Re: Strange behaviour

[David Wright]

On Mon 13 Nov 2017 at 07:13:10 (-0500), Ben wrote:
> On 11/13/2017 1:58 AM, Don Gingrich wrote:
> >What I want is to effectively have two voices  in the second bar -- The
> >first time through fits the d4 r4 r4 e8 e tune and the second uses d4 (
> >a8) a4 d4 e8 e
> >
> >melody = \relative c' {
> >   \clef treble
> >   \key d \major
> >   \time 2/2
> >   \repeat volta 2 {
> >     d2 \slurDashed d4 ( d)             |
> >     d4 ( \grace a8 ) \grace{ a4 d4} r4 r4 e8 e
> >   }
> >     \bar "|."
> >}
> >
> >
> >
> >It would be good to understand how to insert an occasional bar with an
> >alternate voice -- much vocal music uses a consistent chord progression
> >and accompaniment -- but varies the melody to fit the lyric.
> >
> >
> 
> Hi Don,
> 
> < side note >
> 
> I just encountered a curious crash when I copied your code into my
> Frescobaldi / LilyPond setup on Windows 10:
> (see attached)
> 
> I have never seen any message like this ever before, no idea where
> it came from or what it's talking about but...thought I would share
> in hopes that it made sense to someone.

For a little more info:

Interpreting music...
programming error: moving backwards in time
continuing, cross fingers
lilypond:
/home/gub/NewGub/gub/target/linux-x86/src/lilypond-git.sv.gnu.org--lilypond.git-stable-2.20/lily/sequential-iterator.cc:163:
 virtual void Sequential_iterator::next_element(bool): Assertion 
`!grace_fixups_ || grace_fixups_->start_ >= here_mom_' failed.

Cheers,
David.