-- main.mcl --
$l1 = ["a", "b", "c",]

$l2 = [$l1, ["hello", "world",],]

test [$l1[0] || "fail",] {}
test [$l1[2] || "fail",] {}
test [$l1[3] || "pass",] {}
test $l2[1] || ["fail",] {}
-- OUTPUT --
Vertex: test[a]
Vertex: test[c]
Vertex: test[pass]
Vertex: test[hello]
Vertex: test[world]
