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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Strange change in backquote expansion
Date: Mon, 20 Aug 2007 11:16:16 -0400
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On a related issue, the Lisp manual says that the old syntax with an
extra level of parens around the args of backquote and comma is still
supported for compatibility with versions before 19.29.

Since 19.29 was 12 years ago, I think it is time to delete the
documentation of that compatibility feature.  Does anyone object?