From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#66816: [PATCH] Delete redundant lambdas around unary functions Date: Sun, 29 Oct 2023 17:55:27 -0400 Message-ID: References: <1F4EC90D-4A07-4B24-B699-5AC1CC6A8408@gmail.com> Reply-To: Stefan Monnier Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="34315"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: Stefan Kangas , 66816@debbugs.gnu.org To: Mattias =?UTF-8?Q?Engdeg=C3=A5rd?= Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Oct 29 22:56:51 2023 Return-path: Envelope-to: geb-bug-gnu-emacs@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 1qxDm6-0008mC-7E for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 29 Oct 2023 22:56:50 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qxDm1-0001Yv-9v; Sun, 29 Oct 2023 17:56:45 -0400 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 1qxDlt-0001WD-Gy for bug-gnu-emacs@gnu.org; Sun, 29 Oct 2023 17:56:40 -0400 Original-Received: from debbugs.gnu.org ([2001:470:142:5::43]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1qxDll-00062Z-7J for bug-gnu-emacs@gnu.org; Sun, 29 Oct 2023 17:56:32 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1qxDmH-00050k-MO for bug-gnu-emacs@gnu.org; Sun, 29 Oct 2023 17:57:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Stefan Monnier Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 29 Oct 2023 21:57:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 66816 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: patch Original-Received: via spool by 66816-submit@debbugs.gnu.org id=B66816.169861657019194 (code B ref 66816); Sun, 29 Oct 2023 21:57:01 +0000 Original-Received: (at 66816) by debbugs.gnu.org; 29 Oct 2023 21:56:10 +0000 Original-Received: from localhost ([127.0.0.1]:43655 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1qxDlR-0004zU-NZ for submit@debbugs.gnu.org; Sun, 29 Oct 2023 17:56:09 -0400 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:43604) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1qxDlQ-0004zH-T1 for 66816@debbugs.gnu.org; Sun, 29 Oct 2023 17:56:09 -0400 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 95BA0441362; Sun, 29 Oct 2023 17:55:30 -0400 (EDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1698616528; bh=Ov11spuvSkYEVydS4GtOG3c7jyUbTA/bW23km9ehwM0=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=dS0Sd6hdlSijx2rqjNBudEav9V8C0NtnQ6PuRtPiBdzF10ThfZ0+DxStVX3SVGEdc 8MTDqFASwhE69A5USpn36ghhnnUKFceyXOnY1GxWlzsaJmo3Kr1vkMgzpe/QgojgOE AdneZuCP/DN0FzPmWCeepFeTKFc5pgkrxuVkK3eBFKsHqJJtbQNQ4MU9yWYM2IBiZB Kip2wHKKiBKYsyHwqsdmAPdQrLeRJWBj9aA64zL+vVF+PoqSifaMCz275KPitRmeUa HFx9enTbCx+Q0loCTGd1Rw/59szXvdbmoMviMOzsqg+raaM8XmBM8T4AG3TJmNKoHG J4xCpAsGcA01w== Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id BAD0D441319; Sun, 29 Oct 2023 17:55:28 -0400 (EDT) Original-Received: from pastel (unknown [45.72.195.71]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 9018A12023D; Sun, 29 Oct 2023 17:55:28 -0400 (EDT) In-Reply-To: <1F4EC90D-4A07-4B24-B699-5AC1CC6A8408@gmail.com> ("Mattias =?UTF-8?Q?Engdeg=C3=A5rd?="'s message of "Sun, 29 Oct 2023 20:03:16 +0100") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list 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-mx.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:273530 Archived-At: The patch looks good to me. > We could also have the compiler =CE=B7-reduce automatically. I investigat= ed this > very briefly some time ago. Maybe I can dig up the patch. > One problem is that the arity isn't necessarily preserved. And even if we check the arity before performing the rewrite, the arity at compile-time may be different from the arity at run-time, so it's not a safe optimization. OTOH we could emit a warning :-) > Most of the time this isn't a problem but it could be something to > watch out for if doing the =CE=B7-reduction by hand. I've been bitten a few times, indeed. Stefan