blob: b98ddaa82a6c128dabbe236767650bea05176efa [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:
* Left FutureOr: T0 is FutureOr<S0>
* and Future<S0> <: T1
* and S0 <: T1
* @description Check that if a type T0 is FutureOr<S0> and Future<S0> and S0
* are subtypes of a type T1, then a type T0 is a subtype of a type T1. Case
* when an instance of T0 is an instance of Future<S0> type and S0 is a generic
* type
* @author
// SharedOptions=--enable-experiment=non-nullable
import "dart:async";
class A {}
class B extends A {}
class C<X> {
const C();
class S0<X> extends C<X> {}
FutureOr<S0<B>> t0Instance = new Future<S0<B>>.value(new S0<B>());
FutureOr<C<A>> t1Instance = new Future<C<A>>.value(new C<A>());
const t1Default = const C<A>();
//# @T0 = FutureOr<S0<B>>
//# @T1 = FutureOr<C<A>>