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trait That1[A]
trait That2[A, R <: That2[A, R]]
trait T[A, This >: Null <: That1[A] with T[A, This]] extends That2[A, This] {
self: This =>
private var next: This = _
def isEmpty = next eq null
def length: Int = {
def loop(x: This, cnt: Int): Int = if (x.isEmpty) cnt else loop(x.next, cnt + 1)
loop(self, 0)
}
}
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