Warnings in the documented example

[Jefferson dos Santos Feli]

The example below extracted from the documentation, which demonstrates how to 
use partcombine, is showing warnings in lilypond 2.14.2 as "cannot end slur" 
and "already have slur."

musicUp = \relative c'' {
  \time 4/4
  a4 c4.( g8) a4 |
  g4 e' g,( a8 b) |
  c b a2.
}

musicDown = \relative c'' {
  g4 e4.( d8) c4 |
  r2 g'4( f8 e) |
  d2 \stemDown a
}

\score {
  <<
    <<
    \new Staff {
      \set Staff.instrumentName = "Standard polyphony  "
      << \musicUp \\ \musicDown >>
    }
    \new Staff \with { printPartCombineTexts = ##f } {
      \set Staff.instrumentName = "PartCombine without texts  "
      \partcombine \musicUp \musicDown
    }
    \new Staff {
      \set Staff.instrumentName = "PartCombine with texts  "
      \partcombine \musicUp \musicDown
    }
    >>
  >>
  \layout {
    indent = 6.0\cm
    \context {
      \Score
      \override SystemStartBar #'collapse-height = #30
    }
  }
}

- Is it a bug? How can I avoid this warnings?
- Another question, how do I put slurs on both notes (musicUp and
musicDown)?

Best regards,

Jefferson dos Santos Felix
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