Use List instead of Link in the type system.

sdk/lib/_internal/compiler/implementation/util/util.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.
 
 library dart2js.util;
 
 import 'util_implementation.dart';
 import 'characters.dart';
 
 export 'setlet.dart';
@@ skipping 29 matching lines @@
 
 class SpannableAssertionFailure {
   final Spannable node;
   final String message;
   SpannableAssertionFailure(this.node, this.message);
 
   String toString() => 'Assertion failure'
                        '${message != null ? ': $message' : ''}';
 }
 
+bool equalElements(List a, List b) {
+  if (a.length != b.length) return false;
+  for (int index = 0; index < a.length; index++) {
+    if (a[index] != b[index]) {
+      return false;
+    }
+  }
+  return true;
+}
+
 /**
  * File name prefix used to shorten the file name in stack traces printed by
  * [trace].
  */
 String stackTraceFilePrefix = null;
 
 /// Writes the characters of [string] on [buffer].  The characters
 /// are escaped as suitable for JavaScript and JSON.  [buffer] is
 /// anything which supports [:write:] and [:writeCharCode:], for example,
 /// [StringBuffer].  Note that JS supports \xnn and \unnnn whereas JSON only
@@ skipping 86 matching lines @@
   if (isAbstract) builder.addLast('abstract');
   if (isFinal) builder.addLast('final');
   if (isVar) builder.addLast('var');
   if (isConst) builder.addLast('const');
   if (isFactory) builder.addLast('factory');
   if (isExternal) builder.addLast('external');
   StringBuffer buffer = new StringBuffer();
   builder.toLink().printOn(buffer, ', ');
   return buffer.toString();
 }