// 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  In a legacy library, none of the new syntax introduced by this
/// proposal is available, and it is a static error if it is used.
///
/// @description Check that Never is allowed in pre-NNBD legacy library (see
/// https://github.com/dart-lang/co19/issues/548)
/// @author sgrekhov@unipro.ru

// @dart=2.6
// Requirements=nnbd-weak

class A {}

main() {
  if (A is Never) {
  }
}