which is hanging over a bar line is not proper, such as
@lilypond[quote,ragged-right,relative=2,fragment,verbatim]
-c4 c2 c2 \break % this does nothing
+c4 c2 << c2 {s4 \break } >> % this does nothing
c2 c4 | % a break here would work
c4 c2 c4 ~ \break % as does this break
c4 c2 c4
@end lilypond
-This can be avoided by removing the @code{Forbid_line_break_engraver}
-and adding the line breaks in another voice:
+This can be avoided by removing the @code{Forbid_line_break_engraver}.
+Note that manually forced line breaks have to be added in parallel
+with the music.
@lilypond[quote,ragged-right,verbatim]
-\new Staff <<
- \new Voice \with {
- \remove Forbid_line_break_engraver
- } {
- c'4 c'2 c'2 c'2 c'4
- }
- \new Voice {
- s1 \break s1
- }
->>
+\new Voice \with {
+ \remove Forbid_line_break_engraver
+} {
+ c4 c2 << c2 {s4 \break } >> % now the break is allowed
+ c2 c4
+}
@end lilypond