[bug] 2.20.0 -> 2.21.1 Multi_measure_rest_engraver

[Trevor Bača]

Hi,

The following MWE works under 2.20.0 but crashes LilyPond under 2.21.1.

### WORKS UNDER 2.20.0 ###

\version "2.20.0"

\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 2.20.0
Processing `illustration.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-kmhqj8'...
Converting to `illustration.pdf'...
Deleting
`/var/folders/0k/3dbjvd1548b0wkstx2lyb60w0000gn/T//lilypond-kmhqj8'...
Success: compilation successfully completed

[image: mmrest.png]

### CRASHES UNDER 2.21.1 ###

\version "2.21.1"

\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 2.21.1
Processing `illustration.ly'
Parsing...
Interpreting music...
Preprocessing graphical objects...
< halt >


The workaround appears to be to use 2.20.0 until the 2.21.1 bug can be
tracked down.

Trevor.

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