anchor.diff:    }
   }
   
  +/// The signature of build() functions.
  +typedef Widget _BuildFunction(BuildContext context);
  +
   /// StatelessWidgets describe a way to compose other Widgets to form reusable
   /// parts, which doesn't depend on anything other than the configuration
   /// information in the object itself. (For compositions that can change
  
positive.code:   Widget build(BuildContext context);
  
    /// Trampoline to make the [build] closure library-accessible.
    Widget _build(BuildContext context) => build(context);
  
    /// Called when an Inherited widget in the ancestor chain has changed. Usually
    /// there is nothing to do here; whenever this is called, build() is also
  
negative.code:   Widget build(BuildContext context);
  
    /// Trampoline to make the [build] closure library-accessible.
    _BuildFunction get _build => build;
  }
  
  /// StatefulWidgets provide the configuration for
  