Subject: RE: bug#19423: 25.0.50; incompatible change to `make-obsolete' - added 3rd arg should be optional

From: Drew Adams <[email-masked]>
Date: Sun, 21 Dec 2014 09:19:05 -0800 (PST)

Even worse.  It turns out that when parameter WHEN was added
Emacs Dev did the right thing: it *was* optional.

In Emacs 23 someone unwisely changed it to mandatory, an
incompatible change that gratuitously breaks code that could
be used with older Emacs releases.  Pain for no real gain.