$top = "top-level"
class base($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,] {}