(,ly:side-position-interface::y-aligned-side . ,ly:side-position-interface::pure-y-aligned-side)
(,ly:slur::height . ,ly:slur::pure-height)
(,ly:slur::outside-slur-callback . ,ly:slur::pure-outside-slur-callback)
(,ly:side-position-interface::y-aligned-side . ,ly:side-position-interface::pure-y-aligned-side)
(,ly:slur::height . ,ly:slur::pure-height)
(,ly:slur::outside-slur-callback . ,ly:slur::pure-outside-slur-callback)