(iterator-ctor . ,ly:percent-repeat-iterator::constructor)
(start-callback . ,ly:repeated-music::first-start)
(length-callback . ,ly:repeated-music::unfolded-music-length)
(iterator-ctor . ,ly:percent-repeat-iterator::constructor)
(start-callback . ,ly:repeated-music::first-start)
(length-callback . ,ly:repeated-music::unfolded-music-length)