1 

     2 import scala.concurrent._

     3 import scala.concurrent.duration._

     4 import ExecutionContext.Implicits.global

     5 import scala.language.postfixOps 

     6 import scala.language.reflectiveCalls

     7 

     8 lazy val f = Future {

     9   import CW8a._

    10 

    11   val EVIL_urban = SEQ(STAR(STAR(CHAR('a'))), CHAR('b'))

    12 

    13   assert(size(der('a', der('a', EVIL_urban))) == 28)

    14   assert(size(der('a', der('a', der('a', EVIL_urban)))) == 58)

    15 

    16   assert(size(ders("aaaaaa".toList, EVIL_urban)) == 8)

    17 }

    18 

    19 Await.result(f, 120 second)