DSL for C#-style using statement

using.kt

trait Disposable {
    fun dispose()
}

fun using(value : Disposable, body : ()->Unit) {
    try {
        body()
    } finally {
        value.dispose()
    }
}

fun fn() {
    val resource = object : Disposable {
        override fun dispose() {
            println("disposed!")
        }

    }

    using(resource) {
        println("using resource")
    }
}