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Ceci n'est pas un number

From: David Kastrup
Subject: Ceci n'est pas un number
Date: Fri, 04 Mar 2016 12:49:33 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

address@hidden:/usr/local/tmp/lilypond$ guile-1.8 
guile> (number? +nan.0)
guile> address@hidden:/usr/local/tmp/lilypond$ guile-2.0 
GNU Guile 2.0.11
Copyright (C) 1995-2014 Free Software Foundation, Inc.

Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
This program is free software, and you are welcome to redistribute it
under certain conditions; type `,show c' for details.

Enter `,help' for help.
scheme@(guile-user)> (number? +nan.0)
$1 = #t

nan is short for "not a number".

David Kastrup

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