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From: Richard Stallman <rms@gnu.org>
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Subject: Re: sqrt with negative arg.
Date: Thu, 01 Jan 2004 11:30:11 -0500
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    A few hours ago, the documentation of sqrt in numbers.texi was
    changed from saying that it returns a NaN to saying that it signals a
    domain-error.  It definitely returns a NaN on my machine.

I think that is a bug--why does it not signal an error?