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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Is this a bug of Emacs-Lisp?
Date: Sat, 18 Feb 2006 13:34:01 -0500
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    Modify the return value of dummy changed it's defination. Is this
    a bug of Elisp?

It is not a bug.  You modified part of the data structure in the
function definition.