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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: add-list local value
Date: Wed, 12 Mar 2008 13:51:09 -0400
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To: "Lennart Borgman (gmail)" <lennart.borgman@gmail.com>
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    And if I have a local value and want to add to the global value with 
    add-to-list?

It isn't hard to do this "by hand", and it is rare, so it isn't worth
defining (and documenting!) a new feature.  It would be a change for
the worse.

Emacs is already very complex.  If we added new primitive features
for things like this, it would become far more complex.