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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: ewoc--adjust ugliness
Date: Wed, 24 May 2006 20:37:25 -0400
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ewoc--adjust refers to a free variable `dll'.  This is not clean, because
that name is short and has no defvar.

When you want to bind a variable in one function
and use it in others, please give it a longer name,
starting with the package prefix, and give it a defvar.