dart-sdk/tests/language/covariant/subtyping_unsafe_call2_test.dart
Robert Nystrom 5f655a8c27 Migrate language_2/covariant to NNBD.
Change-Id: Icb4eae77fab5257ea00ff948d3f775725398e6ab
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/142067
Commit-Queue: Bob Nystrom <rnystrom@google.com>
Auto-Submit: Bob Nystrom <rnystrom@google.com>
Reviewed-by: Erik Ernst <eernst@google.com>
2020-04-07 01:05:28 +00:00

22 lines
617 B
Dart

// Copyright (c) 2016, 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.
import 'package:expect/expect.dart';
class Implementation {
dynamic method(int x) {}
}
abstract class Interface<T> {
dynamic method(T x);
}
class Subclass extends Implementation implements Interface<int> {}
main() {
Subclass subclass = new Subclass();
Interface<int> intInterface = subclass;
Interface<num> numInterface = intInterface;
Expect.throws(() => numInterface.method(2.5));
}