// 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:
 * Right Object: if T1 is Object then:
 *  - if T0 is an unpromoted type variable with bound B then T0 <: T1 iff
 *      B <: Object
 *  - if T0 is a promoted type variable X & S then T0 <: T1 iff S <: Object
 *  - if T0 is FutureOr<S> for some S, then T0 <: T1 iff S <: Object.
 *  - if T0 is S* for any S, then T0 <: T1 iff S <: T1
 *  - if T0 is Null, dynamic, void, or S? for any S, then the subtyping does not
 *      hold (per above, the result of the subtyping query is false).
 *  - Otherwise T0 <: T1 is true.
 * @description Check that if T0 is an unpromoted type variable with bound B
 * but B is not subtype of Object then T0 is not subtype of T1
 * @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 right_object_fail_A01.dart and 
 * return_value_fail_x01.dart.
 * Don't modify it. If you want to change this file, change one of the files 
 * above and then run generator.dart to regenerate the tests.
 */


class B {}
class T0 extends B {}

T0? t0Instance = new T0();
Object t1Instance = new Object();

const t1Default = const Object();


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

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

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


test<T extends B?>(T t0Instance) {
  
  Object returnValueLocalFunc() => t0Instance;
//                              ^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

}

main() {
  test<T0?>(t0Instance);
}