Problems with slurs

[Herman Grootaers]

I am using Lilypond 2.5.21, but the bug lso occurred in 1.5.19

I give a snippet (i.e. 2 bars) from the complete score, but maybe it is only 
neccesary to use the soprano-part for the bug-CVS.

%% Start bug report 2.5.19 - 2.5.21
\header { maintainer = "Lezer Herman (Grootaers)"
          lastupdated = "2005/04/27"
        }
\version "2.5.19"
global = { \key f \major
           \time 4/4
           \autoBeamOff
         }
sop = \relative c''
{ bes2.^\>( a4^\( \break
  a4.^\!^\))^\p g8 g4 r
}
alt = \relative c'
{ g2._\>( f4_\( f4._\!_\))_\p e8 e4 r
}
ten = \relative c'
{ c1^\>( c4.^\!)^\p c8 c4 r
}
bas = \relative c
{ e2._\>( f4_\( c4._\!_\))_\p c8 c4 r
}
koor = \lyricmode
{ го- ро- ди-
}
\score { \context ChoirStaff << \context Staff = "women" << \context Voice = 
"soprano" { \voiceOne << \global \sop >> }
                                                            \context Voice = 
"alto" { \voiceTwo << \global \alt >> }
                                                            \context Lyrics = 
alto { s1 }
                                                         >>
                                \context Staff = "men" << \clef bass
                                                          \context Voice = 
"tenor" { \voiceOne << \global \ten >> }
                                                          \context Voice = 
"bass" { \voiceTwo << \global \bas >> }
                                                       >>
                                \context Lyrics = alto \lyricsto alto \koor
                             >>
         \layout { indent = 0.0\mm
                   \context { \Staff
                            }
                 }
       }
%%  End bug report 2.5.19 - 2.5.21

Included is the outut as seperate file.

The output from Lilypond of this script is :
address@hidden kerk]$ lilypond -f --ps 1
GNU LilyPond 2.5.21
Processing `1'
Parsing...
Interpreting music... [3]
Preprocessing graphical objects...
Calculating line breaks...
programming error: Stem has no extent in Slur_score_state
continuing, cross fingers
programming error: Stem has no extent in Slur_score_state
continuing, cross fingers
Calculating page breaks...
Layout output to `1.ps'...