Re: [bug] 2.20.0 -> 2.21.1 Multi_measure_rest_engraver

[Trevor Bača]

On Wed, May 6, 2020 at 7:06 PM David Kastrup <address@hidden> wrote:

> Valentin Villenave <address@hidden> writes:
>
> > On 5/6/20, Trevor Bača <address@hidden> wrote:
> >> The following MWE works under 2.20.0 but crashes LilyPond under 2.21.1.
> >
> > Wow, that’s a nice one. I’m marking this as Critical because its a/ a
> > segfault, b/ a regression and c/ not that unusual a use case.
> > https://sourceforge.net/p/testlilyissues/issues/5964/
> > Since it got broken recently, that should be fairly easy to bisect.
>
> Uh, there are several years of development between 2.20.0 and 2.21.1.
> Unfortunately.  But at least few version changes...
>

Actually, only one version to check! The problem entered sometime between
2.19.84 and 2.21.1.

MWE works under 2.19.84:

### WORKS UNDER 2.19.84 ###

\version "2.19.84"

\layout {
    \context {
        \name GlobalRests
        \type Engraver_group
        \consists Multi_measure_rest_engraver
    }
    \context {
        \name GlobalContext
        \type Engraver_group
        \accepts GlobalRests
    }
    \context {
        \Score
        \accepts GlobalContext
    }
}

\new Score
<<
    \new GlobalContext
    {
        \new GlobalRests { R1 }
    }
    \new Staff { \time 4/4 R1 }
>>

### END ###

GNU LilyPond 2.19.84
Processing `test.ly'
Parsing...
Interpreting music...
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Layout output to
`/var/folders/0k/3dbjvd1548b0wkstx2lyb60w0000gn/T//lilypond-3FIYkv'...
Converting to `test.pdf'...
Deleting
`/var/folders/0k/3dbjvd1548b0wkstx2lyb60w0000gn/T//lilypond-3FIYkv'...
Success: compilation successfully completed

HTH,

Trevor.

-- 
Trevor Bača
www.trevorbaca.com
soundcloud.com/trevorbaca