From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Michael Heerdegen Newsgroups: gmane.emacs.bugs Subject: bug#49163: 28.0.50; Dynbind add-function and lambdas as file vars Date: Tue, 22 Jun 2021 01:16:50 +0200 Message-ID: <87mtrivme5.fsf@web.de> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="34500"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Stefan Monnier To: 49163@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Jun 22 01:18:12 2021 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 1lvTBD-0008mY-S1 for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 22 Jun 2021 01:18:11 +0200 Original-Received: from localhost ([::1]:54382 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lvTBC-0008Tf-N2 for geb-bug-gnu-emacs@m.gmane-mx.org; 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envelope-from=michael_heerdegen@web.de; helo=mout.web.de X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 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_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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" Xref: news.gmane.io gmane.emacs.bugs:208834 Archived-At: Hello, this is the second time I have stumbled across this and it is annoying - so here is the story: The template of the code I was using is like this: #+begin_src emacs-lisp ;; -*- lexical-binding: t -*- (defun test () (interactive) (funcall (or my-do-with-test-process-fun #'identity) (start-process "test-process" "foo" "xterm"))) (defvar my-do-with-test-process-fun nil) #+end_src I want to use `my-do-with-test-process-fun' as a file local variable. I try like this: testfile.txt: | File contents ... | ... | | Local Variables: | my-do-with-test-process-fun: (lambda (p) (add-function :before (process-= sentinel p) (lambda (&rest _) (message "Test")))) | End: (I hope mailing stuff doesn't break the overlong line defining `my-do-with-test-process-fun'.) When I open that file and try M-x test I get this error: | Debugger entered--Lisp error: (void-variable #:v) | (process-sentinel #:v) | (lambda nil (process-sentinel #:v))() | advice--add-function(:before ((lambda nil (process-sentinel #:v)) lamb= da (gv--val) (set-process-sentinel #:v gv--val)) (lambda (&rest _) (messag= e "Test")) nil) | (add-function :before (process-sentinel p) (lambda (&rest _) (message = "Test"))) | (lambda (p) (add-function :before (process-sentinel p) (lambda (&rest = _) (message "Test"))))(#) | funcall((lambda (p) (add-function :before (process-sentinel p) (lambda= (&rest _) (message "Test")))) #) | test() (1) I suspect that this happens because the lack of lexical binding "somewhere". Enabling lexical binding mode in `testfile.txt' alone doesn't help. OTOH, setting the file local variable like this: | Local Variables: | eval: (setq-local my-do-with-test-process-fun (eval (lambda (p) (add-fun= ction ...) t))) | End: makes `M-x test` work. Is this all expected so far? (2) If lack of lexical binding is the culprit: I see that `add-function' uses `gv-ref' and that warns about uses in dynamically binding Elisp. Should `add-function' warn about such a restriction as well? (3) And I wonder: now that lexical binding Elisp gets more common, should file local variables be set using a lexically binding environment =2D- or at least when the file itself specifies lexical binding mode? TIA, Michael. In GNU Emacs 28.0.50 (build 15, x86_64-pc-linux-gnu, GTK+ Version 3.24.24,= cairo version 1.16.0) of 2021-06-21 built on drachen Repository revision: 50a59b9af1517f24fca60feab37140f2b35ea5ac Repository branch: master Windowing system distributor 'The X.Org Foundation', version 11.0.12010000 System Description: Debian GNU/Linux bullseye/sid Configured features: CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON LCMS2 LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM GTK3 ZLIB Important settings: value of $LC_ALL: de_DE.utf8 value of $LC_COLLATE: C value of $LC_TIME: C value of $LANG: de_DE.utf8 locale-coding-system: utf-8-unix