Re: Uses derived_mark to avoid segfault (issue 5729051)

[k-ohara5a5a]

http://codereview.appspot.com/5729051/diff/6001/lily/span-bar-stub-engraver.cc
File lily/span-bar-stub-engraver.cc (right):

http://codereview.appspot.com/5729051/diff/6001/lily/span-bar-stub-engraver.cc#newcode46
lily/span-bar-stub-engraver.cc:46: be engraved in contexts where
BarLines are engraved.
So, in the example with the piano staff earlier in the comment,
Four SpanBarStubs are /created/ at each barline,
Two are /engraved/ (those in the Lyrics and Dynamics context which have
the Pure_from_neightbor_engraver, but not those in the Staffs which have
the Bar_line_engraver) and
Zero are printed.

Right?

http://codereview.appspot.com/5729051/