1 import scala.concurrent._

     2 import scala.concurrent.duration._

     3 import ExecutionContext.Implicits.global

     4 import scala.language.postfixOps 

     5 

     6 

     7 

     8 lazy val f = Future {

     9   assert(iterT(200000, (x: Int) => x + 1, 0) == 200000)

    10   assert(iterT(100, (x: BigInt) => x * 2, BigInt(2)) == BigInt("2535301200456458802993406410752"))

    11   assert(iterT(10, (x: String) => x ++ "a", "a") == "aaaaaaaaaaa") 

    12 }

    13 

    14 Await.result(f, 90 second)