- Change "static final" to "static const" in the lib/coreimpl/ directory.

lib/coreimpl/date.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.
 
 class DateImplementation implements Date {
   final int millisecondsSinceEpoch;
   final bool isUtc;
 
   factory DateImplementation.fromString(String formattedString) {
     // Read in (a subset of) ISO 8601.
@@ skipping 41 matching lines @@
       if (millisecondsSinceEpoch === null) {
         throw new IllegalArgumentException(formattedString);
       }
       if (addOneMillisecond) millisecondsSinceEpoch++;
       return new Date.fromMillisecondsSinceEpoch(millisecondsSinceEpoch, isUtc);
     } else {
       throw new IllegalArgumentException(formattedString);
     }
   }
 
-  static final int _MAX_MILLISECONDS_SINCE_EPOCH = 8640000000000000;
+  static const int _MAX_MILLISECONDS_SINCE_EPOCH = 8640000000000000;
 
   DateImplementation.fromMillisecondsSinceEpoch(this.millisecondsSinceEpoch,
                                                 [this.isUtc = false]) {
     if (millisecondsSinceEpoch.abs() > _MAX_MILLISECONDS_SINCE_EPOCH) {
       throw new IllegalArgumentException(millisecondsSinceEpoch);
     }
     if (isUtc === null) throw new IllegalArgumentException(isUtc);
   }
 
   bool operator ==(other) {
@@ skipping 102 matching lines @@
   external Duration get timeZoneOffset();
   external int get year();
   external int get month();
   external int get day();
   external int get hour();
   external int get minute();
   external int get second();
   external int get millisecond();
   external int get weekday();
 }