Re: [Lilypond-auto] Issue 3799 in lilypond: Avoid macro at top-level in ly/satb.ly

[lilypond]

Comment #1 on issue 3799 by address@hidden: Avoid macro at top-level in  
ly/satb.ly
http://code.google.com/p/lilypond/issues/detail?id=3799

Checking definedness in a macro works fine in Guile 2; what doesn't work is  
doing it at runtime, e.g. (if (defined? 'x) x #f), because Guile complains  
about the undefined variable while compiling. But even that works in  
(define x (if (defined? 'x) x y)), which if how Guile 2 implements  
define-once.

...but define-once is clearer anyway. I'll make a patch.

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