blob: 7af520c24871a494e22239185c1f9c996cdd5a8d [file] [log] [blame]
/*
* Copyright (c) 2020, 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
* NORM(T?) =
* let S be NORM(T)
* if S is a top type then S
* if S is Never then Null
* if S is Never* then Null
* if S is Null then Null
* if S is FutureOr<R> and R is nullable then S
* if S is FutureOr<R>* and R is nullable then FutureOr<R>
* if S is R? then R?
* if S is R* then R?
* else S?
*
* @description Checks that if NORM(T) is FutureOr<R> and R is not nullable then
* NORM(T?) != FutureOr<R>
*
* @author sgrekhov@unipro.ru
*/
import 'dart:async';
class A<X> {}
class B1<X> implements A<X> {}
class C1 extends B1<FutureOr<String>?> implements A<FutureOr<String>> {}
// ^^
// [analyzer]unspecified
// [cfe] unspecified
main() {
new C1();
}