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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: pp-eval-expression enhancements
Date: Wed, 25 Jul 2007 11:02:31 -0400
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    What about also replacing the binding of `M-:' so that it invokes
    `pp-eval-expression'?

I don't know if this is safe.  There may be Lisp objects for which
print works and pretty-print fails.  And others have pointed out
other problems (though we could avoid them by making a new command
which is just like eval-expression except that it pretty-prints).