KT-62138 add testcases

compiler/testData/diagnostics/tests/operatorsOverloading/AssignOperatorWithExtensionForAny.kt

@@ -0,0 +1,25 @@
+// FIR_IDENTICAL
+
+class Y
+class Z
+
+class HashMap<K, V>(
+    private val defaultValue: V
+) {
+    operator fun get(key: K): V = defaultValue
+    operator fun set(key: K, value: V) {}
+}
+
+private operator fun Any.plusAssign(p: Any) { }
+private operator fun Any.plus(p: Any): Any = Any()
+
+class Base {
+    private val x = HashMap<Y, Z>(Z())
+
+    fun foo(): Z {
+        val y = Y()
+        val z = Z()
+        x[y] += z
+        return x[y]
+    }
+}

compiler/testData/diagnostics/tests/operatorsOverloading/plusAssignOnArray.fir.kt

@@ -0,0 +1,29 @@
+// !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[0] += ""
+}

compiler/testData/diagnostics/tests/operatorsOverloading/plusAssignOnArray.kt

@@ -1,4 +1,3 @@
-// FIR_IDENTICAL
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 
 class C {
@@ -13,9 +12,18 @@ class C1 {
     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]<!> += ""
 }

compiler/testData/diagnostics/tests/operatorsOverloading/plusAssignOnArray.txt

@@ -2,6 +2,7 @@ package
 
 public fun test(): kotlin.Unit
 public operator fun C.plus(/*0*/ a: kotlin.Any): C
+public operator fun C2.plus(/*0*/ a: kotlin.Any): C2
 public operator fun C.plusAssign(/*0*/ a: kotlin.Any): kotlin.Unit
 
 public final class C {
@@ -20,3 +21,12 @@ public final class C1 {
     public final operator fun set(/*0*/ i: kotlin.Int, /*1*/ v: C): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
+
+public final class C2 {
+    public constructor C2()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public final operator fun get(/*0*/ i: kotlin.Int): C2
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public final operator fun set(/*0*/ i: kotlin.Int, /*1*/ v: C2): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}