#5281 A combination using \partcombine and \tremolo gives a core dump

On Sat, 10 Feb 2018 14:30:13 +0100, Rutger Hofman wrote:

Good afternoon list,

the following combination of \partcombine and \tremolo gives a core dump
with the following error message:

Preprocessing graphical objects...lilypond:
/home/gub/NewGub/gub/target/linux-64/src/lilypond-git.sv.gnu.org--lilypond.git-stable-2.20/flower/include/interval.hh:227:
T Interval_t<T>::center() const [with T = double]: Assertion `!is_empty
()' failed.

If the % \partcombineApart below is uncommented, there is no core dump.

Lilypond:

\version "2.19.80"

upp = \relative c'' {
  \repeat tremolo 32 { d64( b) } |
  d1 |
  b'1:64 |
}

low = \relative c'' {
  % \partcombineApart
  b1 |
  a1 |
  g1:64 |
}

\score {
  <<
    \new Staff \with { instrumentName = "upp" }
    <<
      \upp
    >>
    \new Staff \with { instrumentName = "low" } 
    <<
      \low
    >>
    \new Staff \with { instrumentName = "partcombined" } 
    <<
      \partcombine
      \upp
      \low
    >>
  >>
}

Rutger Hofman
Amsterdam