| // Copyright (c) 2018, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| // @dart = 2.9 |
| |
| // Test that TypeErrors happen for async methods without using returned Future. |
| |
| import 'dart:async'; |
| import 'package:expect/expect.dart'; |
| |
| class D<T> { |
| // Parametric covariance check is usually compiled into method. |
| Future<T> add(T n) async { |
| return n; |
| } |
| } |
| |
| main() async { |
| D<num> d = new D<int>(); |
| Expect.throwsTypeError(() => d.add(4.6)); |
| } |