Comment #1 on issue 1427 by PhilEHolmes: \bookpart stored in a variable
can't contain markup
http://code.google.com/p/lilypond/issues/detail?id=1427
Neil Puttock commented:
The same happens for page-markers (i.e., \break, \pageBreak, \label, etc.):
mypart = \bookpart {
\label #'foo
}
% also crashes
\bookpart { \mypart }
It seems that when a book is cloned, the copy constructor assumes all
elements in the original book to be scores, which is unsafe: the
elements can also be markup or page-markers:
#(display (ly:score? (car (ly:book-scores mypart))))
-> #f
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