In v2.8, the docs point to an optargs module that exposes an
#:optional formal:*
#(use-modules (ice-9 optargs))
#(define* (textpad padding #:optional once?) . . . )
#:optional doesn't seem to work in v2.11; has it been replaced with
something?
-----------
*
http://lilypond.org/doc/v2.8/Documentation/user/lilypond/Using-LilyPond-syntax-inside-Scheme.html
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