-- main.mcl --
$funcgen = func() {
	func($b) {
		"hello" + " " + "world"
	}
}

$some_bool = false
$fn = if $some_bool {
	$funcgen()
} else {
	func($bb) {
		if $bb == "james" {
			"hello purpleidea"
		} else {
			if $bb == "" {
				"who is there?"
			} else {
				"hello " + $bb
			}
		}
	}
}

$out1 = $fn("user")
$out2 = $fn("james")
$out3 = $fn("")

test "${out1}" {}
test "${out2}" {}
test "${out3}" {}
-- OUTPUT --
Vertex: test[hello purpleidea]
Vertex: test[hello user]
Vertex: test[who is there?]