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 <<array>>: IA = a
    val <<index_0>>: String = ""
    (<this>, <<array>>).set(index = <<index_0>>, value = <<array>>.get(index = <<index_0>>).plus(other = 42))
  }
}