kotlin-fork/compiler/testData/diagnostics/tests/operatorsOverloading/plusAssignOnArray.kt

// !DIAGNOSTICS: -UNUSED_PARAMETER

class C {
    operator fun get(i: Int): C = this
}

operator fun C.plus(a: Any): C = this
operator fun C.plusAssign(a: Any) {}

class C1 {
    operator fun get(i: Int): C = C()
    operator fun set(i: Int, v: C) {}
}

class C2 {
    operator fun set(i: Int, v: C2) {}
    operator fun get(i: Int): C2 = this
}

operator fun C2.plus(a: Any):C2 = this

fun test() {
    val c = C()
    c[0] += ""
    var c1 = C1()
    c1[0] <!ASSIGN_OPERATOR_AMBIGUITY!>+=<!> ""
    var c2 = C2()
    c2<!NO_SET_METHOD!>[0]<!> += ""
}