From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg Newsgroups: gmane.emacs.devel Subject: dynamic let closure not possible with `dlet', instead use lexical let and `setq' Date: Fri, 05 Jan 2024 06:04:41 +0100 Message-ID: <87plygbcba.fsf@dataswamp.org> 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="15229"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) To: emacs-devel@gnu.org Cancel-Lock: sha1:gLC4YEsXCvOQ5bY3yCQTGKqo6oQ= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Jan 05 07:39:15 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 1rLdrP-0003iV-9P for ged-emacs-devel@m.gmane-mx.org; Fri, 05 Jan 2024 07:39:15 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rLdqU-0006su-56; Fri, 05 Jan 2024 01:38:18 -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 1rLcO8-0006bi-2j for emacs-devel@gnu.org; Fri, 05 Jan 2024 00:04:56 -0500 Original-Received: from ciao.gmane.io ([116.202.254.214]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rLcO6-0007Lr-9y for emacs-devel@gnu.org; Fri, 05 Jan 2024 00:04:55 -0500 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1rLcO2-0002Jj-Ng for emacs-devel@gnu.org; Fri, 05 Jan 2024 06:04:50 +0100 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: emacs-devel@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=ged-emacs-devel@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=0.25, 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, 05 Jan 2024 01:38:17 -0500 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:314557 Archived-At: 1. You can't do a dynamic let closure with `dlet': (dlet ((oh-ah "oa")) (defun ohah () oh-ah) (declare-function ohah nil) ) ;; (ohah) ; Symbol’s value as variable is void: oh-ah 2. You can do a lexical let closure with `let', but after that you cannot make any of its lexical variables dynamic with `dlet': (let ((some-var 0)) (defun outer () (dlet ((some-var 1)) (inner) )) (declare-function outer nil) (defun inner () some-var) (declare-function inner nil) ) ;; (outer) ; 0 ;; (inner) ; 0 3. What you can do, is to keep the variable lexical and use it like a global variable with `setq': (let ((some-var 2)) (defun outer () (setq some-var 4) (prog1 (inner) (setq some-var 2) )) (declare-function outer nil) (defun inner () some-var) (declare-function inner nil) ) ;; (outer) ; 4 ;; (inner) ; 2 -- underground experts united https://dataswamp.org/~incal