Fix tests: "infix modifier required" and "operator modifier required" errors

compiler/testData/codegen/box/classes/kt1891.kt

@@ -1,9 +1,9 @@
 class MyList<T>() {
     var value: T? = null
 
-    fun get(index: Int): T = value!!
+    operator fun get(index: Int): T = value!!
 
-    fun set(index: Int, value: T) { this.value = value }
+    operator fun set(index: Int, value: T) { this.value = value }
 }
 
 fun box(): String {

compiler/testData/codegen/box/classes/kt2711.kt

@@ -1,9 +1,9 @@
 class IntRange {
-    fun contains(a: Int) = (1..2).contains(a)
+    operator fun contains(a: Int) = (1..2).contains(a)
 }
 
 class C() {
-    fun rangeTo(i: Int) = IntRange()
+    operator fun rangeTo(i: Int) = IntRange()
 }
 
 

compiler/testData/codegen/box/classes/kt504.kt

@@ -1,7 +1,7 @@
 import java.util.HashMap
 import java.io.*
 
-fun <K, V> MutableMap<K, V>.set(key : K, value : V) = put(key, value)
+operator fun <K, V> MutableMap<K, V>.set(key : K, value : V) = put(key, value)
 
 fun box() : String {
 

compiler/testData/codegen/box/classes/kt723.kt

@@ -1,4 +1,4 @@
-fun Int?.inc() : Int { if (this != null) return this.inc() else throw NullPointerException() }
+operator fun Int?.inc() : Int { if (this != null) return this.inc() else throw NullPointerException() }
 
 public fun box() : String {
     var i : Int? = 10

compiler/testData/codegen/box/classes/kt725.kt

@@ -1,4 +1,4 @@
-fun Int?.inc() = this!!.inc()
+operator fun Int?.inc() = this!!.inc()
 
 public fun box() : String {
     var i : Int? = 10

compiler/testData/codegen/box/classes/kt903.kt

@@ -1,6 +1,6 @@
 import java.util.ArrayList
 
-fun Int.plus(a: Int?) = this + a!!
+operator fun Int.plus(a: Int?) = this + a!!
 
 public open class PerfectNumberFinder() {
         open public fun isPerfect(number : Int) : Boolean {

compiler/testData/codegen/box/classes/overloadBinaryOperator.kt

@@ -7,7 +7,7 @@ class ArrayWrapper<T>() {
        contents.add(item)
     }
 
-    fun plus(b: ArrayWrapper<T>): ArrayWrapper<T> {
+    operator fun plus(b: ArrayWrapper<T>): ArrayWrapper<T> {
         val result = ArrayWrapper<T>()
         result.contents.addAll(contents)
         result.contents.addAll(b.contents)

compiler/testData/codegen/box/classes/overloadPlusAssign.kt

@@ -7,11 +7,11 @@ class ArrayWrapper<T>() {
         contents.add(item)
     }
 
-    fun plusAssign(rhs: ArrayWrapper<T>) {
+    operator fun plusAssign(rhs: ArrayWrapper<T>) {
         contents.addAll(rhs.contents)
     }
 
-    fun get(index: Int): T {
+    operator fun get(index: Int): T {
         return contents.get(index)!!
     }
 }

compiler/testData/codegen/box/classes/overloadPlusAssignReturn.kt

@@ -7,14 +7,14 @@ class ArrayWrapper<T>() {
         contents.add(item)
     }
 
-    fun plus(rhs: ArrayWrapper<T>): ArrayWrapper<T> {
+    operator fun plus(rhs: ArrayWrapper<T>): ArrayWrapper<T> {
         val result = ArrayWrapper<T>()
         result.contents.addAll(contents)
         result.contents.addAll(rhs.contents)
         return result
     }
 
-    fun get(index: Int): T {
+    operator fun get(index: Int): T {
         return contents.get(index)!!
     }
 }

compiler/testData/codegen/box/classes/overloadPlusToPlusAssign.kt

@@ -7,14 +7,14 @@ class ArrayWrapper<T>() {
         contents.add(item)
     }
 
-    fun plus(rhs: ArrayWrapper<T>): ArrayWrapper<T> {
+    operator fun plus(rhs: ArrayWrapper<T>): ArrayWrapper<T> {
         val result = ArrayWrapper<T>()
         result.contents.addAll(contents)
         result.contents.addAll(rhs.contents)
         return result
     }
 
-    fun get(index: Int): T {
+    operator fun get(index: Int): T {
         return contents.get(index)!!
     }
 }

compiler/testData/codegen/box/classes/overloadUnaryOperator.kt

@@ -7,14 +7,14 @@ class ArrayWrapper<T>() {
        contents.add(item)
     }
 
-    fun minus(): ArrayWrapper<T> {
+    operator fun unaryMinus(): ArrayWrapper<T> {
         val result = ArrayWrapper<T>()
         result.contents.addAll(contents)
         Collections.reverse(result.contents)
         return result
     }
 
-    fun get(index: Int): T {
+    operator fun get(index: Int): T {
         return contents.get(index)!!
     }
 }