Hi there,
Thank you for all your work on LilyPond!
It appears to be impossible to use a Melody_engraver in a Voice that also
includes a CueVoice. Here’s a LilyPond example that illustrates the issue:
```
\version "2.22.0"
\new Voice \with {
\consists "Melody_engraver"
\override Stem.neutral-direction = #'()
} {
<<
{ r }
\new CueVoice { c'' }
>>
}
```
LilyPond outputs:
GNU LilyPond 2.22.0
Processing `test.ly'
Parsing...
Interpreting music...
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...Assertion failed: (d == 1 || d == -1), function at, file
/private/tmp/lilypond-20210130-26352-lkbhbf/lilypond-2.22.0/build/../flower/include/drul-array.hh,
line 35.
All the best,
Nate
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