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

lib/compiler/implementation/colors.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.
 
 #library('colors');
 
-final String GREEN_COLOR = '\u001b[32m';
-final String RED_COLOR = '\u001b[31m';
-final String MAGENTA_COLOR = '\u001b[35m';
-final String NO_COLOR = '\u001b[0m';
+const String GREEN_COLOR = '\u001b[32m';
+const String RED_COLOR = '\u001b[31m';
+const String MAGENTA_COLOR = '\u001b[35m';
+const String NO_COLOR = '\u001b[0m';
 
 String wrap(String string, String color) => "${color}$string${NO_COLOR}";
 String green(String string) => wrap(string, GREEN_COLOR);
 String red(String string) => wrap(string, RED_COLOR);
 String magenta(String string) => wrap(string, MAGENTA_COLOR);