       let queue = waiters
       if CAS(queue, nil, &waiters)
       {
-        // syncprint(syncread(&waiting))
-        // syncprint("Queue tail is \(queue)")
         WaitQueue.notifyAll(queue)
         break
       }
     }
+
     // The result is now available for the world
   }
-
-  // private var waiting: Int32 = 0
 
   private func enqueue(waiter: UnsafeMutablePointer<Waiter>) -> Bool
   {

      {
        if CAS(tail, waiter, &waiters)
        { // waiter is now enqueued
          // OSAtomicIncrement32Barrier(&waiting)
          return true
        }
      }

    }
  }

  // MARK: private methods

  /// Change the state of this `Deferred` from `.Waiting` to `.Executing`
