GNU bug report logs - #41740
26.1; completion-at-point fails in the Pacal mode

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Shinichi Sakata <shinichi.sakata <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.1; completion-at-point fails in the Pacal mode
Date: Sat, 6 Jun 2020 10:46:37 -0700

[Message part 1 (text/plain, inline)]

 Use of C-M-i (completion-at-point) in the Pascal mode results in errors.

Here is a way to reproduce the problem:

   1. Start emacs by "emacs -Q".
   2. Open a new file with extension "pas" (say, test.pas).
   3. Type in: program test; var and then use C-M-i.

This should yields an error message like:

   completion--some: Args out of range: #("var" 0 3 (fontified t face
font-lock-type-face)), 0, -14
In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)
 of 2019-09-22, modified by Debian built on x86-grnet-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux 10 (buster)

Recent messages:
Auto-saving...
Mark set [2 times]
Saving file /home/ssakata/codesignal/pascal/test.pas...
Wrote /home/ssakata/codesignal/pascal/test.pas
pascal-completion: End of buffer [6 times]
completion--some: Args out of range: #("var" 0 3 (fontified t face
font-lock-type-face)), 0, -14
pascal-completion: End of buffer
No match [7 times]
completion--some: Args out of range: #("in" 0 2 (fontified t face
font-lock-keyword-face)), 0, -25
Quit

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --enable-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --build
 x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd
 --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/26.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/26.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --with-x=yes
 --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2
 -fdebug-prefix-map=/build/emacs-StqULU/emacs-26.1+1=.
-fstack-protector-strong
 -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 THREADS LIBSYSTEMD LCMS2

Important settings:
  value of $LANG: en_US.utf8
  value of $XMODIFIERS: @im=fcitx
  locale-coding-system: utf-8-unix

Major mode: Pascal

Minor modes in effect:
  diff-auto-refine-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-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
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
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format-spec rfc822 mml mml-sec password-cache epa derived epg epg-config
gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse
rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mail-utils vc-git diff-mode easymenu
easy-mmode pascal elec-pair time-date mule-util tooltip eldoc electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
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prog-mode register page menu-bar rfn-eshadow isearch timer select
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chinese composite charscript charprop case-table epa-hook jka-cmpr-hook
help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote dbusbind inotify lcms2 dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 100828 15914)
 (symbols 48 20975 1)
 (miscs 40 58 270)
 (strings 32 30377 1460)
 (string-bytes 1 794739)
 (vectors 16 15486)
 (vector-slots 8 506994 9878)
 (floats 8 53 384)
 (intervals 56 424 0)
 (buffers 992 14))

[Message part 2 (text/html, inline)]

Message #8 received at 41740 <at> debbugs.gnu.org (full text, mbox):

From: Dmitry Gutov <dgutov <at> yandex.ru>
To: Shinichi Sakata <shinichi.sakata <at> gmail.com>, 41740 <at> debbugs.gnu.org
Cc: esk <at> gnu.org
Subject: Re: bug#41740: 26.1; completion-at-point fails in the Pacal mode
Date: Sat, 6 Jun 2020 22:05:58 +0300

On 06.06.2020 20:46, Shinichi Sakata wrote:
> Use of C-M-i (completion-at-point) in the Pascal mode results in errors.
> 
> Here is a way to reproduce the problem:
> 
>     1. Start emacs by "emacs -Q".
>     2. Open a new file with extension "pas" (say, test.pas).
>     3. Type in: program test; var and then use C-M-i.
> 
> This should yields an error message like:
> 
>     completion--some: Args out of range: #("var" 0 3 (fontified t face 
> font-lock-type-face)), 0, -14
> In GNU Emacs 26.1 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)
>   of 2019-09-22, modified by Debian built on x86-grnet-01
> Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
> System Description: Debian GNU/Linux 10 (buster)

And I can confirm it on master.

Message #11 received at 41740 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattiase <at> acm.org>
To: Shinichi Sakata <shinichi.sakata <at> gmail.com>
Cc: 41740 <at> debbugs.gnu.org
Subject: bug#41740: 26.1; completion-at-point fails in the Pascal mode
Date: Sun, 21 Jun 2020 21:19:16 +0200

[Message part 1 (text/plain, inline)]

Thanks for the report! It looks like pascal-mode didn't obey the rules for completion functions: they mustn't move point.

Would you try these patches? The first should fix your bug, and the second deals with an apparent bug in C-M-a in pascal-mode found when fixing the first one.

[0001-Preserve-point-in-pascal-mode-completion-bug-41740.patch (application/octet-stream, attachment)]

[0002-Fix-spurious-error-in-beginning-of-defun-in-pascal-m.patch (application/octet-stream, attachment)]

[Message part 4 (text/plain, inline)]

Message #18 received at 41740-done <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattiase <at> acm.org>
To: Shinichi Sakata <shinichi.sakata <at> gmail.com>
Cc: 41740-done <at> debbugs.gnu.org
Subject: Re: bug#41740: 26.1; completion-at-point fails in the Pascal mode
Date: Mon, 22 Jun 2020 10:00:18 +0200

22 juni 2020 kl. 00.08 skrev Shinichi Sakata <shinichi.sakata <at> gmail.com>:
> 
> Thanks Mattias! Yes, the patches have fixed the problem. Thanks again for your help!

Good to hear -- pushed to master.

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