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From: Richard Stallman <rms@gnu.org>
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Subject: Re: while-no-input
Date: Thu, 31 Oct 2002 12:25:29 -0500
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    Could you explain what is unclean about using `signal' ?

I already did.  Error handling primitives should not be used for
normal occurrences that are not errors.

I don't have time for more discussion of this--sorry.