https://bugzilla.redhat.com/show_bug.cgi?id=1216312
--- Comment #9 from Jon Ciesla limburgher@gmail.com ---
From a user:
lilypond: /home/gub/NewGub/gub/target/linux-64/src/lilypond-git.sv.gnu.org--lilypond.git-release-unstable/flower/include/interval.hh:226: T Interval_t<T>::center() const [with T = double]: Assertion `!is_empty ()' failed.
Occurs only on lilypond 2.19.21 and up.
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