def urbanmain() = {

  import M5a._


  import scala.concurrent._
  import scala.concurrent.duration._
  import ExecutionContext.Implicits.global
  import scala.language.postfixOps 

  lazy val f = Future {

    assert(run("[-]", Map(0 -> 100)) == Map(0 -> 0))
    assert(run("[->+<]", Map(0 -> 10)) == Map(0 -> 0, 1 -> 10))
    assert(run("[>>+>>+<<<<-]", Map(0 -> 42)) == Map(0 -> 0, 2 -> 42, 4 -> 42))


    val hw_urban = """+++++[->++++++++++<]>--<+++[->>++++++++++
                  <<]>>++<<----------[+>.>.<+<]"""
    assert(run(hw_urban) == Map(0 -> 0, 1 -> 58, 2 -> 32))

    val hw_urban1 = """++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.
                   +++++++..+++.>>.<-.<.+++.------.--------.>>+.>++."""

    assert(run(hw_urban1) == Map(0 -> 0, 5 -> 33, 1 -> 0, 6 -> 10, 2 -> 72, 3 -> 100, 4 -> 87))

  }

  Await.result(f, 32 second)
}