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

lib/compiler/implementation/tree/prettyprint.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.
 
 /**
  * Pretty-prints Node tree in XML-like format.
  *
  * TODO(smok): Add main() to run from command-line to print out tree for given
  * .dart file.
  */
 class PrettyPrinter implements Visitor {
 
   /** String used to represent one level of indent. */
-  static final String INDENT = "  ";
+  static const String INDENT = "  ";
 
   StringBuffer sb;
   int depth;
   /** Prefix for the type passed to the next [openNode()] call. */
   String nextTypePrefix;
   /** Nodes that were opened with [openNode()] calls. */
   Link<String> currentNodeTypes;
 
   PrettyPrinter() :
       sb = new StringBuffer(),
@@ skipping 369 matching lines @@
     visitWithPrefix(node.type, "type:");
     visitWithPrefix(node.modifiers, "modifiers:");
     visitWithPrefix(node.definitions, "definitions:");
     closeNode();
   }
 
   visitWhile(While node) {
     visitNodeWithChildren(node, "While");
   }
 }