File: t3822.scala

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scala 2.11.12-4
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import scala.collection.{ mutable, immutable, generic }
import immutable.ListSet

object Test {
  def main(args: Array[String]): Unit = {
    val xs = ListSet(-100000 to 100001: _*)

    assert(xs.size == 200002)
    assert(xs.sum == 100001)

    val ys = ListSet[Int]()
    val ys1 = (1 to 12).grouped(3).foldLeft(ys)(_ ++ _)
    val ys2 = (1 to 12).foldLeft(ys)(_ + _)

    assert(ys1 == ys2)
  }
}