Re: weird error with \repeat tremolo

[Aaron Hill]

On 2019-02-25 1:37 am, N. Andrew Walsh wrote:
> Hi List,
>
> I have the following passage:
>
> --------------------
> \version "2.19.82"
>
>
> \relative c'' {
>  \time 4/8
>   | %45
>   d32\( b g d \repeat tremolo 4 { b32 } \repeat tremolo 8 { g32 }
>
>   | %46
>   \repeat tremolo 8 { d'32 } \repeat tremolo 8 { g,32\) }
>
> }
>
> --------------------------
> It compiles fine. But if I move it up one octave -- either by changing 
> the
> enclosing command to \relative c''' or by changing the first note to
> d'32\(, it fails with the following error:
>
> Starting lilypond 2.19.82 [Untitled]...
> Processing `/tmp/frescobaldi-ujaa3_0t/tmptlvddq78/document.ly'
> Parsing...
> Interpreting music...
> 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.
> Exited with return code 6.
>
> I do not have a directory named "/home/gub".
>
> Any ideas what's going wrong here?

That's a failing assertion in the code.  The path is to the compiled 
file when it was built, so it is not relevant to your filesystem.  
Ultimately this is a programming error; but unfortunately, this is at 
the C++ level, so it would require a new build of LilyPond to address.

A similar issue was reported not too long ago regarding tremolos and 
beams.  I found via some experimentation that too short of a note stem 
can trigger the failing assertion.  You could try manually lengthening 
the stem to see if it helps as a possible workaround.


-- Aaron Hill