cross staff/voice arpeggio error

[Jay Anderson]

The example below produces garbled output. If you add \arpeggio to the
first c2 in the top staff no errors are produced (except I don't want
the arpeggio to extend up there :). Here's the error:

GNU LilyPond 2.11.21
Processing `test3.ly'
Parsing...
Interpreting music...
Preprocessing graphical objects...
warning: vertical alignment called before line-breaking.
Only do cross-staff spanners with PianoStaff.
Layout output to `test3.ps'...
Converting to `test3.pdf'...

\version "2.11.21"

\layout
{
 ragged-right = ##t
}

\new PianoStaff
<<
 \set PianoStaff.connectArpeggios = ##t

 \new Staff
 \relative c''
 {
   c2 c2\arpeggio
 }
 \new Staff
 \relative c''
 {
   <<
     {
       c2\arpeggio c2\arpeggio
     }
     \\
     {
       g4\arpeggio a g4\arpeggio a
     }
   >>
 }
> >

-----Jay Anderson