GNU bug report logs - #49599
REPORT error BAD CONS CELL

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

From: <david <at> ngdr.net>
To: <bug-gnu-emacs <at> gnu.org>
Subject: REPORT error BAD CONS CELL
Date: Fri, 16 Jul 2021 17:15:33 -0600

Hello people,

Apparently the global-map has a couple of bad cons cells in it.  I got the
following message when I was processing the map.  After that are a few
entries
from the map itself.

REPORT error BAD CONS CELL (menu-item tab bar ignore :filter
tab-bar-make-keymap)
(please work out how you did it if you can) press any key to continue.

..
(mouse-4 . mwheel-scroll)
(XF86WakeUp . ignore)
(tool-bar menu-item tool bar ignore :filter tool-bar-make-keymap)
(tab-bar menu-item tab bar ignore :filter tab-bar-make-keymap)
(C-f10 . buffer-menu-open)
(f10 . menu-bar-open)
..



In GNU Emacs 27.1 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2021-07-12 built on Erota
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description: Linux Mint 18.3

Recent messages:
Mark set [2 times]
Fill column set to 82 (was 100)
Auto-saving...done
Mark set
Saving file /home/dajo/tmp/TRASH-collect...
Wrote /home/dajo/tmp/TRASH-collect
executing  lambda function  ... [2 times]
Mark set [2 times]
Mark saved where search started [2 times]
Mark set

Configured using:
 'configure --with-mailutils'

Configured features:
XPM JPEG TIFF GIF PNG SOUND DBUS GSETTINGS GLIB NOTIFY INOTIFY GNUTLS
FREETYPE HARFBUZZ XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES
THREADS PDUMPER GMP

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Info

Minor modes in effect:
  display-time-mode: t
  show-paren-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
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  electric-indent-mode: t
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  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
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  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
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thingatpt url-queue url url-proxy url-privacy url-expand url-methods
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url-util url-parse auth-source cl-seq eieio eieio-core cl-macs
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Memory information:
((conses 16 464155 220690)
 (symbols 48 19571 1)
 (strings 32 68133 20124)
 (string-bytes 1 3239681)
 (vectors 16 26029)
 (vector-slots 8 392092 182960)
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 (intervals 56 35111 1852)
 (buffers 1000 123)
 (heap 1024 309277 190816))

-- 
David Outteridge
303 794 9278

Message #8 received at 49599 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: <david <at> ngdr.net>
Cc: 49599 <at> debbugs.gnu.org
Subject: Re: bug#49599: REPORT error BAD CONS CELL
Date: Sat, 17 Jul 2021 09:23:50 +0300

> Date: Fri, 16 Jul 2021 17:15:33 -0600
> From: <david <at> ngdr.net>
> 
> Apparently the global-map has a couple of bad cons cells in it.  I got the
> following message when I was processing the map.  After that are a few
> entries
> from the map itself.
> 
> REPORT error BAD CONS CELL (menu-item tab bar ignore :filter
> tab-bar-make-keymap)
> (please work out how you did it if you can) press any key to continue.
> 
> ..
> (mouse-4 . mwheel-scroll)
> (XF86WakeUp . ignore)
> (tool-bar menu-item tool bar ignore :filter tool-bar-make-keymap)
> (tab-bar menu-item tab bar ignore :filter tab-bar-make-keymap)
> (C-f10 . buffer-menu-open)
> (f10 . menu-bar-open)
> ..

Please show the code which triggers this message.

Thanks.

Message #11 received at 49599 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: <david <at> ngdr.net>
Cc: 49599 <at> debbugs.gnu.org
Subject: Re: bug#49599: REPORT error BAD CONS CELL
Date: Sat, 17 Jul 2021 16:13:32 +0200

<david <at> ngdr.net> writes:

> Apparently the global-map has a couple of bad cons cells in it.  I got the
> following message when I was processing the map.  After that are a few
> entries
> from the map itself.
>
> REPORT error BAD CONS CELL (menu-item tab bar ignore :filter
> tab-bar-make-keymap)
> (please work out how you did it if you can) press any key to continue.

I can't find the string "BAD CONS CELL" in the Emacs tree, but I may be
grepping for the wrong thing.  Or perhaps the message is from a
third-party package?

Do you have a recipe, starting from "emacs -Q", for how to reproduce
this problem?

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

Message #16 received at 49599 <at> debbugs.gnu.org (full text, mbox):

From: <david <at> ngdr.net>
To: Eli Zaretskii <eliz <at> gnu.org>, <larsi <at> gnus.org>
Cc: 49599 <at> debbugs.gnu.org
Subject: Re: bug#49599: REPORT error BAD CONS CELL
Date: Sat, 17 Jul 2021 11:00:56 -0600

Well Gentlemen, this has turned out to be an interesting issue.

The error message comes from my code, which processes and displays keymap
information.  I wrote the part of the code that raised the error message
at
least 20 years ago and had forgotten about it.  Today, I extended the
message
to identify where it comes from.

The display code has been used many thousands of times, displaying many
keymaps, in Emacs versions dating back possibly as far as 18.59.  The code
has
been in use constantly since that time.  As suggested by what has
happened,
this is the first time that a problem has been flagged in normal use.

The format of Emacs' keymaps has been extended considerably in recent
years,
and the global-map element in question:
(tab-bar menu-item "tab bar" ignore :filter tab-bar-make-keymap)
is different enough to have caused the message.  Overall, this issue is an
example of how changing Emacs specifications can cause downstream, i.e.,
user,
problems.

I apologise for the bug report, there is no bug.  However, interesting
issues
have been raised, which I hope I have explained well enough to give cause
for
thought.

dajo


On Sat, 17 Jul 2021 09:23:50 +0300, Eli Zaretskii <eliz <at> gnu.org> wrote:
>> Date: Fri, 16 Jul 2021 17:15:33 -0600
>> From: <david <at> ngdr.net>
>> 
>> Apparently the global-map has a couple of bad cons cells in it.  I got
>> the
>> following message when I was processing the map.  After that are a few
>> entries
>> from the map itself.
>> 
>> REPORT error BAD CONS CELL (menu-item tab bar ignore :filter
>> tab-bar-make-keymap)
>> (please work out how you did it if you can) press any key to continue.
>> 
>> ..
>> (mouse-4 . mwheel-scroll)
>> (XF86WakeUp . ignore)
>> (tool-bar menu-item tool bar ignore :filter tool-bar-make-keymap)
>> (tab-bar menu-item tab bar ignore :filter tab-bar-make-keymap)
>> (C-f10 . buffer-menu-open)
>> (f10 . menu-bar-open)
>> ..
> 
> Please show the code which triggers this message.
> 
> Thanks.

Message #21 received at 49599-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: <david <at> ngdr.net>
Cc: larsi <at> gnus.org, 49599-done <at> debbugs.gnu.org
Subject: Re: bug#49599: REPORT error BAD CONS CELL
Date: Sat, 17 Jul 2021 20:31:52 +0300

> Date: Sat, 17 Jul 2021 11:00:56 -0600
> From: <david <at> ngdr.net>
> Cc: <49599 <at> debbugs.gnu.org>
> 
> I apologise for the bug report, there is no bug.  However,
> interesting issues have been raised, which I hope I have explained
> well enough to give cause for thought.

OK, thanks for telling us.  I'm therefore closing this bug report.

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