kotlin-fork/js/js.translator/testFiles/operatorOverloading/cases/plusAssignNoReassign.kt

package foo

class A() {

    var message = ""
    fun plusAssign(other : A) {
        message = message + "!"
    }

}

fun box() : Boolean {
    var c = A()
    c += A()
    c += A()
    return c.message == "!!"
}