(after-line-breaking-callback ,procedure? "This procedure is called after line breaking. Its return value is ignored.")
(all-elements ,grob-list? "list of all grobs in this line. Its
function is to protect objects from being garbage collected.")
+ (ambituses ,grob-list? "list of Ambitus objects")
(arpeggio ,ly:grob? "pointer to arpeggio object.")
(beam ,ly:grob? "pointer to the beam, if applicable.")
(center-element ,ly:grob? "grob which will be at the center of