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

lib/compiler/implementation/scanner/scanner_task.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 ScannerTask extends CompilerTask {
   ScannerTask(Compiler compiler) : super(compiler);
   String get name => 'Scanner';
 
   void scanLibrary(LibraryElement library) {
     var compilationUnit = library.entryCompilationUnit;
@@ skipping 204 matching lines @@
       parser.parseUnit(tokens);
     });
   }
 }
 
 /**
  * The fields of this class models a state machine for checking script
  * tags come in the correct order.
  */
 class TagState {
-  static final int NO_TAG_SEEN = 0;
-  static final int LIBRARY = 1;
-  static final int IMPORT = 2;
-  static final int SOURCE = 3;
-  static final int RESOURCE = 4;
+  static const int NO_TAG_SEEN = 0;
+  static const int LIBRARY = 1;
+  static const int IMPORT = 2;
+  static const int SOURCE = 3;
+  static const int RESOURCE = 4;
 
   /** Next state. */
-  static final List<int> NEXT =
+  static const List<int> NEXT =
       const <int>[NO_TAG_SEEN,
                   IMPORT, // Only one library tag is allowed.
                   IMPORT,
                   SOURCE,
                   RESOURCE];
 }