Ceci n'est pas un number

[David Kastrup]

address@hidden:/usr/local/tmp/lilypond$ guile-1.8 
guile> (number? +nan.0)
#t
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)
$1 = #t
scheme@(guile-user)> 
address@hidden:/usr/local/tmp/lilypond$

nan is short for "not a number".

-- 
David Kastrup