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From: Glenn Morris <rgm@gnu.org>
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Subject: Re: Trying to cope with Calendar's dynamic scoping
Date: Thu, 05 Sep 2013 21:20:49 -0400
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To: Stefan Monnier <monnier@IRO.UMontreal.CA>
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Stefan Monnier wrote:

> But it means we have to keep using dynamic scoping for `date' and
> `entry', for now.

Well, it has to be done at some point, doesn't it?
And can't you have code which works in either version just by using
  (if (boundp 'diary-date) diary-date date)
?