make doc failure

[John Mandereau]

Hi Neil,

It looks like a grob suicides in Documentation/snippets/incipit.ly, as I
get the backtrace below when issuing 'make doc'.  I suspect a check for
SCM_UNSPECIFIED should be added either in the override in incipit.ly or
in system-start-text::calc-y-offset definition, unless there should be
no grob suicide, but then I have no clue.


Backtrace:
In unknown file:
   ?:  0* [lilypond-main #]
In /home/lilydev/git/lily/master/out/share/lilypond/current/scm/lily.scm:
 660:  1* (let* ((failed #)) (if (ly:get-option #) (begin #)) ...)
 660:  2* [lilypond-all #]
 674:  3  (let* ((failed #) (separate-logs #) (ping-log #) ...)
(gc) ...)
 685:  4* [for-each #<procedure #f #> #]
In unknown file:
   ?:  5* [#<procedure #f (x)> "06/lily-d5b250b2.ly"]
In /home/lilydev/git/lily/master/out/share/lilypond/current/scm/lily.scm:
 687:  6* (let* (# # #) (if separate-logs #) (if ping-log #) ...)
 698:  7* [lilypond-file #<procedure #f (key failed-file)>
"06/lily-d5b250b2.ly"]
 725:  8  [catch ly-file-failed #<procedure #f ()> #<procedure #f (x .
args)>]
In unknown file:
   ?:  9* [#<procedure #f ()>]
In /home/lilydev/git/lily/master/out/share/lilypond/current/scm/lily.scm:
 726: 10* [ly:parse-file "06/lily-d5b250b2.ly"]
In /home/lilydev/git/lily/master/out/share/lilypond/current/ly/init.ly:
  40: 11* (let* ((book-handler #)) (cond (# #) (# #)))
  43: 12  (cond (# #) (# #))
In 
/home/lilydev/git/lily/master/out/share/lilypond/current/scm/lily-library.scm:
    ...
 156: 13  [ly:book-process-to-systems #<Book> #< Output_def> ...]
In unknown file:
   ?: 14* [ly:axis-group-interface::height #<Grob System >]
   ?: 15* [#<procedure #f (grob)> #<Grob Spanner >]
In <string>:
   5: 16* [+ 4 {#<unspecified>}]

<string>:5:22: In procedure + in expression (+ 4
(system-start-text::calc-y-offset grob)):
<string>:5:22: Wrong type: #<unspecified>

-- 
John Mandereau <address@hidden>

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