Bug? Lines disappear with rhythmic staff

[Peter Chubb]

I'm using the current 2.12.2 version of lilypond.  The attached file
yields,
   programming error: vertical alignment called before line-breaking
and no lines on the staff.

If I remove the \bar "|." the output is correct.

\version "2.12.2"
recscore=  \context StaffGroup <<
    \context RhythmicStaff = "tambour" {
      \override NoteHead   #'style = #'cross
      \stemUp
        f4 f8 f8 
    }
    \context Staff = "recA" {
      \clef "G^8"
      a''2
      \bar "|."
    }
    >>


\score {
\recscore
 \layout {
    \context{ \RhythmicStaff
              \remove "Time_signature_engraver"
              \remove "Staff_symbol_engraver"
              \remove "Clef_engraver"
%             \remove "Bar_engraver"
              \consists "Instrument_name_engraver"
              \override BarLine #'transparent = ##t
            }
    \context{ \Staff
              \remove "Time_signature_engraver"
            }

  }
}

--
Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
http://www.ertos.nicta.com.au           ERTOS within National ICT Australia
A university is a non-profit organisation only in the sense that it
spends everything it gets  ... Luca Turin.