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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: strange byte compiler behavior
Date: Sun, 06 Jan 2008 13:09:23 -0500
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To: Stefan Monnier <monnier@iro.umontreal.ca>
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Xref: news.gmane.org gmane.emacs.devel:86359
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    They are, but elsewhere and the byte-compiler only knows about it via
    `boundp': it doesn't keep its own list of defvar'd variables.

Indeed, that is true.  But we COULD make it check for a variable doc
string instead.

The effect would be that variables defvar'd in another file with no
doc string would get warnings.  Maybe that is not a bad result.