2.23.5 and poly-mark-engraver https://lsr.di.unimi.it/LSR/Item?id=976

[Joel C. Salomon]

I'm returning to an old project (last touched in 2016) on a new 
computer, and I’m running 2.23.5 on Windows 11.

Several of the scores used poly-mark-engraver from 
<https://lsr.di.unimi.it/LSR/Item?id=976> (see also 
<https://lists.gnu.org/archive/html/lilypond-user/2011-08/msg00157.html>), 
and this now fails with

> fatal error: cannot find music object: MarkEvent

(Minimal example below signature; the demonstration included in 
<https://lsr.di.unimi.it/LSR/Snippet?id=976> also fails the same way.)

This is both a bug-report if anyone’s maintaining the snippet, and a 
question whether there’s now a better way to write da capo, al segno, 
and other coda-like repeats.

—Joel C. Salomon

    \version "2.23.5"
    \language "english"

    \include "poly-mark-engraver.ly" % 
http://lsr.di.unimi.it/LSR/Item?id=976

    \score {
      \new PianoStaff
      <<
        \new Staff = "upper" \relative c'' { c c c c | }
        \new Dynamics = "dynamics" {
          s4*4
          \polyMark #'DCFine \markup \italic "Segue"
          \bar "|."
        }
        \new Staff = "lower" \relative c { \clef bass c c c c | }
      >>
    }

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