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tree)
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class A {
val b = new B
def getChildren = List(new A).iterator
class B {
private def check = true
private def getAncestor(p: A): A = {
val c = (p.getChildren.find(_.b.check)) match {case Some(d) => d case None => p}
if (c == p) p else c.b.getAncestor(c)
}
}
}
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