'operator' checks

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

@@ -1,7 +1,7 @@
 // !DIAGNOSTICS: -UNUSED_PARAMETER
 
 class C {
-    operator fun compareTo(c: C): Int? = null
+    <!INAPPLICABLE_OPERATOR_MODIFIER!>operator<!> fun compareTo(c: C): Int? = null
 }
 
 fun test(c: C) {

compiler/testData/diagnostics/tests/operatorsOverloading/kt1028.kt

@@ -7,8 +7,8 @@ class event<T>()
 {
     val callbacks = ArrayList< Function1<T, Unit> >() // Should be ArrayList<()->Unit>, bug posted
 
-    operator fun plusAssign(f : (T) -> Unit) = callbacks.add(f)
-    operator fun minusAssign(f : (T) -> Unit) = callbacks.remove(f)
+    <!INAPPLICABLE_OPERATOR_MODIFIER!>operator<!> fun plusAssign(f : (T) -> Unit) = callbacks.add(f)
+    <!INAPPLICABLE_OPERATOR_MODIFIER!>operator<!> fun minusAssign(f : (T) -> Unit) = callbacks.remove(f)
     fun call(value : T) { for(c in callbacks) c(value) }
 }
 
@@ -32,4 +32,4 @@ class Test()
         control.MouseMoved <!ASSIGNMENT_OPERATOR_SHOULD_RETURN_UNIT!>+=<!> { it.X } // here
         control.MouseMoved.plusAssign( { it.X } ) // ok
     }
-}
+}