Queue work failed

[anbaoyong]

@oleiade when i use Queue's example ,the result is endless loop .
the @code:
var queue *Queue = NewQueue()

// Let's add the incoming clients to the queue
queue.Enqueue("grumpyClient")
queue.Enqueue("happyClient")
queue.Enqueue("ecstaticClient")

fmt.Println(queue.Head) // grumpyClient

// Let's handle the clients asynchronously
for client := queue.Dequeue(); client != nil; {
go fmt.Println(client)
}

[anbaoyong]

it seems that 'queue.Dequeue()' cann't remove the item.