-- main.mcl --
import "fmt"

# this should be a function as a value, iow a lambda
$square = func($x) {
	$x * $x
}

$num = 4
$out = $square($num)

test fmt.printf("%d * %d is %d", $num, $num, $out) {}
-- OUTPUT --
Vertex: test[4 * 4 is 16]