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

lib/compiler/implementation/typechecker.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 TypeCheckerTask extends CompilerTask {
   TypeCheckerTask(Compiler compiler) : super(compiler);
   String get name => "Type checker";
 
-  static final bool LOG_FAILURES = false;
+  static const bool LOG_FAILURES = false;
 
   void check(Node tree, TreeElements elements) {
     measure(() {
       Visitor visitor =
           new TypeCheckerVisitor(compiler, elements, compiler.types);
       try {
         tree.accept(visitor);
       } catch (CancelTypeCheckException e) {
         if (LOG_FAILURES) {
           // Do not warn about unimplemented features; log message instead.
@@ skipping 37 matching lines @@
  * A statement type tracks whether a statement returns or may return.
  */
 class StatementType implements Type {
   final String stringName;
   Element get element => null;
 
   SourceString get name => new SourceString(stringName);
 
   const StatementType(this.stringName);
 
-  static final RETURNING = const StatementType('<returning>');
-  static final NOT_RETURNING = const StatementType('<not returning>');
-  static final MAYBE_RETURNING = const StatementType('<maybe returning>');
+  static const RETURNING = const StatementType('<returning>');
+  static const NOT_RETURNING = const StatementType('<not returning>');
+  static const MAYBE_RETURNING = const StatementType('<maybe returning>');
 
   /** Combine the information about two control-flow edges that are joined. */
   StatementType join(StatementType other) {
     return (this === other) ? this : MAYBE_RETURNING;
   }
 
   Type unalias(Compiler compiler) => this;
 
   String toString() => stringName;
 }
@@ skipping 763 matching lines @@
   }
 
   visitCatchBlock(CatchBlock node) {
     return unhandledStatement();
   }
 
   visitTypedef(Typedef node) {
     return unhandledStatement();
   }
 }