GNU bug report logs - #938
23.0.60; debug-on-error sometimes fails to debug on error

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Markus Triska <markus.triska <at> gmx.at>
To: emacs-pretest-bug <at> gnu.org
Subject: 23.0.60; debug-on-error sometimes fails to debug on error
Date: Tue,  9 Sep 2008 01:29:54 +0200 (CEST)

In emacs -Q, when I evaluate the forms:

   (defun my-err ()
     (error "Err"))

   (toggle-debug-on-error)   

   (add-hook 'post-command-hook 'my-err)

I get:

   Error in post-command-hook: (error Err)

and do not see the debugger.


In GNU Emacs 23.0.60.11 (i386-apple-darwin8.11.1, GTK+ Version 2.12.9)
 of 2008-09-02 on mt-computer.local
Windowing system distributor `The XFree86 Project, Inc', version 11.0.40400000
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: en.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

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From: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
To: Markus Triska <markus.triska <at> gmx.at>
Cc: 938 <at> debbugs.gnu.org
Subject: bug#938: 23.0.60; debug-on-error sometimes fails to debug on error
Date: Sun, 11 Sep 2011 19:45:56 +0200

Markus Triska <markus.triska <at> gmx.at> writes:

> In emacs -Q, when I evaluate the forms:
>
>    (defun my-err ()
>      (error "Err"))
>
>    (toggle-debug-on-error)   
>
>    (add-hook 'post-command-hook 'my-err)
>
> I get:
>
>    Error in post-command-hook: (error Err)
>
> and do not see the debugger.

I'm not sure this is a bug or a feature.  Having `post-command-hook'
actually throw up a debugging window would make Emacs almost unusable,
wouldn't it?

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

Message #16 received at 938 <at> debbugs.gnu.org (full text, mbox):

From: Lars Magne Ingebrigtsen <larsi <at> gnus.org>
To: Markus Triska <markus.triska <at> gmx.at>
Cc: 938 <at> debbugs.gnu.org
Subject: Re: 23.0.60; debug-on-error sometimes fails to debug on error
Date: Sun, 25 Sep 2011 23:45:59 +0200

Lars Magne Ingebrigtsen <larsi <at> gnus.org> writes:

> I'm not sure this is a bug or a feature.  Having `post-command-hook'
> actually throw up a debugging window would make Emacs almost unusable,
> wouldn't it?

So I think this is a feature, and not a bug, so I'm closing the report.

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

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