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From: Richard Stallman <rms@gnu.org>
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Subject: Re: Incompatible change without "warning"
Date: Wed, 20 Apr 2005 10:57:00 -0400
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    How about adding an optional argument to defvaralias so that:

    (defvaralias 'tooltip-use-echo-area 'tooltip-gud-echo-area)
    (make-obsolete-variable 'tooltip-use-echo-area 'tooltip-gud-echo-area "22.1")

    can be written as:

    (defvaralias 'tooltip-use-echo-area 'tooltip-gud-echo-area nil "22.1")

It looks good to me.