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About `unload-feature'

From: Xue Fuqiao
Subject: About `unload-feature'
Date: Wed, 2 Jan 2013 06:31:46 +0800

(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.

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