with @code{breakable=##t}."
'(breakable))
-(ly:add-interface
- 'vertically-spaceable-interface
- "Objects that should be kept at constant vertical distances. Typically:
-@rinternals{VerticalAxisGroup} objects of @rinternals{Staff} contexts."
- '())
-
(ly:add-interface
'volta-interface
"A volta repeat."