breakbefore

[Graham Percival]

Is the correct way to use breakbefore?  If so, I'd like to report
a bug in 2.5.30 (it has no effect).

\version "2.5.30"
\book{
  \score{
    \relative c'' { c4 }
  }
  \score{
    \header{ breakbefore = ##t }
    \relative c'' { c4 }
  }
}