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From: Jay Belanger <jay.p.belanger@gmail.com>
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Subject: Re: Avoiding 'reference to free variable' warnings while splitting
	elisp source files
Date: Sat, 23 Mar 2013 11:11:19 -0500
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> Is there a sane way to split the source of an elisp file
> while avoiding the 'reference to free variable' warnings
> when byte-compiling?
>
> The problem arises when a variable defined in one file
> is used in another.   How does one avoid those errors?

You can put
(defvar variable-name)
in the other file.