Bus error

[Will Oram]

While processing PS output for a rather large ly project, lily 2.5.16  
experiences a bus error. It says so very quietly in normal output mode,  
so to elaborate in --verbose :

Layout output to `academic.ps'...
[/sw/share/lilypond/2.5.16/ps/music-drawing-routines.ps][/sw/share/ 
lilypond/2.5.16/ps/lilyponddefs.ps][/sw/share/lilypond/2.5.16/fonts/ 
type1//feta-alphabet13.pfa][/sw/share/lilypond/2.5.16/ps/ 
aybabtu.cff.ps][/sw/share/lilypond/2.5.16/ps/emmentaler-11.cff.ps][/sw/ 
share/lilypond/2.5.16/ps/emmentaler-13.cff.ps]Backtrace:
In /sw/share/guile/1.6/srfi/srfi-1.scm:
    ...
 667:  4  (begin (f (car l)) (lp (cdr l)))
 668:  5* [#<procedure #f (f)> "academic.ly"]
In /sw/share/lilypond/2.5.16/scm/lily.scm:
 306:  6* [catch ly-file-failed #<procedure #f ()> #<procedure #f (key  
arg)>]
In unknown file:
   ?:  7* [#<procedure #f ()>]
In /sw/share/lilypond/2.5.16/scm/lily.scm:
 306:  8* [ly:parse-file "academic.ly"]
In /sw/share/lilypond/2.5.16/ly/init.ly:
   8:  9* (if (pair? toplevel-scores) (ly:parser-print-book parser #))
   9: 10  [ly:parser-print-book #<my_lily_parser  > #<Book>]
In unknown file:
   ?: 11* [output-framework "academic" #<Paper_book > ...]
In /sw/share/lilypond/2.5.16/scm/framework-ps.scm:
 263: 12* (let* (# # # ...) (output-scopes scopes fields ...) ...)
 276: 13* [for-each #<procedure #f (page)> (# # # # ...)]
In /sw/share/guile/1.6/srfi/srfi-1.scm:
 663: 14  (if (null? rest) (letrec ((lp #)) (lp list1)) ...)
    ...
 667: 15  (begin (f (car l)) (lp (cdr l)))
 668: 16* [#<procedure #f (page)> #<Stencil  >]
In /sw/share/lilypond/2.5.16/scm/framework-ps.scm:
 279: 17  [dump-page #<Paper_outputter> #<Stencil  > 1 17 #f]
 139: 18* [ly:outputter-dump-stencil #<Paper_outputter> #<Stencil  >]
In unknown file:
   ?: 19* [grob-cause (73.4472536106426 . -193.33300464365) #<Grob Stem  
>]
In /sw/share/lilypond/2.5.16/scm/output-ps.scm:
 207: 20  (let* (# # # # ...) (if # # ""))
 217: 21* [ly:grob-extent #<Grob Stem > #<Grob Stem > 1]
In unknown file:
   ?: 22* [Stem::height #<Grob Stem > 1]
   ?: 23* [Stem::print #<Grob Stem >]

ERROR: In procedure ly_module_lookup:
ERROR: Wrong type argument in position 1 (expecting MODULEP): 214732108

---

I know outputs like these are often not very helpful, so if necessary I  
can create a minimal example of the problem.

Will

focus on the wherefore
for in it lies the question
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