fun String.k(): Function0<String> {
  return local fun <anonymous>(): String {
    return <this>
  }

}

fun test1(f: Function0<Unit>) {
  return f.invoke()
}

fun test2(f: @ExtensionFunctionType Function1<String, Unit>) {
  return f.invoke(p1 = "hello")
}

fun test3(): String {
  return "hello".k().invoke()
}

fun test4(ns: String?): String? {
  return { // BLOCK
    val tmp_0: Function0<String>? = { // BLOCK
      val tmp_1: String? = ns
      when {
        EQEQ(arg0 = tmp_1, arg1 = null) -> null
        else -> tmp_1.k()
      }
    }
    when {
      EQEQ(arg0 = tmp_0, arg1 = null) -> null
      else -> tmp_0.invoke()
    }
  }
}