GNU bug report logs - #24542
25.1.50; The symbol `@' and sexp scanning

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#24542: closed (25.1.50; The symbol `@' and sexp scanning)
Date: Fri, 12 Apr 2024 17:30:04 +0000

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Your message dated Fri, 12 Apr 2024 13:29:16 -0400
with message-id <jwv1q7a32y1.fsf-monnier+emacs <at> gnu.org>
and subject line Re: bug#24542: 25.1.50; The symbol `@' and sexp scanning
has caused the debbugs.gnu.org bug report #24542,
regarding 25.1.50; The symbol `@' and sexp scanning
to be marked as done.

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From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.1.50; The symbol `@' and sexp scanning
Date: Sun, 25 Sep 2016 19:42:17 +0200

Hi,

the following breaks my "el-search" package when searching in
"skeleton.el".  It assumes that calling `scan-sexps' works at the start
of any sexp.

Recipe: in emacs -Q,

insert

    (eq element '@)

in an elisp mode buffer (e.g. scratch).  Put point at the quote or the
"@".  Eval

    (goto-char (scan-sexps (point) 1))

and you get an error like:


Debugger entered--Lisp error: (scan-error "Containing expression ends prematurely" 15 16)
  scan-sexps(13 1)
  (goto-char (scan-sexps (point) 1))
  eval((goto-char (scan-sexps (point) 1)) nil)
  eval-expression((goto-char (scan-sexps (point) 1)) nil)
  funcall-interactively(eval-expression (goto-char (scan-sexps (point) 1)) nil)
  call-interactively(eval-expression nil nil)
  command-execute(eval-expression)


I think `scan-sexps' should not error.  FWIW, if I add one more sexp to
the list after "'@" (different from "'@"), there is no error.


TIA,

Michael.




In GNU Emacs 25.1.50.2 (x86_64-pc-linux-gnu, GTK+ Version 3.21.5)
 of 2016-09-23 built on drachen
Repository revision: 14c36d76df035faa127580d706a0564f4e496991
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:	Debian GNU/Linux testing (stretch)

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY
LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11

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

Major mode: Emacs-Lisp

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 24542-done <at> debbugs.gnu.org
Subject: Re: bug#24542: 25.1.50; The symbol `@' and sexp scanning
Date: Fri, 12 Apr 2024 13:29:16 -0400

>>  (defvar emacs-lisp-mode-syntax-table
>>    (let ((table (make-syntax-table lisp-data-mode-syntax-table)))
>> -    ;; These are redundant, now.
>> -    ;;(modify-syntax-entry ?\[ "(]  " table)
>> -    ;;(modify-syntax-entry ?\] ")[  " table)
>> +    ;; `syntax-propertize'. takes care of `,@'.
>> +    (modify-syntax-entry ?@ "_" table)
>>      table)
>>    "Syntax table used in `emacs-lisp-mode'.")
>
> This seems to give good results for me - so far at least.

Thanks, pushed to `master`, closing.


        Stefan

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