Migrate block 116.

tests/language_2/identical_closure_test.dart

 // Copyright (c) 2012, 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.
 
 import "package:expect/expect.dart";
 
 var myIdentical = identical;
 
 class Point {
   num x, y;
@@ skipping 24 matching lines @@
   // Strings.
   var a = "hello";
   var b = "hello";
   // Identical strings are coalesced into single instances.
   Expect.isTrue(myIdentical(a, b));
 
   // Null handling.
   Expect.isFalse(myIdentical(42, null));
   Expect.isTrue(myIdentical(null, null));
 }