anchor.diff:    ///
     /// See also:
     ///
  -  /// - [WatchProvider] and its `watch` method, similar to [read], but
  +  /// - [WatchContext] and its `watch` method, similar to [read], but
     ///   will make the widget tree rebuild when the obtained value changes.
     /// - [Locator], a typedef to make it easier to pass [read] to objects.
     T read<T>() => Provider.of<T>(this, listen: false);
   }
   
   /// Exposes the [watch] method.
  -extension WatchProvider on BuildContext {
  +extension WatchContext on BuildContext {
     /// Obtain a value from the nearest ancestor provider of type [T], and subscribe
     /// to the provider.
     ///
  
positive.code:   ///
    /// See also:
    ///
    /// - [ReadProvider] and its `read` method, similar to [watch], but doesn't make
    ///   widgets rebuild if the value obtained changes.
    T watch<T>() => Provider.of<T>(this);
  }
  
negative.code: }
  
  /// Exposes the [read] method.
  extension ReadContext on BuildContext {
    /// Obtain a value from the nearest ancestor provider of type [T].
    ///
    /// This method will _not_ make widget rebuild when the value changes.
  