test rename overhaul: step 8 - language tests

tests/language/operator2_negative_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Operator dart test program (=== cannot have an operator function).
 
 class Helper {
   int i;
   Helper(int val) : i = val { }
   operator ===(int index) {
     return index;
   }
 }
 
 class Operator2NegativeTest {
   static testMain() {
     Helper obj = new Helper(10);
   }
 }
 
 main() {
   Operator2NegativeTest.testMain();
 }