class Test

	def main
		is shared

		s as Stack<of String> = Stack<of String>()
		assert s.count == 0
		s.push('a')
		s.push('b')
		assert s.pop == 'b'
		assert s.pop == 'a'
		assert not s.count

		q as Queue<of decimal> = Queue<of decimal>()
		q.enqueue(1.0)
		q.enqueue(2)
		assert q.dequeue == 1.0
		assert q.dequeue == 2