test rename overhaul: step 8 - language tests

tests/language/is_not_class4_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.
 // Dart test program to test that the parser emits an error when
 // two 'is' expressions follow each other.
 
 class A {
   const A();
 }
 
 class IsNotClass4NegativeTest {
   static testMain() {
     var a = new A();
 
     if (a is A is A) {
       return 0;
     }
     return 0;
   }
 }
 
 main() {
   IsNotClass4NegativeTest.testMain();
 }