/*
 * 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) {
  }
}