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Re: LilyPond 2.24.0 released!


From: H. S. Teoh
Subject: Re: LilyPond 2.24.0 released!
Date: Fri, 16 Dec 2022 10:33:58 -0800

On Thu, Dec 15, 2022 at 10:42:42PM +0100, Jonas Hahnfeld via LilyPond user 
discussion wrote:
> We are proud to announce the release of GNU LilyPond 2.24.0.
[...]

This latest release broke one of my scores.  I have reduced the problem
to the following snippet:

        \version "2.18.2"
        \score {
            \tuplet 3/2 4 { \repeat tremolo 6 { <cis ais g e>8( } }
        }

Lilypond produces the following error:

        Processing `2.ly'
        Parsing...
        Interpreting music...
        warning: omitting tuplet bracket with neither left nor right bound
        2.ly:3:55: warning: unterminated slur
            \tuplet 3/2 4 { \repeat tremolo 6 { <cis ais g e>8
                                                              ( } }
        Preprocessing graphical objects...
        /usr/src/lilypond/share/lilypond/2.25.0/ly/init.ly:65:2: error: Guile 
signaled an error for the expression beginning here
        #
         (let ((book-handler (if (defined? 'default-toplevel-book-handler)
        In procedure ly:grob-array-ref: Wrong type argument in position 1 
(expecting Grob_array): ()

I have narrowed down the offending commit using git bisect to the
following:

        commit fd92bef058ee0fbbdaafdee0cc056316f6d4b9f9 (HEAD, refs/bisect/bad)
        Author: Jean Abou Samra <jean@abou-samra.fr>
        Date:   Tue Oct 25 00:48:09 2022 +0200

            Move Tuplet_bracket::parallel_beam to objects callbacks

            Not only does this avoid redoing the same computation several 
times, but it
            makes what happens much clearer, because previously, different 
calls to
            Tuplet_bracket::parallel_beam would non-obviously return different 
values
            depending on the caller callback since some of the callers are 
executed before
            line breaking and some after.

Prior to this commit, the original score compiled correctly, albeit with
the same warnings about omitting tuplet brackets.  The output is correct
(a slashed stem with the tuplet number written above the chord).  The
current release, however, does not produce any output because lilypond
aborts after displaying the above error message.

How do I obtain the same output without triggering this error?


--T



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