SimpleQueue(e1, e2, ..., en)
type(e::anything, 'Queue')
q:-enqueue(e::anything)
q:-dequeue()
q:-empty()
q:-front()
q:-length()
q:-clear()
$include <Queue.mi>
Enqueue(q::Queue, e::anything)::anything
Dequeue(q::Queue)::anything
Front(q::Queue)::anything
EmptyP(q::Queue)::anything