Subject: bug#22562: 25.1.50; debug-on-error is always true

From: Lars Ingebrigtsen <[email-masked]>
Date: Fri, 05 Feb 2016 17:26:13 +1100

Starting with emacs -Q, if I eval

debug-on-error => t

However, C-h debug-on-error says

debug-on-error is a variable defined in ‘C source code’.
Its value is nil

I think this started happening today.

In GNU Emacs 25.1.50.9 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.7)
 of 2016-02-05 built on mouse
Repository revision: ebc6985b83ce2b1aefd761072d40ec3037bdd996
Windowing system distributor 'The X.Org Foundation', version 11.0.11702000
System Description:	Ubuntu 15.10

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

Important settings:
  value of $LC_MONETARY: nb_NO.UTF-8
  value of $LC_NUMERIC: nb_NO.UTF-8
  value of $LC_TIME: nb_NO.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

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

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Quit
Type C-x 1 to delete the help window.
Entering debugger...
Back to top level
t
Mark saved where search started [2 times]

Making completion list...

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message dired dired-loaddefs format-spec
rfc822 mml mml-sec epg epg-config gnus-util mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils character-fold
misearch multi-isearch vc vc-dispatcher vc-git diff-mode map seq
byte-opt gv bytecomp byte-compile cconv noutline outline easy-mmode
debug cl-extra help-fns help-mode easymenu cl-loaddefs pcase cl-lib
time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel x-win term/common-win x-dnd tool-bar dnd fontset
image regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow timer select scroll-bar
mouse jit-lock font-lock syntax facemenu font-core frame cl-generic cham
georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese charscript 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 dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty make-network-process emacs)

Memory information:
((conses 16 103830 3863)
 (symbols 48 21128 0)
 (miscs 40 186 263)
 (strings 32 27870 16584)
 (string-bytes 1 649918)
 (vectors 16 14562)
 (vector-slots 8 502146 4952)
 (floats 8 190 234)
 (intervals 56 316 11)
 (buffers 976 16)
 (heap 1024 47697 2144))

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no