> Maybe something like [...] Interestingly, I got the following assertion failure with a self-compiled 2.19.4 (or so) while trying to process your example:
../flower/include/drul-array.hh:35:
T& Drul_array<T>::at(Direction) [with T = Skyline]:
Assertion `d == 1 || d == -1' failed.
I will update lilypond to current git and test it again.
Werner
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