LanguageFeatures/Subtyping/dynamic/generated/right_object_fail_return_value_fail_A08_t01.dart

// 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 FutureOr<S> for some S but S 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 used as a return value of type T1
/// @author sgrekhov@unipro.ru
///
/// This test is generated from right_object_fail_A08.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.


import '../../utils/common.dart';
import '../../../../Utils/expect.dart';

// Requirements=nnbd-strong
import "dart:async";

FutureOr<Null> t0Instance = null;
Object t1Instance = new Object();

const t1Default = const Object();




Object returnValueFunc() => forgetType(t0Instance);

class ReturnValueTest {
  static Object staticTestMethod() => forgetType(t0Instance);

  Object testMethod() => forgetType(t0Instance);

  Object get testGetter => forgetType(t0Instance);
}

class ReturnValueGen<X> {
  X testMethod() => forgetType(t0Instance);
  X get testGetter => forgetType(t0Instance);
}

main() {
  Object returnValueLocalFunc() => forgetType(t0Instance);

  Expect.throws(() {
    returnValueFunc();
  }, (e) => e is TypeError || e is CastError);
  Expect.throws(() {
    returnValueLocalFunc();
  }, (e) => e is TypeError || e is CastError);
  Expect.throws(() {
    ReturnValueTest.staticTestMethod();
  }, (e) => e is TypeError || e is CastError);

  Expect.throws(() {
    new ReturnValueTest().testMethod();
  }, (e) => e is TypeError || e is CastError);
  Expect.throws(() {
    new ReturnValueTest().testGetter;
  }, (e) => e is TypeError || e is CastError);

  // Test type parameters

  //# <-- NotGenericFunctionType
  Expect.throws(() {
    new ReturnValueGen<Object>().testMethod();
  }, (e) => e is TypeError || e is CastError);
  Expect.throws(() {
    new ReturnValueGen<Object>().testGetter;
  }, (e) => e is TypeError || e is CastError);
  //# -->
}