[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #4864 using beamed groups across staves - adding a slur or a phrasing slur causes lilypond to fail with an assertion

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[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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