class Try(private val block: () -> Unit,
          private val catchHandler: ((Exception) -> Unit)?)
      : () -> Unit {

   constructor(block: () -> Unit): this(block, null) {}

   fun whenThrown(catchHandler: (Exception) -> Unit): Try {
       return Try(this, catchHandler)
   }

   override operator fun invoke() {
       try {
           block.invoke()
       } catch (e: Exception) {
           val handler = catchHandler ?: throw e
           handler(e)
       }
   }

}


fun main(args: Array<String>) {
    Try {
        println("one")
        throw RuntimeException("oops")
    }.whenThrown { e ->
        println("two got error $e")
        throw IllegalStateException("nope")
    }.whenThrown { e ->
        println("three got error $e")
        throw IllegalArgumentException("neither")
    }.invoke()
}