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object Main extends App {
  import collection.Parallelizable
  import collection.parallel.{ParIterable, ForkJoinTaskSupport}
  def parN[S, T[S] <: Parallelizable[S, ParIterable[S]]](collection: T[S], n: Int) = {
    val parCollection = collection.par
    parCollection.tasksupport = new ForkJoinTaskSupport(
      new concurrent.forkjoin.ForkJoinPool(n))
    parCollection
  }
  println(parN(Array(1, 2, 3), 2))
}

Main.scala:10: error: inferred type arguments [Int,Array] do not conform to method parN's type parameter bounds [S,T[S] <: scala.collection.Parallelizable[S,scala.collection.parallel.ParIterable[S]]]
  println(parN(Array(1, 2, 3), 2))
          ^
one error found
spoj: The program compiled successfully, but Main.class was not found.
      Class Main should contain method: def main(args: Array[String]).

Standard output is empty