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