1 

     2 import scala.concurrent._

     3 import scala.concurrent.duration._

     4 import ExecutionContext.Implicits.global

     5 import scala.language.postfixOps 

     6 

     7 

     8 

     9 lazy val f = Future {

    10   assert(simp(ZERO | ONE) == ONE)

    11   assert(simp(STAR(ZERO | ONE)) == STAR(ZERO | ONE))

    12   assert(simp(ONE ~ (ONE ~ (ONE ~ CHAR('a')))) == CHAR('a'))

    13   assert(simp(ONE ~ (ONE ~ (ONE ~ ZERO))) == ZERO)

    14   assert(simp(ALT(ONE ~ (ONE ~ (ONE ~ ZERO)), CHAR('a'))) == CHAR('a'))

    15   assert(simp(CHAR('a') | CHAR('a')) == CHAR('a'))

    16   assert(simp(ONE | CHAR('a')) == (ONE | CHAR('a')))

    17 }

    18 

    19 Await.result(f, 30 second)