bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error

bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error

[Eli Zaretskii]

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug@gnu.org mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

  emacs -Q
  C-x RET c utf-8 RET C-x C-g

produces an unexpected error message:

  Wrong type argument: commandp, nil

(What happened here is that I changed my mind after typing the second
C-x and wanted to bail out.  I expected to see "Quit", not an error.)

The problem happens no matter what coding-system you use instead of
utf-8.


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'.
If you would like to further debug the crash, please read the file
d:/gnu/emacs/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600)
 of 2008-10-19 on HOME-C4E4A596F7
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1255
  default-enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<down> <down> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <C-right> <C-right> <C-right> <C-right> <C-right> 
<C-right> <C-right> <C-right> <C-right> <left> <left> 
<left> <left> <left> r C-x C-s C-x C-x C-g <up> <up> 
<up> <up> <up> <up> <up> <up> <C-left> <C-left> C-r 
C-w C-w C-w C-r C-s C-s <prior> <prior> <next> <prior> 
<next> <next> <prior> <prior> <next> <next> M-x s h 
e l l - c o m m <tab> <return> l s <tab> . e <tab> 
d : / g <tab> n <tab> C-h c <tab> e m <tab> SPC C-g 
M-! l s C-h c <tab> C-g C-h f m i n i b u f f e r - 
c o m p l e t e - s h e <tab> <return> C-x C-x C-g 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <up> <up> <up> <up> C-r 
m i n i b C-g C-x o C-x o C-SPC C-x o <down> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <return> C-g <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <down> <down> <up> <down> <down> <down> <down> 
<down> <down> <down> <down> <C-left> <left> <left> 
C-h v <return> C-M-v C-x o <prior> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <help-echo> <help-echo> <help-echo> 
M-! l s SPC d : / g n <tab> e m a <tab> / l i s <tab> 
<left> <left> <left> <left> <left> <tab> <down-mouse-2> 
<mouse-2> <C-left> <C-left> <C-left> C-SPC <C-right> 
<C-right> <C-right> <C-right> C-g C-x o C-x <return> 
c u t f - 8 <return> C-x C-g <help-echo> M-x r e p 
o r t - e m a <tab> <return>

Recent messages:
Saving file d:/gnu/emacs/lisp/simple.el...
Wrote d:/gnu/emacs/lisp/simple.el
Quit
Mark saved where search started
TAB (translated from <tab>) runs the command minibuffer-complete-shell-command
Quit
TAB (translated from <tab>) runs the command minibuffer-complete-shell-command
Quit [3 times]
Mark set
Quit [2 times]
universal-coding-system-argument: Wrong type argument: commandp, nil

bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error

[Glenn Morris]

Eli Zaretskii wrote:

>   emacs -Q
>   C-x RET c utf-8 RET C-x C-g
>
> produces an unexpected error message:
>
>   Wrong type argument: commandp, nil


Perhaps this:


*** mule-cmds.el         5 Oct 2008 19:07:03 -0000 1.341
--- mule-cmds.el         21 Oct 2008 02:52:14 -0000
***************
*** 287,292 ****
--- 287,295 ----
     (cmd (key-binding keyseq))
      prefix)
  
+     (if (char-equal last-input-char ?\C-g)
+     (keyboard-quit))
+ 
      (when (memq cmd '(universal-argument digit-argument))
        (call-interactively cmd)
  

bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Cc: 1205@emacsbugs.donarmstrong.com
> Date: Mon, 20 Oct 2008 22:50:46 -0400
> 
> Eli Zaretskii wrote:
> 
> >   emacs -Q
> >   C-x RET c utf-8 RET C-x C-g
> >
> > produces an unexpected error message:
> >
> >   Wrong type argument: commandp, nil
> 
> 
> Perhaps this:
> 
> 
> *** mule-cmds.el         5 Oct 2008 19:07:03 -0000 1.341
> --- mule-cmds.el         21 Oct 2008 02:52:14 -0000
> ***************
> *** 287,292 ****
> --- 287,295 ----
>      (cmd (key-binding keyseq))
>       prefix)
>   
> +     (if (char-equal last-input-char ?\C-g)
> +     (keyboard-quit))
> + 
>       (when (memq cmd '(universal-argument digit-argument))
>         (call-interactively cmd)

Looks correct to me.  Thanks.

bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error

[Andreas Schwab]

Glenn Morris <rgm@gnu.org> writes:

> +     (if (char-equal last-input-char ?\C-g)

quit_char may not be C-g.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error

[Kevin Rodgers]

Andreas Schwab wrote:
> Glenn Morris <rgm@gnu.org> writes:
> 
>> +     (if (char-equal last-input-char ?\C-g)
> 
> quit_char may not be C-g.

So ?\C-g should be expressed instead as (nth 3 (current-input-mode)),
correct?

-- 
Kevin Rodgers
Denver, Colorado, USA

bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error

[Drew Adams]

> >> +     (if (char-equal last-input-char ?\C-g)
> > 
> > quit_char may not be C-g.
> 
> So ?\C-g should be expressed instead as (nth 3 (current-input-mode)),
> correct?

Essentially the question I asked emacs-devel today (based on this thread, though
I had forgotten where I saw it). See emacs-devel thread "question about
`quit-char'", FYI.

The answer I got was no, not in Emacs 23 (or 22 or 21...). Later, maybe. 

There was a fair amount of noise and distraction in the thread, but that's the
answer I took away for this question.

bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error

[Kevin Rodgers]

Drew Adams wrote:
>>>> +     (if (char-equal last-input-char ?\C-g)
>>> quit_char may not be C-g.
>> So ?\C-g should be expressed instead as (nth 3 (current-input-mode)),
>> correct?
> 
> Essentially the question I asked emacs-devel today (based on this thread, though
> I had forgotten where I saw it). See emacs-devel thread "question about
> `quit-char'", FYI.
> 
> The answer I got was no, not in Emacs 23 (or 22 or 21...). Later, maybe. 
> 
> There was a fair amount of noise and distraction in the thread, but that's the
> answer I took away for this question.

That's not the conclusion I came to, which is: You should feel fairly
confident in binding C-g as a quit character in your code, but
Emacs itself should continue to fully support current-input-mode/
set-input-mode -- unless and until a decision is reached to deprecate
the QUIT functionality they provide.

-- 
Kevin Rodgers
Denver, Colorado, USA

bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error

[Stefan Monnier]

> That's not the conclusion I came to, which is: You should feel fairly
> confident in binding C-g as a quit character in your code, but
> Emacs itself should continue to fully support current-input-mode/
> set-input-mode -- unless and until a decision is reached to deprecate
> the QUIT functionality they provide.

I believe the conclusion of thread is that we should keep doing it the
simple way until either we remove the functionality or we fix all the
code to support the functionality reliably.


        Stefan

bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error

[Drew Adams]

> >>>> +     (if (char-equal last-input-char ?\C-g)
> >>> quit_char may not be C-g.
> >> So ?\C-g should be expressed instead as (nth 3 
> >> (current-input-mode)), correct?
> > 
> > Essentially the question I asked emacs-devel today (based 
> > on this thread, though I had forgotten where I saw it).
> > See emacs-devel thread "question about `quit-char'", FYI.
> > 
> > The answer I got was no, not in Emacs 23 (or 22 or 21...). 
> > Later, maybe. 
> > 
> > There was a fair amount of noise and distraction in the 
> > thread, but that's the answer I took away for this question.
> 
> That's not the conclusion I came to, which is: You should feel fairly
> confident in binding C-g as a quit character in your code, but
> Emacs itself should continue to fully support current-input-mode/
> set-input-mode -- unless and until a decision is reached to deprecate
> the QUIT functionality they provide.

OK, I didn't mean to pronounce on what Emacs would/should support, but rather to
communicate the part about what users should do now in their code. My reading
was not just that one can feel confident using C-g now but that that is what one
should do, for now.

But anyway, you've obviously read the thread, and all I wanted to do was bring
it to your attention.

bug#1205: marked as done (23.0.60; C-x RET c FOO C-x C-g signals an error)

[Emacs bug Tracking System]

[-- Attachment #1: Type: text/plain, Size: 872 bytes --]


Your message dated Wed, 22 Oct 2008 02:45:23 -0400
with message-id <dahc75dt6k.fsf@fencepost.gnu.org>
and subject line Re: bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error
has caused the Emacs bug report #1205,
regarding 23.0.60; C-x RET c FOO C-x C-g signals an error
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact don@donarmstrong.com
immediately.)


-- 
1205: http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=1205
Emacs Bug Tracking System
Contact don@donarmstrong.com with problems

[-- Attachment #2: Type: message/rfc822, Size: 5586 bytes --]

From: Eli Zaretskii <eliz@gnu.org>
To: emacs-pretest-bug@gnu.org
Subject: 23.0.60; C-x RET c FOO C-x C-g signals an error
Date: Sun, 19 Oct 2008 17:12:33 +0200
Message-ID: <utzb8k49q.fsf@gnu.org>


Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug@gnu.org mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

  emacs -Q
  C-x RET c utf-8 RET C-x C-g

produces an unexpected error message:

  Wrong type argument: commandp, nil

(What happened here is that I changed my mind after typing the second
C-x and wanted to bail out.  I expected to see "Quit", not an error.)

The problem happens no matter what coding-system you use instead of
utf-8.


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'.
If you would like to further debug the crash, please read the file
d:/gnu/emacs/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600)
 of 2008-10-19 on HOME-C4E4A596F7
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ENU
  value of $XMODIFIERS: nil
  locale-coding-system: cp1255
  default-enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  shell-dirtrack-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<down> <down> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <up> <C-right> <C-right> <C-right> <C-right> <C-right> 
<C-right> <C-right> <C-right> <C-right> <left> <left> 
<left> <left> <left> r C-x C-s C-x C-x C-g <up> <up> 
<up> <up> <up> <up> <up> <up> <C-left> <C-left> C-r 
C-w C-w C-w C-r C-s C-s <prior> <prior> <next> <prior> 
<next> <next> <prior> <prior> <next> <next> M-x s h 
e l l - c o m m <tab> <return> l s <tab> . e <tab> 
d : / g <tab> n <tab> C-h c <tab> e m <tab> SPC C-g 
M-! l s C-h c <tab> C-g C-h f m i n i b u f f e r - 
c o m p l e t e - s h e <tab> <return> C-x C-x C-g 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <up> <up> <up> <up> C-r 
m i n i b C-g C-x o C-x o C-SPC C-x o <down> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <return> C-g <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <up> 
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 
<up> <down> <down> <up> <down> <down> <down> <down> 
<down> <down> <down> <down> <C-left> <left> <left> 
C-h v <return> C-M-v C-x o <prior> <up> <up> <up> <up> 
<up> <up> <up> <up> <up> <help-echo> <help-echo> <help-echo> 
M-! l s SPC d : / g n <tab> e m a <tab> / l i s <tab> 
<left> <left> <left> <left> <left> <tab> <down-mouse-2> 
<mouse-2> <C-left> <C-left> <C-left> C-SPC <C-right> 
<C-right> <C-right> <C-right> C-g C-x o C-x <return> 
c u t f - 8 <return> C-x C-g <help-echo> M-x r e p 
o r t - e m a <tab> <return>

Recent messages:
Saving file d:/gnu/emacs/lisp/simple.el...
Wrote d:/gnu/emacs/lisp/simple.el
Quit
Mark saved where search started
TAB (translated from <tab>) runs the command minibuffer-complete-shell-command
Quit
TAB (translated from <tab>) runs the command minibuffer-complete-shell-command
Quit [3 times]
Mark set
Quit [2 times]
universal-coding-system-argument: Wrong type argument: commandp, nil



[-- Attachment #3: Type: message/rfc822, Size: 1693 bytes --]

From: Glenn Morris <rgm@gnu.org>
To: 1205-done@emacsbugs.donarmstrong.com
Subject: Re: bug#1205: 23.0.60; C-x RET c FOO C-x C-g signals an error
Date: Wed, 22 Oct 2008 02:45:23 -0400
Message-ID: <dahc75dt6k.fsf@fencepost.gnu.org>

2008-10-22  Glenn Morris  <rgm@gnu.org>

   * international/mule-cmds.el (universal-coding-system-argument):
     Check for C-g.  (Bug#1205)