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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Add M-x occur to the menu-bar
Date: Thu, 12 Feb 2004 09:57:01 -0500
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    > It is cleaner to check for a non-nil value than to
    > check for a local binding.

    I don't follow...  

I confused buffer-local-value with local-variable-p when looking at
the code.  Sorry.