blob: e523d2cbf7cc84e85871aefa6bdb8469048bab3c [file] [log] [blame]
/*
* 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 FutureOr: T1 is FutureOr<S1> and
* either T0 <: Future<S1>
* or T0 <: S1
* or T0 is X0 and X0 has bound S0 and S0 <: T1
* or T0 is X0 & S0 and S0 <: T1
* @description Check that if a type T1 is Future<S1> and a type T0 is X0 and X0
* has bound S0 and S0 <: Future<S1>, then a type T0 is a subtype of a type T1.
* @author ngl@unipro.ru
*/
// SharedOptions=--enable-experiment=non-nullable
import "dart:async";
class S1 {
const S1();
}
class S0 implements Future<S1> {
asStream() => null;
catchError(Function onError, {bool test(Object error)}) => null;
then<T0>(FutureOr<T0> onValue(S1 value), {Function onError}) => null;
timeout(Duration timeLimit, {FutureOr<S1> onTimeout()}) => null;
whenComplete(FutureOr action()) => null;
}
class X0 extends S0 {
}
X0 t0Instance = new X0();
FutureOr<S1> t1Instance = new Future.value(new S1());
const t1Default = const S1();
//# @T0 = X0
//# @T1 = FutureOr<S1>