> The after-line-breaking callback appears to be in stable/2.20 from git. > At least in system.cc.
Yes, but it was not called for System specifically until
commit 782f5528e014cc3c7f705298a83f777306541e89
Author: Jean Abou Samra <j...@abou-samra.fr>
Date: Mon Mar 21 21:21:28 2022 +0100
Also call after-line-breaking/before-line-breaking/springs-and-rods on
System
This makes System consistent with other grobs and allows for
customizations and debugging.
which appeared in 2.23.7.
>
> It doesn't work on my version.
>
> Drawing systems...mwe.ly:36:4: In expression (when (eqv? LEFT #) (let #
> #)):
> mwe.ly:36:4: Unbound variable: when
>
> Unless there is a syntax error I don't see.
>
> I tried it in 2.24.3 and it didn't work there either. Same error.
> There might be an extra parens in there, but I don't understand all
> the syntax.
>
> For fun I also tried:
>
> \layout {
> \context {
> \Score
> \override System.after-line-breaking = #dump-col-info
> }
> }
>
> to see if that error would trigger on System.after-line-breaking and
> the error didn't occur on 2.24.3. This implies that the after-line-
> breaking callback is broken for the System object.
Please triple check that you are actually running 2.24.3.
System.after-line-breaking not working hints at a pre-2.23.7 version,
and 'when' being unbound means it's built with Guile 1 as opposed to
Guile 2 or Guile 3, which is impossible in LilyPond 2.24.
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