I am trying to add distance from user to the Location object, but this requires using an asynchronous call that I can't figure out where and how to do exactly. From there I will sort Locations by distance from user. I tried the code below bc it's where the sorted locations would be used, but I get an error saying "await" can only be used in "async" or "async*" methods even though it is being used with an async function. How do I add distance from user to a Location object given it requires an asynchronous call?
class MapWidget extends StatefulWidget { ... @override _MapWidgetState createState() => _MapWidgetState(); } class _MapWidgetState extends State<MapWidget> { Future <List<Location>> sortLocations() async { return null;//function not done } @override Widget build(BuildContext context) { final List<Location> sortedLocations = await sortLocations(); ... 
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