There are two things you have to add to your example (I don't know to which extent this is written or missing in the documentation:
1)
an invisible barline \bar ""
LilyPond can only break lines at barlines, so in order to have it break in mid-measure (as one of the staves will do) you can place an invisible barline at all positions where you want to allow LilyPond to add a line break
2)
\override Beam.breakable = ##t
(this can be set in the \Score part of the \layout block)
By default LilyPond can't break when a beam is active, so you have to explicitly allow it to do so.
HTH
Urs


Am 30.03.2015 um 00:46 schrieb 胡雨軒:
​ Hello again :-)

https://github.com/piotr2b/rain-tree-sketch/tree/master/Troubles/Polymetric%20music%20and%20line%20break
​ I've tried to write the long bar 40 in polymetric ​style, as shown 
in the previous link. Unfortunately, although it seems to be a very 
minimal working example inspired by this doc paragraph 
<http://www.lilypond.org/doc/v2.19/Documentation/notation/displaying-rhythms#polymetric-notation>, 
Line breaks aren't done correctly.
Should we have to do something else that is not written down in the 
doc? It yes, where can I ask to modify it / report an insufficiency? I 
believe it's not a bug~
​ Cheers ;-)

胡雨軒​


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