-- main.mcl --

class c1() {
	$x = "i am x"
}

class c2() {
	include c1 as g1

	#$y = "i am y"
	$z = "i am y and " + $g1.x
}

include c2 as f1

test $f1.z {}		# yep
#test $f1.x {}		# no
test $f1.g1.x {}	# yep

-- OUTPUT --
Vertex: test[i am y and i am x]
Vertex: test[i am x]