import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  Stream<int> get stream async* {
    throw StateError('error');
  }

  @override
  Widget build(BuildContext context) {
    return Directionality(
      textDirection: TextDirection.ltr,
      child: StreamBuilder<int>(
        stream: stream,
        builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
          return Text('${snapshot.data}');
        },
      ),
    );
  }
}