File: t4285.check

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scala 2.11.12-6
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scala> val x = Array(1,2,3,4,5,6,7)
x: Array[Int] = Array(1, 2, 3, 4, 5, 6, 7)

scala> val y = x transform (_ * 2)
y: scala.collection.mutable.WrappedArray[Int] = WrappedArray(2, 4, 6, 8, 10, 12, 14)

scala> println(y.sum)
56

scala> :quit