---
** [issues:#4864] using beamed groups across staves - adding a slur or a
phrasing slur causes lilypond to fail with an assertion**
**Status:** New
**Created:** Fri May 27, 2016 09:25 AM UTC by pkx166h
**Last Updated:** Fri May 27, 2016 09:25 AM UTC
**Owner:** nobody
On 26/05/16 10:52, Andrew Bernard wrote:
> I keep finding situations using beamed groups across staves where
> adding a slur or a phrasing slur causes lilypond to fail with the
> following error:
\version "2.19.41"
treble = {
\clef treble
\time 1/4
s4 s
}
bass = {
\clef bass
\time 1/4
%\once \override Beam.positions = #'(4 . 4)
\stemUp
c32[\( c
\change Staff = treble
\stemDown c' e' g' c'' c'
\change Staff = bass
\tuplet 5/4 { e c g, d32\rest e' }
\change Staff = treble
g'
\change Staff = bass
g
\change Staff = treble
a'']\)
}
\score {
\new PianoStaff
<<
\new Staff = "treble" { \treble }
\new Staff = "bass" { \bass }
>>
\layout {
}
}
>
> Processing `/home/andro/work/lilypond/fp/exp-slur-crash.ly'
> Parsing...
> Interpreting music...
> Preprocessing graphical objects...
> Finding the ideal number of pages...
> Fitting music on 1 page...
> Drawing systems...
> /home/andro/work/lilypond/fp/exp-slur-crash.ly:15:6: warning: no
> viable initial configuration found: may not find good beam slope
> c32
> [\( c
> lilypond:
> /home/gub/NewGub/gub/target/linux-64/src/lilypond-git.sv.gnu.org--lilypond.git-release-unstable/flower/include/interval.hh:227:
> T Interval_t::center() const [with T = double]: Assertion `!is_empty
> ()' failed.
>
> Refer to the MWE here for an example. This occurs in 2.19.41 at least.
> I have not tried previous versions.
>
> In other scenarios in my score even when the warning about not finding
> a good beam slope is not emitted I still get the crash reliably in
> this type of situation.
>
> Is this a bug?
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