class A

	var _value = 1
	
	pro value from var


class B

	def foo(a as out A?)
		a = A()
		.bar(a to !)

	def bar(a as A)
		assert a.value
		a.value = 2

	def main is shared
		a as A?
		B().foo(out a)
		assert a.value == 2