blob: 81f6135bce8186a62ff1f20bc9835247c986e353 [file] [log] [blame]
* Copyright (c) 2019, 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
* @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
* @author
* This test is generated from right_object_fail_A04.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.
import '../../utils/common.dart';
import '../../../../Utils/expect.dart';
// SharedOptions=--enable-experiment=non-nullable
import "dart:async";
class S {}
FutureOr<S?> t0Instance = new S();
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);
Expect.throws(() {returnValueLocalFunc();}, (e) => e is TypeError);
Expect.throws(() {ReturnValueTest.staticTestMethod();}, (e) => e is TypeError);
Expect.throws(() {new ReturnValueTest().testMethod();}, (e) => e is TypeError);
Expect.throws(() {new ReturnValueTest().testGetter;}, (e) => e is TypeError);
// Test type parameters
//# <-- NotGenericFunctionType
Expect.throws(() {new ReturnValueGen<Object>().testMethod();}, (e) => e is TypeError);
Expect.throws(() {new ReturnValueGen<Object>().testGetter;}, (e) => e is TypeError);
//# -->