namespace A

	class Referer

		def stuff as A.B.C.Container<of String>  # dotted generic name used to confound compiler
			return nil to passthrough

	namespace B

		namespace C

			class Container<of T>

				def add(item as T)
					pass


class Program

	def main is shared
		.foo(nil)
		.foo('aoeu')
		.bar(nil)
		.bar('aoeu')
	
	def foo(s as String?) is shared
		assert s is nil or s == 'aoeu'

	def bar(s as System.String?) is shared  # nilable qualified
		assert s is nil or s == 'aoeu'