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From: "Richard M. Stallman" <rms@gnu.org>
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Subject: Re: derived-mode-run-hooks
Date: Fri, 15 Jul 2005 18:03:38 -0400
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    However, the question is: should I expect for a 22.0.X .elc file to
    work on 21.4? I would've assumed "not", but for this comment on
    `define-derived-mode':

If it is easy to make this work (or work more), we can do it,
but I'd rather not do a lot of work for that sake.
I think that such compatibility is much less important than it once was.
It isn't hard to maintain two sets of .elc files if you have two
Emacs versions installed.