Package: emacs;
Reported by: Ryan <rct <at> thompsonclan.org>
Date: Tue, 15 Oct 2013 00:42:02 UTC
Severity: wishlist
Found in version 24.3
Fixed in version 24.4
Done: Glenn Morris <rgm <at> gnu.org>
Bug is archived. No further changes may be made.
View this message in rfc822 format
From: help-debbugs <at> gnu.org (GNU bug Tracking System) To: Glenn Morris <rgm <at> gnu.org> Cc: tracker <at> debbugs.gnu.org Subject: bug#15616: closed (24.3; Setting lexical-binding in file's local variables block should trigger a warning) Date: Wed, 16 Oct 2013 01:37:02 +0000
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Your message dated Tue, 15 Oct 2013 21:36:28 -0400 with message-id <rniowy574z.fsf <at> fencepost.gnu.org> and subject line Re: bug#15616: 24.3; Setting lexical-binding in file's local variables block should trigger a warning has caused the debbugs.gnu.org bug report #15616, regarding 24.3; Setting lexical-binding in file's local variables block should trigger a warning to be marked as done. (If you believe you have received this mail in error, please contact help-debbugs <at> gnu.org.) -- 15616: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=15616 GNU Bug Tracking System Contact help-debbugs <at> gnu.org with problems
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From: Ryan <rct <at> thompsonclan.org> To: bug-gnu-emacs <at> gnu.org Subject: 24.3; Setting lexical-binding in file's local variables block should trigger a warning Date: Mon, 14 Oct 2013 17:40:42 -0700This bug report will be sent to the Bug-GNU-Emacs mailing list and the GNU bug tracker at debbugs.gnu.org. Please check that the From: line contains a valid email address. After a delay of up to one day, you should receive an acknowledgment at that address. Please write in English if possible, as the Emacs maintainers usually do not have translators for other languages. Please describe exactly what actions triggered the bug, and the precise symptoms of the bug. If you can, give a recipe starting from `emacs -Q': When compiling and/or loading an emacs lisp file that sets lexical-binding in a local variables section rather than in the first line of the file, a warning should be shown informing that the setting will have no effect. I don't think it is very well-known that lexical-binding as a file-local variable is special in this way. Just as an example, a recent change to the lexbind-mode emacs package moved it from the first line into a local variables block: https://github.com/spacebat/lexbind-mode/pull/3 https://github.com/purcell/lexbind-mode/commit/6a46c5a20f6ce1f3bc0032c7e5a44a37724c5462.diff Presumably, neither the submitter of that patch nor the author of lexbind-mode was aware of this restriction on lexical-binding, or else I doubt that patch would have been applied. Having a warning for a setting of lexical-binding that would have no effect would prevent such errors. -Ryan Thompson If Emacs crashed, and you have the Emacs process in the gdb debugger, please include the output from the following gdb commands: `bt full' and `xbacktrace'. For information about debugging Emacs, please read the file /Applications/Emacs.app/Contents/Resources/etc/DEBUG. In GNU Emacs 24.3.1 (x86_64-apple-darwin, NS apple-appkit-1038.36) of 2013-03-12 on bob.porkrind.org Windowing system distributor `Apple', version 10.3.1187 Configured using: `configure '--host=x86_64-apple-darwin' '--build=i686-apple-darwin' '--with-ns' 'build_alias=i686-apple-darwin' 'host_alias=x86_64-apple-darwin' 'CC=gcc -mmacosx-version-min=10.7 -isystem /Users/david/Xcode-10.7_4.5.2/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/usr/include/ -F/Users/david/Xcode-10.7_4.5.2/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks'' Important settings: locale-coding-system: nil default enable-multibyte-characters: t Major mode: Help Minor modes in effect: diff-auto-refine-mode: t recentf-mode: t global-pretty-mode: t sml-modeline-mode: t show-paren-mode: t savehist-mode: t minibuffer-electric-default-mode: t minibuffer-depth-indicate-mode: t ido-yes-or-no-mode: t ido-ubiquitous-mode: t icomplete-mode: t global-undo-tree-mode: t undo-tree-mode: t desktop-save-mode: t delete-selection-mode: t osx-pseudo-daemon-mode: t ido-everywhere: t shell-dirtrack-mode: t autopair-global-mode: t global-auto-complete-mode: t override-global-mode: t tooltip-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t buffer-read-only: t line-number-mode: t transient-mark-mode: t Recent input: <triple-wheel-down> <triple-wheel-down> <triple-wheel-down> <wheel-up> <double-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <wheel-up> <double-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <down-mouse-1> <mouse-1> <down-mouse-1> <mouse-1> <down-mouse-1> <mouse-1> M-c b r o w <backspace> <backspace> <backspace> <backspace> C-_ C-_ C-_ C-_ C-_ C-_ M-x b r o w <return> <return> <down-mouse-1> <mouse-1> M-x p a c k a g e - u p <backspace> <backspace> l i s <tab> <return> C-x b <return> <help-echo> <wheel-up> <double-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <down-mouse-1> <mouse-1> <down-mouse-1> <mouse-1> M-; <return> <left> - * - SPC l e x i c a l <wheel-down> <double-wheel-down> <wheel-up> <double-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <triple-wheel-up> <down-mouse-1> <mouse-1> - b i n d i n g : S-SPC t SPC - * - C-x C-s M-x n o r <return> C-h v l e x i <return> <down-mouse-1> <mouse-1> <down-mouse-1> <mouse-1> C-a C-k C-k C-x C-s C-x o C-h i <down-mouse-1> <mouse-movement> <mouse-movement> <drag-mouse-1> <down-mouse-1> <mouse-1> <down-mouse-1> <mouse-movement> <mouse-movement> <drag-mouse-1> <down-mouse-1> <mouse-movement> <mouse-movement> <drag-mouse-1> <down-mouse-1> <mouse-1> M-x C-y <return> l e x i <return> t <return> C-x o M-x <return> l e x <return> <up> <return> C-a C-x C-s M-x n o r m <return> C-h v l e x i <return> C-h v l e x i c a l - <return> <down-mouse-1> <mouse-1> <double-down-mouse-1> <double-mouse-1> <triple-down-mouse-1> <triple-mouse-1> <down-mouse-1> <mouse-1> <down-mouse-1> <mouse-1> <double-down-mouse-1> <double-mouse-1> <triple-down-mouse-1> <triple-mouse-1> <triple-down-mouse-1> <triple-mouse-1> <help-echo> <down-mouse-1> <mouse-movement> <mouse-movement> <drag-mouse-1> M-w M-x r e p o r t - e m a <return > Recent messages: Saving file /Users/ryan/.emacs.d/elpa/lexbind-mode-20130328.1131/lexbind-mode.el... Wrote /Users/ryan/.emacs.d/elpa/lexbind-mode-20130328.1131/lexbind-mode.el Type "q" in help window to restore its previous buffer. Saving file /Users/ryan/.emacs.d/elpa/lexbind-mode-20130328.1131/lexbind-mode.el... Wrote /Users/ryan/.emacs.d/elpa/lexbind-mode-20130328.1131/lexbind-mode.el modify-file-local-variable-prop-line: Buffer is read-only: #<buffer *info*> Saving file /Users/ryan/.emacs.d/elpa/lexbind-mode-20130328.1131/lexbind-mode.el... Wrote /Users/ryan/.emacs.d/elpa/lexbind-mode-20130328.1131/lexbind-mode.el Type "q" in help window to restore its previous buffer. 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[Message part 3 (message/rfc822, inline)]
From: Glenn Morris <rgm <at> gnu.org> To: 15616-done <at> debbugs.gnu.org Subject: Re: bug#15616: 24.3; Setting lexical-binding in file's local variables block should trigger a warning Date: Tue, 15 Oct 2013 21:36:28 -0400Version: 24.4 Ryan wrote: > I don't think it is very well-known that lexical-binding as a > file-local variable is special in this way. Well, it's in the NEWS entry that introduces lexical-binding, in the variable's doc, and in the elisp manual. > Having a warning for a setting of lexical-binding that would have no > effect would prevent such errors. Implemented on the first loading of a file with lexical-binding at the end.
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