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From: WANG Wei <wangwei_org@sina.com>
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Subject: Re: How to delete/unbind a name defined in Emacs Lisp?
Date: 06 Jan 2004 21:57:42 +0800
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Thank you :-)

Yeah, and by the way, we can even define a function like this:

(let* ((f1 (lambda (x) (1+ x))))
  (funcall f1 2))

but what I want to know is that, if we made some *mistake* and
introduce a function that I didn't need (maybe when debugging?), what
should I do.  then when we press C-h f, we'll find some rubbish there.

Now the only solution is shutting down the Emacs and restart again,
but of course it's not a good idea.