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

lib/coreimpl/hash_map_set.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.
 
 // Hash map implementation with open addressing and quadratic probing.
 class HashMapImplementation<K extends Hashable, V> implements HashMap<K, V> {
 
   // The [_keys] list contains the keys inserted in the map.
   // The [_keys] list must be a raw list because it
   // will contain both elements of type K, and the [_DELETED_KEY] of type
@@ skipping 19 matching lines @@
   int _loadLimit;
 
   // The current number of entries in the map. Will never be greater
   // than [_loadLimit].
   int _numberOfEntries;
 
   // The current number of deleted entries in the map.
   int _numberOfDeleted;
 
   // The sentinel when a key is deleted from the map.
-  static final _DeletedKeySentinel _DELETED_KEY = const _DeletedKeySentinel();
+  static const _DeletedKeySentinel _DELETED_KEY = const _DeletedKeySentinel();
 
   // The initial capacity of a hash map.
-  static final int _INITIAL_CAPACITY = 8;  // must be power of 2
+  static const int _INITIAL_CAPACITY = 8;  // must be power of 2
 
   HashMapImplementation() {
     _numberOfEntries = 0;
     _numberOfDeleted = 0;
     _loadLimit = _computeLoadLimit(_INITIAL_CAPACITY);
     _keys = new List(_INITIAL_CAPACITY);
     _values = new List<V>(_INITIAL_CAPACITY);
   }
 
   factory HashMapImplementation.from(Map<K, V> other) {
@@ skipping 391 matching lines @@
 
 /**
  * A singleton sentinel used to represent when a key is deleted from the map.
  * We can't use [: const Object() :] as a sentinel because it would end up
  * canonicalized and then we cannot distinguish the deleted key from the
  * canonicalized [: Object() :].
  */
 class _DeletedKeySentinel {
   const _DeletedKeySentinel();
 }