class Point

	var x as int  # no underscore
	var y as int
	var s as String  # a non-nil reference type

	cue init
		base.init
		.s = ''

	get sum as int
		return .x + .y

class Program

	def main is shared
		p = Point()
		p.x = 2
		p.y = 3
		assert p.x + p.y == 5
		assert p.sum == 5