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object Test {
def main(args: Array[String]) {
val it = Iterator.from(1).map(n => n * n).scanLeft(0)(_+_)
assert(it.next == 0)
assert(it.next == 1)
assert(it.next == 5)
assert(it.next == 14)
assert(it.next == 30)
assert(it.next == 55)
assert(it.next == 91)
assert(it.next == 140)
assert(it.next == 204)
assert(it.next == 285)
assert(it.next == 385)
}
}
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