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 tmp0_array: IA = a
    val tmp1_index0: String = ""
    (<this>, tmp0_array).set(index = tmp1_index0, value = tmp0_array.get(index = tmp1_index0).plus(other = 42))
  }
}