received: from alfajor (104-222-119-131.cpe.teksavvy.com [104.222.119.131]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id D2E6112032C; Tue, 30 Jan 2024 22:37:37 -0500 (EST) In-Reply-To: (=?windows-1252?Q?=22Jo=E3o_T=E1vora=22's?= message of "Wed, 31 Jan 2024 00:40:41 +0000") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 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-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:315654 Archived-At: >> > Dunno. SBCL's compiler is pretty good, it propagates types and warns >> > say, when using generic+ instead of must faster fixum+. >> Knowing "this is a function" isn't terribly better than "this is >> either a function or a cons cell starting with `lambda`": it will rarely >> let you turn a generic+ into a fixnum+. > Isn't knowing "this is a function" a prerequisite for proving e.g. > "this is a function returning a fixnum"? Maybe it's a prerequisite, but it's pretty damn far from sufficient: if you're in a position to know that it returns a fixnum, then you most likely won't need `funcall` to tell you that it's a function. There are much lower hanging fruits. Stefan