anchor.diff:  
   // An implementation of ServerController that fetches items from
   // the server over HTTP.
  +@NgInjectableService()
   class HttpServerController implements ServerController {
     final Http _http;
     HttpServerController(this._http);
  
positive.code: 
  
  // An implementation of ServerController that does nothing.
  class NoServerController implements ServerController {
    init(TodoController todo) { }
  }
  
negative.code: //
  // If you create classes that are referenced from the Angular
  // expressions, you must include a library target in @MirrorsUsed.
  @MirrorsUsed(
      targets: const [ 'Item' ],
      override: '*')
  import 'dart:mirrors';
  
  class Item {
  