extension_function_example5.kt

open class Vehicle {
    var make = ""
    var model = ""
}

interface LandVehicle

fun <T> T.cruiseTheBoulevard(): String where T: Vehicle, T: LandVehicle {
    return "cruising the boulevard with my $make $model"
}

class Automobile: Vehicle(), LandVehicle

class Rocket: Vehicle()

fun main(args: Array<String>) {

    val myCar = Automobile()
    myCar.run { make = "Chevrolet"; model = "Bel Air" }
    println("Right now I am: ${myCar.cruiseTheBoulevard()}")

    val myRocket = Rocket()
    myRocket.run { make = "SpaceX"; model = "Starship" }
//    println("Right now I am: ${myRocket.cruiseTheBoulevard()}")  // Compiler error if not commented out!
}