Subject: bug#20625: 25.0.50; doc of `define-error` is incorrect

From: Stefan Monnier <[email-masked]>
Date: Sat, 23 May 2015 12:15:34 -0400

> In fact, I think that the right change would be not only
> to say what nil MESSAGE means but to make MESSAGE an
> &optional parameter.

I disagree.  The bookmark.el code is just a historical accident.

        Stefan