slur repeat and alternative

[Jose]

Excuse my poor english (I'm french).

With lilypond 2.0 on Linux RH 7.3 , i can't obtain
what i want with the following : 
\score {
        \notes {
                \time 4/4
                \clef bass
                \repeat volta2 { c4 d e f( }
                \alternative { { d2) d} { f) f,} }
                }
        \paper { }
}

I get the warning :
/home/jose/lilyfiles/gamme.ly:6:29: AVERTISSEMENT: ne peut repérer le début 
d'une liaison:
                \alternative { { d2) d} { f
                                           ) f,}
What I need is a slur between the f and d2 in the first volta box
(that's OK) and a "slur end on the first f in the second volta box.

Thanks.