slur and \alternative

[胡海鹏 - Hu Haipeng]

Hello,
  I'm encounting the error of ending slurs in alternative. THe following snippet describes it. In fact, in my orchestration exercise, all two endings can't find either beginning and ending of the slurs. How to solve this?

Regards
Haipeng

\version "2.13.4"

\score {
  \new Staff { \relative c' {
    \clef treble \time 2/4
    \repeat volta 2 {
      c8( d e f  |
    }
    \alternative { { g2) } { g8 f e d | c2) } }
  }
  }
  \layout { }
}

 

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