Connected arpeggio between voices

[Gilles]

Hi.

Is it possible to connect notes in different voices
with an arpeggio symbol?  E.g. (which doesn't work):

%-----
\version "2.6.3"

upper = \relative c' {
  e'1\arpeggio |
}

lower = \relative c' {
  e1\arpeggio |
}

guitarStaff = \context Staff = "Guitar" {
  <<
    \new Voice { \voiceOne \upper }
    \new Voice { \voiceTwo \lower }
  >>
}

\score {
  \guitarStaff
  \layout {}
}
%-----



Thanks,
Gilles