-- main.mcl --
import "fmt"
# this can return changing functions, and could be optimized, too
$funcgen = func($a) {
	if $a {
		func($b) {
			if $b == "hello" {
				func($c1) {
					fmt.printf("true-true-%d", $c1)
				}
			} else {
				func($c2) {
					if $c2 >= 0 {
						fmt.printf("true-false-%d", $c2)
					} else {
						"true-false-negative"
					}
				}
			}
		}
	} else {
		func($b) {
			if $b == "hello" {
				func($c3) {
					if $c3 > 20 {
						"false-true-big"
					} else {
						"false-true-small"
					}
				}
			} else {
				func($c4) { # $c4 is ignored, $b is from parent
					"false-false-some-" + $b
				}
			}
		}
	}
}

$fn1 = $funcgen(true)
$fn2 = $funcgen(false)

$out1 = $fn1("hello")
$out2 = $fn1("world")
$out3 = $fn2("hello")
$out4 = $fn2("world")

test [$out1(10),] {}
test [if true { $out2(20) } else { $out2(-20) },] {}
test [if false { $out2(20) } else { $out2(-20) },] {}
test [$out3(30),] {}
test [$out4(40),] {}
-- OUTPUT --
Vertex: test[true-true-10]
Vertex: test[true-false-20]
Vertex: test[true-false-negative]
Vertex: test[false-true-big]
Vertex: test[false-false-some-world]