From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: How do I pass a variable defined in a wrapping let, to a lambda? Date: Sat, 12 Mar 2022 03:18:52 +0100 Message-ID: <87r177rjzn.fsf@zoho.eu> References: <87k0d03vaw.fsf@ericabrahamsen.net> <8735joc5of.fsf@web.de> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="8628"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:RBpXYRjAl+YoBLCHo4xiqpOwvns= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat Mar 12 03:40:55 2022 Return-path: Envelope-to: geh-help-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 1nSrgd-00024X-9b for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 12 Mar 2022 03:40:55 +0100 Original-Received: from localhost ([::1]:37966 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nSrgb-0002Qx-HY for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 11 Mar 2022 21:40:53 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:46292) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nSrLT-0000TK-Jy for help-gnu-emacs@gnu.org; Fri, 11 Mar 2022 21:19:03 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:47970) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nSrLS-00073a-1S for help-gnu-emacs@gnu.org; Fri, 11 Mar 2022 21:19:03 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1nSrLQ-0007UH-3r for help-gnu-emacs@gnu.org; Sat, 12 Mar 2022 03:19:00 +0100 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Fri, 11 Mar 2022 21:40:25 -0500 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:136474 Archived-At: Michael Heerdegen wrote: > you may want to find out what evaluating lexical-binding in > the buffer with lexical-binding -> nil gives you. > > Second: (AFAIK...) be sure to reeval `steinars-test' with > lexical-binding -> nil. `steinars-test' defined using the > lexical binding dialect will return a closure even when > called in the dynamcially binding dialect. This is an example of why I think there should be three `let': * "let" that is static/lexical except for already-defined dynamic/special variables (i.e., what `let' is already under static/lexical scope, so won't break any code to change. well, there wouldn't be any change except static/lexical would be default everywhere) * "dlet" that is always dynamic/special * "slet" that is always static/lexical Then we could get rid of the ugly and impractical cookie: ;;; -*- lexical-binding: t -*- The insistence on "dlet" would break code for people w/o the cookie who expects `let' do be dynamic/special, however it is only good they are forced to be explicit with that and besides it is only one `replace-regexp' away anyway ... all the way! -- underground experts united https://dataswamp.org/~incal