Big merge from experimental to bleeding edge.

samples/third_party/todomvc/web/model.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 model;
 
 class ViewModel {
   bool isVisible(Todo todo) => todo != null &&
       ((showIncomplete && !todo.done) || (showDone && todo.done));
 
@@ skipping 23 matching lines @@
 
   int get doneCount {
     int res = 0;
     todos.forEach((t) { if (t.done) res++; });
     return res;
   }
 
   int get remaining => todos.length - doneCount;
 
   void clearDone() {
-    todos = todos.filter((t) => !t.done);
+    todos = todos.where((t) => !t.done).toList();
   }
 }
 
 final AppModel app = new AppModel();
 
 class Todo {
   String task;
   bool done = false;
 
   Todo(this.task);
 
   String toString() => "$task ${done ? '(done)' : '(not done)'}";
 }