-- main.mcl --
$x = "i am x"	# i am top-level

class c2() {
	$y = "i am y and " + $x

	#$x = $x	# might be allowed, i don't _really_ care, but i prefer not

	# We need to be able to re-define our new $x that shadows the parent $x,
	# but it should be able to incorporate the parent (top-level) $x into
	# the new value that this new $x here becomes.
	# XXX: not supported for now: could not set scope: not a dag
	# Sam suggested the RHS $x should have a special keyword to make it
	# refer to the parent scope. I suggested when $x is also on the LHS,
	# then this magic keyword should be implied. And only possible in the
	# case for variables on the RHS that are the same var as on the LHS.
	#$x = $x + " and this is shadowed"	# this is important
}

include c2 as f1

test $x {}
test $f1.y {}

# the really tricky case
# XXX: not supported for now: could not set scope: not a dag
#test $f1.x {}

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