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Re: Core dump for tremolo

From: Knut Petersen
Subject: Re: Core dump for tremolo
Date: Sat, 16 Sep 2017 09:18:08 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0

Am 15.09.2017 um 23:20 schrieb David Kastrup:

\version "2.19.39"

\relative c' {
      c8:32 c32 c c c

Preprocessing graphical objects...lilypond:
T Interval_t<T>::center() const [with T = double]: Assertion `!is_empty ()'
Aborted (core dumped)

Rutger Hofman
This is still an issue of current master ... has anybody investigated
the problem ?
I don't know whether we have an issue in the tracker for this, but it
will always be an issue since there is no valid output for this input
(I don't think one can have both a flag and a stem tremolo).

Well, we actually can have both a flag and a stem tremolo. Add \autoBeamOff to 
Rutger's mwe, it will compile and give an output with flag and tremolo.

In some cases we even can have a beam and a stem repeat on one note:

\version "2.21.0"
\relative c' {  c8 c32 c c c c8 c c c c8:32 c32 [c c c] }

Of course, autobeaming is painfully wrong here.

  Aborting with a core dump (and a cryptic message not obviously related to the 
input) is of course about the worst possible diagnostic,
I agree.

but we would not be able to produce valid graphics either.
No. There is a solution for this input, but lilypond fails miserably.


Attachment: Berg_Lulu_Adagio_Bar155.jpg
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