ADD_ACKNOWLEDGER (Span_bar_stub_engraver, span_bar);
ADD_ACKNOWLEDGER (Span_bar_stub_engraver, hara_kiri_group_spanner);
ADD_TRANSLATOR (Span_bar_stub_engraver,
ADD_ACKNOWLEDGER (Span_bar_stub_engraver, span_bar);
ADD_ACKNOWLEDGER (Span_bar_stub_engraver, hara_kiri_group_spanner);
ADD_TRANSLATOR (Span_bar_stub_engraver,