bug#22272: 24.5; nonfunctional Emacs with a bad global mode (post-command-hook).

[Bruno BARBIER]

On Wed, Dec 30, 2015 at 09:28:31PM +0100, Michael Heerdegen wrote:
> Bruno BARBIER <brubar.cs@gmail.com> writes:
> 
> >    1. the error is not silenced,
> >
> >    2. and the function is not removed.
> >
> > Thus, the error is constantly raised rendering Emacs
> > nonfunctional. That's why I had to ask the OS to kill my Emacs.  
> >
> > So, I'm saying Emacs could be slightly improved by following what the
> > documentation says. 
> >
> > Am I wrong ? 
> 
> Emacs behaves as documented, but the situation is more complicated as
> you expect - See the code `define-globalized-minor-mode':
> 
> Turning on a globalized minor mode pushes a function to
> change-major-mode-hook that adds a function to post-command-hook - and
> that's the one that fails.  So the cited behavior of Emacs removing the
> erroneous function from post-command-hook doesn't solve the problem
> permanently.

Ok. I see. Not that simple indeed and I was wrong: the error is
silenced and the function removed (but `change-major-mode-hook' pushes
it back into `post-command-hook' as instructed by
`define-globalized-minor-mode').

The simplest solution is probably to use a spare Emacs when
developping a new global mode and to catch errors in it; that makes
sense.


I guess this non bug should be closed. Sorry for the noise.

Thanks Eli and Michael for your prompt reply and your time.

Bruno.
 
> 
> Michael.
>