import Color.*;

fun main() {
    when (RED) {
        RED -> println("red")
        BLUE -> println("blue")
        GREEN -> println("green")
    }

    when ("y") {
        "yes", "y" -> println("Yes")
        else -> println("No")
    }

    val b: A = B()

    when (b) {
        // Smart cast b to the type B
        is B -> println("B")
        else -> println("Unknown")
    }
}

enum class Color {
    BLUE, GREEN, RED
}

open class A

class B : A()