//import scala.concurrent._
//import scala.concurrent.duration._
//import ExecutionContext.Implicits.global
//import scala.language.postfixOps
//import scala.language.reflectiveCalls
//lazy val f = Future {
import CW8b._
assert(sread(Map(), 2) == 0)
assert(sread(Map(2 -> 1), 2) == 1)
assert(write(Map(), 1, 2) == Map(1 -> 2))
assert(write(Map(1 -> 0), 1, 2) == Map(1 -> 2))
//}
//Await.result(f, 120 second)