Editing Compilation error on music overflow

When you have multiple overflowing measures, the music flows off the page. This snippet forces an error when this happens by checking the width of each system and checking it against the paper width.

<lilypond version="2.24.0">
scorepaper = \paper { }

#(define staffcount 0)

\relative c' {
  \override Staff.StaffSymbol.after-line-breaking =
    #(lambda (grob)
       (set! staffcount (+ staffcount 1))
       (let* ((staff-width (interval-length (ly:grob-property grob 'X-extent)))
              (staff-space (ly:output-def-lookup scorepaper 'staff-space))
              (paper-width (ly:output-def-lookup scorepaper 'paper-width))
              (my-width (/ paper-width staff-space)))
         (if (> staff-width my-width)
             (ly:error "Music overflows page at staff ~a." staffcount))))
  %% uncomment this and compilation will fail, throwing a music overflow error.
  %r4 
  \repeat unfold 100 { c1 }
}
</lilypond>

[[Category:Scheme]]
[[Category:Paper and layout]]