"No set method providing array access" for "LongArray += Int"?

Language Design
1

This code doesn’t compile:

fun test() {
    val array = LongArray(10)
    var long = 0L
    val int = 3

    long += int // OK
    array[0] += int // ! "No set method providing array access" ?
}

The same issue happens with MutableList<Long> and Array<Long>.

2

Thanks for spotting this. We have this issue tracked as https://youtrack.jetbrains.com/issue/KT-19249.

3

This compiler bug was reported two years ago?