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// tested using Scala compiler version 2.4.0-RC1 -- (c) 2002-2011 LAMP/EPFL
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// Many thanks to all at LAMP for the work that goes into Scala.
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trait B[T <: B[T]] { self: T => }
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abstract class C extends A with B[C]
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protected val data: List[Int]
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abstract class D extends C with B[D] {}