interface IA {
  abstract operator fun get(index: String): Int

}

interface IB {
  abstract operator fun IA.set(index: String, value: Int)

}

fun IB.test(a: IA) {
  { // BLOCK
    val tmp_0: IA = a
    val tmp_1: String = ""
    (<this>, tmp_0).set(index = tmp_1, value = tmp_0.get(index = tmp_1).plus(other = 42))
  }
}