Line 222 in Iterator.scala should be:

def take(n: Int): Iterator[A] = new Iterator[A] {

Otherwise the type returned by take makes it hard to subclass Iterator:

scala> val it: Iterator[Int] = Array(1, 2, 3, 4, 5).elements
val it: Iterator[Int] = Array(1, 2, 3, 4, 5).elements
it: Iterator[Int] = non-empty iterator

scala> it.take(3)
it.take(3)
res8: java.lang.Object with Iterator[Int]{def remaining: Int; def remaining_=(Int): Unit} = non-empty iterator