This engraver makes cross-staff barlines: It catches all normal bar lines, and draws a single span-bar across them.
This engraver creates the following layout objects: SpanBar.
Span_bar_engraver
is part of contexts: GrandStaff, InnerStaffGroup, PianoStaff and StaffGroup
This page is for LilyPond-2.5.11 (development-branch).