From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.ciao.gmane.io!not-for-mail From: Helmut Eller Newsgroups: gmane.emacs.devel Subject: Re: let-alias Date: Wed, 06 May 2020 23:27:40 +0200 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="ciao.gmane.io:159.69.161.202"; logging-data="104634"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: Emacs developers To: Philipp Stephani Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed May 06 23:28:33 2020 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 1jWRai-000R7M-BW for ged-emacs-devel@m.gmane-mx.org; Wed, 06 May 2020 23:28:32 +0200 Original-Received: from localhost ([::1]:46426 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jWRah-0002On-Dq for ged-emacs-devel@m.gmane-mx.org; Wed, 06 May 2020 17:28:31 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:48540) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jWRZy-0001vw-71 for emacs-devel@gnu.org; Wed, 06 May 2020 17:27:46 -0400 Original-Received: from mail-lj1-x22e.google.com ([2a00:1450:4864:20::22e]:43954) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jWRZx-0002cA-Bv for emacs-devel@gnu.org; Wed, 06 May 2020 17:27:45 -0400 Original-Received: by mail-lj1-x22e.google.com with SMTP id l19so3985585lje.10 for ; Wed, 06 May 2020 14:27:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version; bh=OXdJoDfmw7L/wKH6pP8UVvhoRT8TdTwlLZduzlNTY6E=; b=H8weTypI6L9xGulqjLpVDmV1aRzqTzz1qy3CZtZjBj1gsLYixoCeNhZ+j66IeoeoUG XrxX7poptJd9WLHvBSaVjmqTseIbgpDAldZTjPg+EWiNDXmqXG6sAwPz6kOQ+GgvEBiV EYzB/0lqJZhLwQ3jUJJUjjdl6hy00aCTf9AUddAbrvfDG0RZPzhn02zunC5sHWrl1xkb iCUjHZew0rlY+G98c4ecpG+5Nid55W5BhMPuPXfuhh+U1cKmMlHujM3fhjNO4xN3T8bK C/NUkGTUMxV7f76V9sBDXMaa+I6x3DZrnTfcdnnUlH5+mVc+qPqTDnXemd+26uq+dGsi wt7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:references:date:in-reply-to :message-id:user-agent:mime-version; bh=OXdJoDfmw7L/wKH6pP8UVvhoRT8TdTwlLZduzlNTY6E=; b=cW4gI5laDzRowBefnKBqVTo3+jSHQ3ZJskXacEYTtM9LiZ77zF78wdbRXkkNlr0zdA XsDBWf6hpmE8C1kuJ1/Vvy/BUvZ3wk8PMdkO++1249rqz/o5Xhn7UYE4iIsPVxkze+yy qdSnKKvPgyTlz9Z+o3MF6ym5dsJc0AI+WEP09E6aaIUIc9BSg82+aGGQrXilkm0pF7Rg 4BwcPCJ1fHEYQ4YCf8ZW6z/gAw+lNXXoDniorkloVqmSE2YcG7Z0iRoKMEdjq4B9PunV 7W7UyziDsvT0RZBH++TlLGPf2FzUS2F3T0vBcQmQGuK5AJyfRsKhhvMrgAdkpkZ/nv3Y zj4Q== X-Gm-Message-State: AGi0PuatVEYZ86pvnYf4QFfkOCs4qutvGpdaBWduQ9v0jUVW/djxeDLo VC6dXZoKKl6JguNWZb3ZOMQ2mLd9 X-Google-Smtp-Source: APiQypK/ews8AtgF+/R8FmttsX3aGrjMk/bgD+ISDA0xJA1Y2GR6yryjWu1FSnesjOvuLztlx1kLXw== X-Received: by 2002:a2e:8296:: with SMTP id y22mr6555965ljg.254.1588800462731; Wed, 06 May 2020 14:27:42 -0700 (PDT) Original-Received: from caladan (dialin-237144.rol.raiffeisen.net. [195.254.237.144]) by smtp.gmail.com with ESMTPSA id g1sm2354921lfb.85.2020.05.06.14.27.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 06 May 2020 14:27:41 -0700 (PDT) In-Reply-To: (Philipp Stephani's message of "Wed, 6 May 2020 22:31:57 +0200") Received-SPF: pass client-ip=2a00:1450:4864:20::22e; envelope-from=eller.helmut@gmail.com; helo=mail-lj1-x22e.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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" Xref: news.gmane.io gmane.emacs.devel:249125 Archived-At: On Wed, May 06 2020, Philipp Stephani wrote: >> Inside BODY, wherever NEW-NAME is used as function name it should >> produce the same result as using OLD-NAME would. E.g. >> >> (let-alias ((c car)) (c x)) === (car x) >> (let-alias ((c car)) #'c) === #'car >> (let-alias ((c car)) (setf (c x) y)) === (setf (car x) y) >> (let-alias ((when-not unless)) (when-not x y)) === (unless x y) >> >> Would somebody be opposed to such a new special form? Or better yet, is >> there already some way to achieve this? > > > If you don't mind the quoting, you can use (cl-flet ((c #'car)) ...) Hmm, didn't even know that cl-flet had this feature. But the bytecode for (defun foo (x) (cl-flet ((c #'car)) (c x))) is byte code for foo: doc: ... args: (arg1) 0 constant car 1 dup 2 stack-ref 2 3 call 1 4 return while the bytecdoe for (defun bar (x) (car x)) is byte code for bar: doc: ... args: (arg1) 0 dup 1 car 2 return So it's obviously not doing what one would expect from an (zero cost) alias. cl-flet also doesn't seem to work for the (setf (c x) ...) example. Helmut