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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: make-obsolete: Recent Signature Change Breaks External Packages
Date: Tue, 05 Jan 2021 19:00:47 +0200
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To: "T.V Raman" <raman@google.com>
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> From: "T.V Raman" <raman@google.com>
> Date: Tue,  5 Jan 2021 08:51:40 -0800 (PST)
> 
> Emacs  28 at Head appears to have changed the signature of function
> make-obsolete to make the third (when ) argument required, used to be
> optional. This now breaks external packages such as jabber.

This is announced in NEWS.  The use of this (and a couple of other)
functions without the WHEN argument has been obsolete since Emacs
23.1.

The packages should adapt.