-- main.mcl --
import "fmt"

$map1 = {0 => "a", 1 => "b", 2 => "c",}
$map2 = {0 => "x", 1 => "y", 2 => "z",}

$word = "hello"

class foo($x, $y) {
	$result = "hello " + $x + $y
}

forkv $key1, $val1 in $map1 {
	forkv $key2, $val2 in $map2 {

		include foo($val1, $val2) as included

		$s = fmt.printf("%s is {%d,%d}", $included.result, $key1, $key2)
		test [$s,] {}
	}
}

-- OUTPUT --
Vertex: test[hello ax is {0,0}]
Vertex: test[hello ay is {0,1}]
Vertex: test[hello az is {0,2}]
Vertex: test[hello bx is {1,0}]
Vertex: test[hello by is {1,1}]
Vertex: test[hello bz is {1,2}]
Vertex: test[hello cx is {2,0}]
Vertex: test[hello cy is {2,1}]
Vertex: test[hello cz is {2,2}]