anchor.diff:    }
   }
   
  -class ResourceRoute {
  +class RouteHandler {
     final ResourcePattern pattern;
     final RequestHandler handler;
   
  -  ResourceRoute(this.pattern, this.handler);
  +  RouteHandler(this.pattern, this.handler);
   }
   
   class RouterException implements Exception {
  
positive.code:     return _createRoute(pattern).handler;
    }
  
    ResourceRoute _createRoute(String pattern) {
      if (basePath != null) {
        pattern = basePath + pattern;
      }
  
negative.code: ///
  /// Each route added to a [Router] creates a [Stream] of [Request]s that a handler can listen to.
  class Router extends RequestHandler {
    List<RouteHandler> routes;
  
    /// A string to be prepended to the beginning of every route this [Router] manages.
    ///
  