Where/How is the parameter for `myTapCallback()` passed to The `MyListItem(myTapCallback)` call ?

```
    @override
Widget build(BuildContext context) {
  return SomeWidget(
    // Construct the widget, passing it a reference to the method above.
    MyListItem(myTapCallback),  //<—- where is item?
  );
}

void myTapCallback(Item item) {
  print('user tapped on $item');
}

```

*Source: <https://flutter.dev/docs/development/data-and-backend/state-mgmt/simple>*