pkg/front_end/testcases/runtime_checks_new/field_forwarding_stub_explicit_covariant.dart

// 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
/*@testedFeatures=checks*/
library test;

class B {
  covariant num x;
}

class C {
  int x;
}

class D extends C implements B {}

void main() {}