LanguageFeatures/nnbd/exports_A01_functions_t09.dart

/*
 * Copyright (c) 2020, 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 If an unmigrated library re-exports a migrated library, the
 * re-exported symbols retain their migrated status (that is, downstream
 * migrated libraries will see their migrated types).
 * @description Check that if function which returns nullable is exported from
 * opted-in library to legacy library and then back to the opted in code, it
 * retains its status and so can return [null].
 * @author iarkh@unipro.ru
 */
// SharedOptions=--enable-experiment=non-nullable
// Requirements=nnbd-strong

import "dart:async";
import "../../Utils/expect.dart";
import "exports_legacy_A01_lib.dart";

main() {
  Expect.isTrue(getNullableInt is int? Function());
  Expect.isNull(getNullableInt());

  Expect.isTrue(getNullableObject is Object? Function());
  Expect.isNull(getNullableObject());

  Expect.isTrue(getDynamic is dynamic Function());
  Expect.isNull(getDynamic());

  Expect.isTrue(getNullableFunction is Function? Function());
  Expect.isNull(getNullableFunction());

  Expect.isTrue(getNull is Null Function());
  Expect.isNull(getNull());

  Expect.isTrue(getFutureOr is FutureOr Function());
  Expect.isNull(getFutureOr());
}