     var val: Int32 = 0
 
     for (var i = 0; i < 100; ++i) {
-      queue.queueBlock({ OSAtomicIncrement32(&val); return })
+      queue.queueBlock({ OSAtomicIncrement32(&val) })
     }
     queue.queueAndAwaitBarrierBlock({})
     XCTAssertEqual(val, 100)

    var notifyVal: Int32 = 0

    for (var i = 0; i < 100; ++i) {
      queue.queueBlock({ OSAtomicIncrement32(&val); return }, inGroup: group)
    }
    
    queue.queueNotifyBlock({

    let queue = GCDQueue.concurrentQueue()
    var val: Int32 = 0
    
    queue.queueAndAwaitBlock({ _ in OSAtomicIncrement32(&val) }, iterationCount: 100)

    XCTAssertEqual(val, 100)
  }
