-- main.mcl --
import "fmt"
import "math"

$list = ["a", "b", "c",]

$index = 42 # should be out of scope

for $index, $value in $list {
	$newindex = if math.mod($index, 2) == 0 {
		$index
	} else {
		42
	}
	$s = fmt.printf("%s is %d", $value, $newindex)
	test [$s,] {}
}

-- OUTPUT --
Vertex: test[a is 0]
Vertex: test[b is 42]
Vertex: test[c is 2]