// Copyright (c) 2017, 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

import "package:expect/expect.dart";

class A {}

class B extends A {}

void main() {
  A a1 = new B();
  A a2 = new A();
  <B, Object>{a1: 1}; // No error
  <Object, B>{1: a1}; // No error
  Expect.throwsTypeError(() {
    <B, Object>{a2: 1};
  });
  Expect.throwsTypeError(() {
    <Object, B>{1: a2};
  });
}