[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5964 Multi_measure_rest_engraver segfaults when its context doesn’t include Staff_symbol_engraver.

[Auto mailings of changes to Lily Issues via Testlilyissues-auto]

Use `oneline’ when there’s either no staff OR a one-line staff

https://codereview.appspot.com/576090043

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[issues:#5964] Multi_measure_rest_engraver segfaults when its context doesn’t include Staff_symbol_engraver.

Status: Started
Created: Wed May 06, 2020 10:47 PM UTC by Valentin Villenave
Last Updated: Thu May 07, 2020 08:26 AM UTC
Owner: nobody

This used to work as recently as 2.20.0, and it no longer does:

\version 2.21.1
\layout {
  \context {
    \type Engraver_group
    \name GlobalRests
    %\consists Staff_symbol_engraver
    %\omit StaffSymbol
    \consists Multi_measure_rest_engraver
  }
  \context {
    \Score
    \accepts GlobalRests
  }
}
\score {
    \new GlobalRests { R1 }
}

Uncommenting the Staff_symbol_engraver prevents the segfault from happening.
Here’s what gdb has to say:

Program received signal SIGSEGV, Segmentation fault.
Grob::internal_get_property (this=this@entry=0x0, sym=0x7fffe98e1ea0) at grob-property.cc:162
162   SCM val = get_property_data (this, sym);

Reported by Trevor B: https://lists.gnu.org/archive/html/lilypond-user/2020-05/msg00077.html

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