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object Test {
def mkIterator = (1 to 5).iterator map (x => { println(x) ; x })
def mkInfinite = Iterator continually { println(1) ; 1 }
def main(args: Array[String]): Unit = {
// Stream is strict in its head so we should see 1 from each of them.
val s1 = mkIterator.toStream
val s2 = mkInfinite.toStream
// back and forth without slipping into nontermination.
println((Stream from 1).toIterator.drop(10).toStream.drop(10).toIterator.next)
()
}
}
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