From luangruo at yahoo.com  Sat Oct  2 13:17:18 2021
From: luangruo at yahoo.com (Po Lu)
Date: Sat, 02 Oct 2021 21:17:18 +0800
Subject: Removal of define-obsolete-variable-alias without when
In-Reply-To: slime-devel-owner@common-lisp.net's message of "Sat, 02 Oct 2021
 05:36:49 +0000 (7 hours, 40 minutes, 7 seconds ago)"
References: <874k9zd0rl.fsf.ref@yahoo.com>
Message-ID: <874k9zd0rl.fsf@yahoo.com>

Calling `define-obsolete-variable-alias' without a when argument was
obsoleted in Emacs 27, and has been deleted from Emacs 28.

SLIME, or at least the version in NonGNU ELPA, still does this in
hyperspec.el, causing a failure to build in Emacs 28.

According to Stefan Monnier:

> The fix is a small matter of adding the WHEN argument (if they really
> can't figure out what this WHEN should be (like a release version or a
> year), they can just put a nil in there (or remove the thing
> altogether since it's probably a sign that it happened long enough ago
> that it's of no importance any more)).

Thanks.