// Copyright (c) 2018, 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 We say that a type T0 is a subtype of a type T1 (written T0 <: T1)
/// when:
/// Left Null: if T0 is Null then:
/// - if T1 is a type variable (promoted or not) the query is false
/// - If T1 is FutureOr<S> for some S, then the query is true iff Null <: S.
/// - If T1 is Null, S? or S* for some S, then the query is true.
/// - Otherwise, the query is false
/// @description Check that otherwise, the query is false. Test some legacy class
/// @author sgrekhov@unipro.ru
///
/// @description Check that if type T0 not a subtype of a type T1, then instance
/// of T0 cannot be be used as a return value of type T1. Return value is tested.
/// @author sgrekhov@unipro.ru
/// @author ngl@unipro.ru
///
/// This test is generated from left_null_fail_A04.dart and 
/// return_value_fail_x01.dart.
/// Don't modify it. If you want to change this test, change one of the files 
/// above and then run generator.dart to regenerate the tests.


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

Null t0Instance = null;
X t1Instance = new X();

const t1Default = const X();


X returnValueFunc() => t0Instance;
//                       ^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

class ReturnValueTest {
  static X staticTestMethod() => t0Instance;
//                                 ^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
  X testMethod() => t0Instance;
//                    ^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

  X get testGetter => t0Instance;
//                      ^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}

main() {
  X returnValueLocalFunc() => t0Instance;
//                              ^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}