kotlin-fork/compiler/testData/codegen/box/increment/extOnLong.kt

// IGNORE_BACKEND: JS_IR
operator fun Long.get(i: Int) = this
operator fun Long.set(i: Int, newValue: Long) {}

fun box(): String {
    var x = 0L
    val y = x[0]++
    return if (y == 0L) "OK" else "Failed, y=$y"
}