Fix compiler tests

idea/testData/checker/ForRangeConventions.kt

@@ -7,64 +7,64 @@ class NotRange1() {
 }
 
 abstract class NotRange2() {
-  abstract fun iterator() : Unit
+  abstract operator fun iterator() : Unit
 }
 
 abstract class ImproperIterator1 {
-  abstract fun hasNext() : Boolean
+  abstract operator fun hasNext() : Boolean
 }
 
 abstract class NotRange3() {
-  abstract fun iterator() : ImproperIterator1
+  abstract operator fun iterator() : ImproperIterator1
 }
 
 abstract class ImproperIterator2 {
-  abstract fun next() : Boolean
+  abstract operator fun next() : Boolean
 }
 
 abstract class NotRange4() {
-  abstract fun iterator() : ImproperIterator2
+  abstract operator fun iterator() : ImproperIterator2
 }
 
 abstract class ImproperIterator3 {
-  abstract fun hasNext() : Int
-  abstract fun next() : Int
+  abstract operator fun hasNext() : Int
+  abstract operator fun next() : Int
 }
 
 abstract class NotRange5() {
-  abstract fun iterator() : ImproperIterator3
+  abstract operator fun iterator() : ImproperIterator3
 }
 
 abstract class AmbiguousHasNextIterator {
-  abstract fun hasNext() : Boolean
+  abstract operator fun hasNext() : Boolean
   val hasNext : Boolean get() = false
-  abstract fun next() : Int
+  abstract operator fun next() : Int
 }
 
 abstract class NotRange6() {
-  abstract fun iterator() : AmbiguousHasNextIterator
+  abstract operator fun iterator() : AmbiguousHasNextIterator
 }
 
 abstract class ImproperIterator4 {
   val hasNext : Int get() = 1
-  abstract fun next() : Int
+  abstract operator fun next() : Int
 }
 
 abstract class NotRange7() {
-  abstract fun iterator() : ImproperIterator3
+  abstract operator fun iterator() : ImproperIterator3
 }
 
 abstract class GoodIterator {
-  abstract fun hasNext() : Boolean
-  abstract fun next() : Int
+  abstract operator fun hasNext() : Boolean
+  abstract operator fun next() : Int
 }
 
 abstract class Range0() {
-  abstract fun iterator() : GoodIterator
+  abstract operator fun iterator() : GoodIterator
 }
 
 abstract class Range1() {
-  abstract fun iterator() : Iterator<Int>
+  abstract operator fun iterator() : Iterator<Int>
 }
 
 fun test(notRange1: NotRange1, notRange2: NotRange2, notRange3: NotRange3, notRange4: NotRange4, notRange5: NotRange5, notRange6: NotRange6, notRange7: NotRange7, range0: Range0, range1: Range1) {