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object Test {
class A[T] { val op = null }
class B extends A[Any]
class C extends B
def f(o: AnyRef) = o match {
case a: A[_] if(a.op != null) => "with op"
case c: C => "C"
case b: B => "B"
}
def main(args: Array[String]) = {
assert("C" == f(new C))
}
}
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