File: t4431.check

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t4431.scala:5: error: class BB needs to be abstract, since there is a deferred declaration of method f which is not implemented in a subclass
  class BB extends B { def f (): Unit }
        ^
t4431.scala:8: error: trait cannot redefine final method from class AnyRef
  trait C { def wait (): Unit }
                ^
two errors found