// Copyright (c) 2019, 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.

/// @assertion The type system is extended with a notion of a legacy type
/// operator. For every type T, there is an additional type T* which is the
/// legacy version of the type. There is no surface syntax for legacy types, and
/// implementations should display the legacy type T* in the same way that they
/// would display the type T, except in so far as it is useful to communicate to
/// programmers for the purposes of error messages that the type originates in
/// unmigrated code.
///
/// @description Check that all fields of legacy type T* are nullable. Test mixin
/// @author sgrekhov@unipro.ru

// Requirements=nnbd-weak
import "legacy_lib.dart";

class B extends A with Mx {}

main() {
  B b = new B();
  b.iMx = null;
}