* About `unload-feature'
@ 2013-01-01 22:31 Xue Fuqiao
2013-01-01 23:23 ` Dmitry Gutov
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Xue Fuqiao @ 2013-01-01 22:31 UTC (permalink / raw)
To: help-gnu-emacs
(info "(elisp) Unloading") says:
Before restoring the previous definitions, `unload-feature' runs `remove-hook' to remove functions in the library from certain hooks. These hooks include variables whose names end in `-hook' (or the deprecated suffix `-hooks'), plus those listed in `unload-feature-special-hooks', as well as `auto-mode-alist'. This is to prevent Emacs from ceasing to function because important hooks refer to functions that are no longer defined.
What does `ceasing to function' mean? Can anybody help? Thanks.
--
Best regards, Xue Fuqiao.
http://www.emacswiki.org/emacs/XueFuqiao
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: About `unload-feature'
2013-01-01 22:31 About `unload-feature' Xue Fuqiao
@ 2013-01-01 23:23 ` Dmitry Gutov
2013-01-02 13:05 ` Xue Fuqiao
[not found] ` <mailman.16498.1357082632.855.help-gnu-emacs@gnu.org>
2013-01-08 15:50 ` Stefan Monnier
2 siblings, 1 reply; 5+ messages in thread
From: Dmitry Gutov @ 2013-01-01 23:23 UTC (permalink / raw)
To: Xue Fuqiao; +Cc: help-gnu-emacs
Xue Fuqiao <xfq.free@gmail.com> writes:
> (info "(elisp) Unloading") says:
>
> Before restoring the previous definitions, `unload-feature' runs `remove-hook'
> to remove functions in the library from certain hooks. These hooks include
> variables whose names end in `-hook' (or the deprecated suffix `-hooks'), plus
> those listed in `unload-feature-special-hooks', as well as `auto-mode-alist'.
> This is to prevent Emacs from ceasing to function because important hooks refer
> to functions that are no longer defined.
>
> What does `ceasing to function' mean? Can anybody help? Thanks.
Looks like a hyperbole.
It would still function, but signal [lots of] "function is undefined" errors.
^ permalink raw reply [flat|nested] 5+ messages in thread[parent not found: <mailman.16498.1357082632.855.help-gnu-emacs@gnu.org>]
* Re: About `unload-feature'
[not found] ` <mailman.16498.1357082632.855.help-gnu-emacs@gnu.org>
@ 2013-01-02 1:10 ` Barry Margolin
0 siblings, 0 replies; 5+ messages in thread
From: Barry Margolin @ 2013-01-02 1:10 UTC (permalink / raw)
To: help-gnu-emacs
In article <mailman.16498.1357082632.855.help-gnu-emacs@gnu.org>,
Dmitry Gutov <dgutov@yandex.ru> wrote:
> Xue Fuqiao <xfq.free@gmail.com> writes:
>
> > (info "(elisp) Unloading") says:
> >
> > Before restoring the previous definitions, `unload-feature' runs
> > `remove-hook'
> > to remove functions in the library from certain hooks. These hooks include
> > variables whose names end in `-hook' (or the deprecated suffix `-hooks'),
> > plus
> > those listed in `unload-feature-special-hooks', as well as
> > `auto-mode-alist'.
> > This is to prevent Emacs from ceasing to function because important hooks
> > refer
> > to functions that are no longer defined.
> >
> > What does `ceasing to function' mean? Can anybody help? Thanks.
>
> Looks like a hyperbole.
>
> It would still function, but signal [lots of] "function is undefined" errors.
There are some hooks that are run very frequently -- if these signalled
an error every time, Emacs would be effectively unusable.
--
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: About `unload-feature'
2013-01-01 22:31 About `unload-feature' Xue Fuqiao
2013-01-01 23:23 ` Dmitry Gutov
[not found] ` <mailman.16498.1357082632.855.help-gnu-emacs@gnu.org>
@ 2013-01-08 15:50 ` Stefan Monnier
2 siblings, 0 replies; 5+ messages in thread
From: Stefan Monnier @ 2013-01-08 15:50 UTC (permalink / raw)
To: help-gnu-emacs
> What does `ceasing to function' mean?
To see an example of "ceases to function", try for example:
M-: (use-global-map (make-keymap)) RET
There are of course many other ways to make Emacs cease to function.
The sky is the limit.
Stefan
^ permalink raw reply [flat|nested] 5+ messages in thread
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2013-01-01 22:31 About `unload-feature' Xue Fuqiao
2013-01-01 23:23 ` Dmitry Gutov
2013-01-02 13:05 ` Xue Fuqiao
[not found] ` <mailman.16498.1357082632.855.help-gnu-emacs@gnu.org>
2013-01-02 1:10 ` Barry Margolin
2013-01-08 15:50 ` Stefan Monnier
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