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news and docs for command-error-function

From: Jarek Czekalski
Subject: news and docs for command-error-function
Date: Sun, 29 Dec 2013 12:47:47 +0100
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20120824 Thunderbird/15.0


We modified keyboard.c (r114987 114988 114991) and in 114988 you removed the following from the docs:

-This variable is initialized with Emacs default error output function.
-It is suggested that user functions are added using add-function. */);

I thought it would be good to describe 3 things:

1. suggested way to use this variable (add-function)
2. the change in its handling introduced in 24.4
3. the way it could be substituted before 24.4 (a lisp snippet, like in http://lists.gnu.org/archive/html/emacs-devel/2013-10/msg00819.html)

Now I also think both the variable and the function should go to NEWS.

I can prepare these changes if you like, but first I wanted to have an agreement of what should be present there. If someone else wants to do the docs themselves, no problem.


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