Fix compiler tests

compiler/testData/diagnostics/tests/extensions/ExtensionFunctions.kt

@@ -16,7 +16,7 @@ fun <T: Any, E> T.foo(<!UNUSED_PARAMETER!>x<!> : E, y : A) : T   {
 
 class A
 
-fun A.plus(<!UNUSED_PARAMETER!>a<!> : Any) {
+operator fun A.plus(<!UNUSED_PARAMETER!>a<!> : Any) {
 
   1.foo()
   true.<!TYPE_INFERENCE_NO_INFORMATION_FOR_PARAMETER!>foo<!>(<!NO_VALUE_FOR_PARAMETER, NO_VALUE_FOR_PARAMETER!>)<!>
@@ -24,11 +24,11 @@ fun A.plus(<!UNUSED_PARAMETER!>a<!> : Any) {
   <!UNUSED_EXPRESSION!>1<!>
 }
 
-fun A.plus(<!UNUSED_PARAMETER!>a<!> : Int) {
+operator fun A.plus(<!UNUSED_PARAMETER!>a<!> : Int) {
   <!UNUSED_EXPRESSION!>1<!>
 }
 
-fun <T> T.minus(<!UNUSED_PARAMETER!>t<!> : T) : Int = 1
+operator fun <T> T.minus(<!UNUSED_PARAMETER!>t<!> : T) : Int = 1
 
 fun test() {
   val <!UNUSED_VARIABLE!>y<!> = 1.abs

compiler/testData/diagnostics/tests/extensions/ExtensionFunctions.txt

@@ -23,10 +23,10 @@ package outer {
     public fun test(): kotlin.Unit
     public fun </*0*/ T : kotlin.Any, /*1*/ E> T.foo(/*0*/ x: E, /*1*/ y: outer.A): T
     public fun kotlin.Int.foo(): kotlin.Int
-    public fun </*0*/ T> T.minus(/*0*/ t: T): kotlin.Int
+    public operator fun </*0*/ T> T.minus(/*0*/ t: T): kotlin.Int
     public fun kotlin.Int?.optint(): kotlin.Unit
-    public fun outer.A.plus(/*0*/ a: kotlin.Any): kotlin.Unit
-    public fun outer.A.plus(/*0*/ a: kotlin.Int): kotlin.Unit
+    public operator fun outer.A.plus(/*0*/ a: kotlin.Any): kotlin.Unit
+    public operator fun outer.A.plus(/*0*/ a: kotlin.Int): kotlin.Unit
 
     public final class A {
         public constructor A()

compiler/testData/diagnostics/tests/extensions/GenericIterator.kt

@@ -8,12 +8,12 @@ fun <T> java.util.Enumeration<T>.iterator() = object: Iterator<T> {
 
 interface MyIterator<T> {
 
-  fun hasNext() : Boolean
+  operator fun hasNext() : Boolean
 
-  fun next() : T
+  operator fun next() : T
 }
 
-fun <T : Any> T?.iterator() = object : MyIterator<T> {
+operator fun <T : Any> T?.iterator() = object : MyIterator<T> {
     var hasNext = this@iterator != null
       private set
     override fun hasNext() = hasNext

compiler/testData/diagnostics/tests/extensions/GenericIterator.txt

@@ -1,13 +1,13 @@
 package
 
 public fun main(/*0*/ args: kotlin.Array<kotlin.String>): kotlin.Unit
-public fun </*0*/ T : kotlin.Any> T?.iterator(): MyIterator<T>
+public operator fun </*0*/ T : kotlin.Any> T?.iterator(): MyIterator<T>
 public fun </*0*/ T> java.util.Enumeration<T>.iterator(): kotlin.Iterator<T>
 
 public interface MyIterator</*0*/ T> {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
-    public abstract fun hasNext(): kotlin.Boolean
+    public abstract operator fun hasNext(): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
-    public abstract fun next(): T
+    public abstract operator fun next(): T
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }

compiler/testData/diagnostics/tests/extensions/GenericIterator2.kt

@@ -2,7 +2,7 @@
 
 import java.util.Enumeration
 
-fun <T> java.util.Enumeration<T>.iterator() = object : Iterator<T> {
+operator fun <T> java.util.Enumeration<T>.iterator() = object : Iterator<T> {
   public override fun hasNext(): Boolean = hasMoreElements()
 
   public override fun next() = nextElement()

compiler/testData/diagnostics/tests/extensions/GenericIterator2.txt

@@ -1,4 +1,4 @@
 package
 
 public fun a(/*0*/ e: java.util.Enumeration<kotlin.Int>): kotlin.Unit
-public fun </*0*/ T> java.util.Enumeration<T>.iterator(): kotlin.Iterator<T>
+public operator fun </*0*/ T> java.util.Enumeration<T>.iterator(): kotlin.Iterator<T>

compiler/testData/diagnostics/tests/extensions/throwOutCandidatesByReceiver2.kt

@@ -9,6 +9,6 @@ fun test(a1: A, a2: A) {
 }
 
 
-public fun <T: Comparable<T>> T.rangeTo(<!UNUSED_PARAMETER!>that<!>: T): Range<T> {
+public operator fun <T: Comparable<T>> T.rangeTo(<!UNUSED_PARAMETER!>that<!>: T): Range<T> {
     throw UnsupportedOperationException()
 }

compiler/testData/diagnostics/tests/extensions/throwOutCandidatesByReceiver2.txt

@@ -2,7 +2,7 @@ package
 
 package a {
     public fun test(/*0*/ a1: a.A, /*1*/ a2: a.A): kotlin.Unit
-    public fun </*0*/ T : kotlin.Comparable<T>> T.rangeTo(/*0*/ that: T): kotlin.Range<T>
+    public operator fun </*0*/ T : kotlin.Comparable<T>> T.rangeTo(/*0*/ that: T): kotlin.Range<T>
 
     public final class A {
         public constructor A()