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.
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bug-gnu-emacs <at> gnu.org
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; Package emacs
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(Tue, 15 Oct 2013 00:42:03 GMT) Full text and rfc822 format available.Ryan <rct <at> thompsonclan.org>
:bug-gnu-emacs <at> gnu.org
.
(Tue, 15 Oct 2013 00:42:04 GMT) Full text and rfc822 format available.Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
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 -0700
This 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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/Users/ryan/.emacs.d/elpa/org-20130527/ob-calc hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-calc /Users/ryan/.emacs.d/elpa/org-20130527/ob-C hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-C /Users/ryan/.emacs.d/elpa/org-20130527/ob-awk hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-awk /Users/ryan/.emacs.d/elpa/org-20130527/ob-asymptote hides /Applications/Emacs.app/Contents/Resources/lisp/org/ob-asymptote ~/.emacs.d/el-get/el-get/.dir-locals hides /Applications/Emacs.app/Contents/Resources/lisp/gnus/.dir-locals /Users/ryan/.emacs.d/elpa/emms-20130515.1144/tq hides /Applications/Emacs.app/Contents/Resources/lisp/emacs-lisp/tq Features: (shadow sort mail-extr files-x lexbind-mode etags gitignore-mode conf-mode goto-addr wdired ls-lisp find-dired dired-x two-column iso-transl el-get-lock finder skeleton autoinsert lisp-mnt mule-util parse-time network-stream starttls url-http tls url-gw url-cache url-auth async tabify man cperl-mode perl-mode 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bug-gnu-emacs <at> gnu.org
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(Tue, 15 Oct 2013 03:23:02 GMT) Full text and rfc822 format available.Message #8 received at 15616 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> iro.umontreal.ca> To: Ryan <rct <at> thompsonclan.org> Cc: 15616 <at> debbugs.gnu.org Subject: Re: bug#15616: 24.3; Setting lexical-binding in file's local variables block should trigger a warning Date: Mon, 14 Oct 2013 23:22:32 -0400
> 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. Agreed, patch welcome, Stefan
bug-gnu-emacs <at> gnu.org
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(Tue, 15 Oct 2013 17:19:01 GMT) Full text and rfc822 format available.Message #11 received at 15616 <at> debbugs.gnu.org (full text, mbox):
From: Ryan <rct <at> thompsonclan.org> To: Stefan Monnier <monnier <at> iro.umontreal.ca> Cc: 15616 <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 10:17:51 -0700
Actually, my testing indicates that the documentation is inaccurate: lexical-binding can be set via either the first line or a local variables block, and it will take effect in both cases when the file is compiled. This is on version 24.3.1. So I guess the documentation just needs to be updated. On Mon Oct 14 20:22:32 2013, Stefan Monnier wrote: >> 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. > > Agreed, patch welcome, > > > Stefan
Glenn Morris <rgm <at> gnu.org>
:Ryan <rct <at> thompsonclan.org>
:Message #16 received at 15616-done <at> debbugs.gnu.org (full text, mbox):
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 -0400
Version: 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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(Wed, 16 Oct 2013 03:05:02 GMT) Full text and rfc822 format available.Message #19 received at 15616 <at> debbugs.gnu.org (full text, mbox):
From: Stefan Monnier <monnier <at> IRO.UMontreal.CA> To: Ryan <rct <at> thompsonclan.org> Cc: 15616 <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 23:04:33 -0400
> Actually, my testing indicates that the documentation is inaccurate: > lexical-binding can be set via either the first line or a local variables > block, and it will take effect in both cases when the file is compiled. This > is on version 24.3.1. So I guess the documentation just needs to be updated. No. The doc is right. It sometimes work, but not always (more specifically, it doesn't work if loaded uncompiled, IIRC). Stefan
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(Wed, 13 Nov 2013 12:24:04 GMT) Full text and rfc822 format available.
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