class Test

	def main is shared
		x as dynamic?
		assert x is nil
		x = nil
		assert x is nil
		x = 5
		assert x
		x = nil
		assert x is nil
		x = 'aoeu'
		assert x
		assert x.length == 4
		x = nil
		assert x is nil

		if x
			.takeDynamic(x)

	def takeDynamic(x as dynamic) is shared
		pass