GPF with 2.12

[Stefan Waler]

Hi,

the attached example produces a GPF in lilypond 2.12.

Once again there seems to be something wrong with Bar_engraver in the 
lyrics context.

Stefan

\version "2.12.00"
\include "deutsch.ly"


discantusNotes = {

        \clef treble
        \key g \dorian
        \time 2/1

        \transpose c c \relative c''
        {
                r2 g g1 g2 g g1 c r r2 a a g f2. e8 d e2 a
                fis fis g1 g2 g g1 c r r2 a a g f d2. cis h cis2
        }
}

discantusLyrics = \lyricmode
{
        Der Mey -- e der Mey -- e bringt uns der blüm -- _ _ _ lein
        vil der Mey -- e der Mey -- e bringt uns der blüm -- lein __ _ _ _
}


% ****************************************
% SCORE
% ****************************************


\score {
    \new StaffGroup = choirStaff <<
      \new Voice = "discantusNotes" <<
        \discantusNotes
      >>
      \new Lyrics = "discantusLyrics" \lyricsto discantusNotes { 
\discantusLyrics }
    >>

        \layout {
                \context {
                        \Score
                        % no bars in staves
                        \override BarLine #'transparent = ##t
                }
                
                \context {
                        \Lyrics
                        \consists "Bar_engraver"
                        \override BarLine #'transparent = ##t 
                }
                \context {
                        \StaffGroup
                        \consists "Separating_line_group_engraver"
                }
        }
}