LanguageFeatures/nnbd/weak/exports_A01_functions_t12.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 generic function with nullable type parameter is
/// exported from opted-in library to legacy library and then back to the opted
/// in code, it retains its status and so can accept [Null] as a type parameter.
/// @Issue 40399
/// @author iarkh@unipro.ru

// Requirements=nnbd-weak

import "dart:async";
import "../../../Utils/expect.dart";
import "exports_A01_opted_out_lib.dart";

main() {
  Expect.isTrue(testGenericDynamic is void Function<T extends dynamic>());
  Expect.runtimeIsType<void Function<T extends dynamic>()>(testGenericDynamic);
  testGenericDynamic<Null>();

  Expect.isTrue(testGenericNullableInt is void Function<T extends int?>());
  Expect.runtimeIsType<void Function<T extends int?>()>(testGenericNullableInt);
  testGenericNullableInt<Null>();

  Expect.isTrue(testGenericNullableFunction is void Function<T extends Function?>());
  Expect.runtimeIsType<void Function<T extends Function?>()>(testGenericNullableFunction);
  testGenericNullableFunction<Null>();

  Expect.isTrue(testGenericNullableObject is void Function<T extends Object?>());
  Expect.runtimeIsType<void Function<T extends Object?>()>(testGenericNullableObject);
  testGenericNullableObject<Null>();

  Expect.isTrue(testGenericNull is void Function<T extends Null>());
  Expect.runtimeIsType<void Function<T extends Null>()>(testGenericNull);
  testGenericNull<Null>();
  testGenericNull();

  Expect.isTrue(testGenericFutureOr is void Function<T extends FutureOr>());
  Expect.runtimeIsType<void Function<T extends FutureOr>()>(testGenericFutureOr);
  testGenericFutureOr<Null>();
}