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 00:58:49 +0100 Message-ID: <87sfrorqh2.fsf@zoho.eu> References: Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="29566"; 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:mT/P7hkIx66apUfozHHxH6UEpHk= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Sat Mar 12 01:32:44 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 1nSpga-0007Vn-9P for geh-help-gnu-emacs@m.gmane-mx.org; Sat, 12 Mar 2022 01:32:44 +0100 Original-Received: from localhost ([::1]:50384 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nSpgY-0000QE-SD for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 11 Mar 2022 19:32:42 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:48316) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nSp9x-0005LR-0B for help-gnu-emacs@gnu.org; Fri, 11 Mar 2022 18:59:01 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]:41772) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nSp9v-0002k8-GL for help-gnu-emacs@gnu.org; Fri, 11 Mar 2022 18:59:00 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1nSp9s-0008l5-Rp for help-gnu-emacs@gnu.org; Sat, 12 Mar 2022 00:58:56 +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 19:30:58 -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:136465 Archived-At: Steinar Bang wrote: > But it still didn't work. And the reason it didn't work is > that filename didn't have a value set. > > If I replace the filename variable with a text constant[6], > then the function works. > > But as far as I can tell, the function in uses variables > defined in the wrapping (let) in the lambda...? Dynamic/special scope? But I see that you don't have that ... weird. This works: ;;; -*- lexical-binding: t -*- ;; ;; this file: ;; https://dataswamp.org/~incal/emacs-init/geh.el (defun add-one-f (term) (let ((tm term)) (lambda () (1+ tm)) )) (funcall (add-one-f 2)) ; 3 But not this: ;; this file: ;; https://dataswamp.org/~incal/emacs-init/geh-dynamic.el (defun add-two-f (term) (let ((tm term)) (lambda () (+ 2 tm)) )) (funcall (add-two-f 2)) ; Symbol’s value as variable is void: tm -- underground experts united https://dataswamp.org/~incal