Address long-standing review comments.

tests/language/closure_in_initializer_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.
 
+// Test that a parameter used in two different closures defined in a
+// constructor initializer, is properly boxed.
+
 import "package:expect/expect.dart";
 
 class A {
   var f;
   var g;
   A(a) : f = (() => 42 + a), g = (() => ++a) {
     a = 4;
   }
 }
 
@@ skipping 20 matching lines @@
   a = new C(0);
   Expect.equals(46, a.f());
   Expect.equals(5, a.g());
   Expect.equals(47, a.f());
   Expect.equals(1, a.h());
   Expect.equals(2, a.h());
   Expect.equals(47, a.f());
   Expect.equals(6, a.g());
   Expect.equals(48, a.f());
 }