$top = "top-level"
class base($s) {
	test "middle " + $s {}
	$middle = "inside base"
}

# syntactic sugar for the equivalent of defining a class `inner` inside of base.
class base:inner($s) {
	test "inner " + $s {}

	$last = "i am inner and i can see " + $middle
}

include base("world") as b1
include b1.inner("hello") as b2	# inner comes out of `base`

test $top {}
test $b1.middle {}
test $b2.last {}