anchor.diff:      database.get(key) match {
         case None =>
           log.debug("get %s: miss", key)
  -        Future.exception(new BirdNameException("No such key"))
  +        Future.exception(BirdNameException("No such key"))
         case Some(value) =>
           log.debug("get %s: hit", key)
           Future(value)
  
positive.code: package com.twitter.birdname
  
  import com.twitter.logging.Logger
  import com.twitter.util._
  import java.util.concurrent.Executors
  
negative.code:     database(key) = value
      Future.Unit
    }
  
    def shutdown() = {
      super.shutdown(0.seconds)
    }
  }
  