Wrong Type Argument 2.0

[Will Oram]

This started out a few days ago in lilypond-user, where I sent it not  
knowing if a bug was causing it or not. More tests indicate it  
probably is.

---

Two-pass vertical spacing seems to be crashing with sufficiently  
large scores AND forcing line breaks. For example, the output below  
is pass one of the two-pass vertical spacing process. Note that if I  
just run it without the first pass in lilypond there are no crashes.

spamguy$ /Users/spamguy/LilyPond.app/Contents/Resources/bin/./ 
lilypond -dbackend=null -d dump-tweaks x.ly

[lots of interpreting, petty warnings, etc; nothing unusual]

MIDI output to `x.midi'...
warning: MIDI channel wrapped around
warning: remapping modulo 16
warning: MIDI channel wrapped around
warning: remapping modulo 16
warning: MIDI channel wrapped around
warning: remapping modulo 16
warning: MIDI channel wrapped around
warning: remapping modulo 16
warning: MIDI channel wrapped around
warning: remapping modulo 16
warning: MIDI channel wrapped around
warning: remapping modulo 16
warning: MIDI channel wrapped around
warning: remapping modulo 16
warning: Can't fit systems on page -- ignoring between-system-padding
warning: Can't fit systems on page -- ignoring between-system-padding
/Users/spamguy/LilyPond.app/Contents/Resources/bin/../share/lilypond/ 
current/scm/layout-page-dump.scm:123:36: In procedure - in expression  
(- space-left stretch):
/Users/spamguy/LilyPond.app/Contents/Resources/bin/../share/lilypond/ 
current/scm/layout-page-dump.scm:123:36: Wrong type argument in  
position 1: #f

The code below is enough  to do it. It's not meant to run straight  
from the e-mail, as there are too many instruments to include.  
However, I've trimmed it down to the minimum # of instruments needed  
and removed any excess content. That is, take out \spacing and it  
works. Take out the two-pass process and it works (duh).

spacing =  {
        s1*3    \break
        s1*3    \break
        s1*3    \break
        s1*4    \break
        s1*3    \break
        s1*4    \break
        s1*3    \break
        s1*3    \break
        s1*3    \break
        s1*4    \break
        s1*5    \break
}


\score {
<<
                \new Staff <<
                        \scoreTweak "xyz"
                        \spacing
                        \partcombine
                                \relative a'' { \mIIIFluteI }
                                \relative f'' { \mIIIFluteII }
                >>
        
                \new Staff <<
                        \partcombine
                                \relative a'' { \mIIIOboeI }
                                \relative c'' { \mIIIOboeII }
                >>
                
                \new Staff <<
                        \partcombine
                                \relative f'' { \mIIIClarinetI }
                                \relative a' { \mIIIClarinetII }
                >>
                
                \new Staff <<
                        \partcombine
                                \relative c' { \mIIIBassoonI }
                                \relative a { \mIIIBassoonII }
                >>
>>

\layout {
        \context { \RemoveEmptyStaffContext }
        \context {
                \Score
                \override InstrumentName #'X-offset = #-9
        }
        #(define tweak-key "xyz")
}
}

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