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From: Richard M. Stallman <rms <at> gnu.org>
Subject: Re: defvars at compile time
Newsgroups: gmane.emacs.devel
Date: 2005-09-17 04:57:28 GMT (2 years, 46 weeks, 4 days, 4 hours and 3 minutes ago)
The only effect of a defvar with no initial value
is to silence the compiler.  So it is superfluous
to put it inside eval-when-compile.