blob: f9f1ff9721eaca5d270688e06359e2aca33b7b9f [file] [log] [blame]
// Copyright (c) 2016, 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.
// In strong mode, `FutureOr` should be equivalent to the union of `Future<T>`
// and `T`.
import 'dart:async';
import 'package:expect/expect.dart';
typedef void FunTakes<T>(T x);
typedef T FunReturns<T>();
main() {
Expect.isTrue(499 is FutureOr); // Same as `is Object`.
Expect.isTrue(499 is FutureOr<int>);
Expect.isFalse(499 is FutureOr<String>);
Expect.isTrue(new Future.value(499) is FutureOr); // Same as `is Object`.
Expect.isTrue(new Future.value(499) is FutureOr<int>);
Expect.isFalse(new Future.value(499) is FutureOr<String>);
void foo(FutureOr x) {} // Equivalent to `void bar(Object x) {}`.
// A function that takes Object takes everything.
Expect.isTrue(foo is FunTakes<dynamic>);
Expect.isTrue(foo is FunTakes<Object>);
Expect.isTrue(foo is FunTakes<int>);
Expect.isTrue(foo is FunTakes<String>);
Expect.isTrue(foo is FunTakes<Future<int>>);
Expect.isTrue(foo is FunTakes<Future<String>>);
Expect.isTrue(foo is FunTakes<FutureOr<Object>>);
Expect.isTrue(foo is FunTakes<FutureOr<int>>);
Expect.isTrue(foo is FunTakes<FutureOr<String>>);
Expect.isTrue(foo is FunTakes<FutureOr<FutureOr<Object>>>);
Expect.isTrue(foo is FunTakes<FutureOr<FutureOr<int>>>);
Expect.isTrue(foo is FunTakes<FutureOr<FutureOr<String>>>);
FutureOr bar() => 499; // Equivalent to `Object foo() => 499`.
Expect.isTrue(bar is FunReturns<dynamic>);
Expect.isTrue(bar is FunReturns<Object>);
Expect.isFalse(bar is FunReturns<int>);
Expect.isFalse(bar is FunReturns<String>);
Expect.isFalse(bar is FunReturns<Future<int>>);
Expect.isFalse(bar is FunReturns<Future<String>>);
Expect.isTrue(bar is FunReturns<FutureOr<Object>>);
Expect.isFalse(bar is FunReturns<FutureOr<int>>);
Expect.isFalse(bar is FunReturns<FutureOr<String>>);
Expect.isTrue(bar is FunReturns<FutureOr<FutureOr<Object>>>);
Expect.isFalse(bar is FunReturns<FutureOr<FutureOr<int>>>);
Expect.isFalse(bar is FunReturns<FutureOr<FutureOr<String>>>);
void foo2(FutureOr<String> x) {}
Expect.isFalse(foo2 is FunTakes<dynamic>);
Expect.isFalse(foo2 is FunTakes<Object>);
Expect.isFalse(foo2 is FunTakes<int>);
Expect.isTrue(foo2 is FunTakes<String>);
Expect.isFalse(foo2 is FunTakes<Future<int>>);
Expect.isTrue(foo2 is FunTakes<Future<String>>);
Expect.isFalse(foo2 is FunTakes<FutureOr<Object>>);
Expect.isFalse(foo2 is FunTakes<FutureOr<int>>);
Expect.isTrue(foo2 is FunTakes<FutureOr<String>>);
Expect.isFalse(foo2 is FunTakes<FutureOr<FutureOr<Object>>>);
Expect.isFalse(foo2 is FunTakes<FutureOr<FutureOr<int>>>);
Expect.isFalse(foo2 is FunTakes<FutureOr<FutureOr<String>>>);
FutureOr<int> bar2() => 499;
Expect.isTrue(bar2 is FunReturns<dynamic>);
Expect.isTrue(bar2 is FunReturns<Object>);
Expect.isFalse(bar2 is FunReturns<int>);
Expect.isFalse(bar2 is FunReturns<String>);
Expect.isFalse(bar2 is FunReturns<Future<int>>);
Expect.isFalse(bar2 is FunReturns<Future<String>>);
Expect.isTrue(bar2 is FunReturns<FutureOr<Object>>);
Expect.isTrue(bar2 is FunReturns<FutureOr<int>>);
Expect.isFalse(bar2 is FunReturns<FutureOr<String>>);
Expect.isTrue(bar2 is FunReturns<FutureOr<FutureOr<Object>>>);
Expect.isTrue(bar2 is FunReturns<FutureOr<FutureOr<int>>>);
Expect.isFalse(bar2 is FunReturns<FutureOr<FutureOr<String>>>);
void foo3(String x) {}
Expect.isFalse(foo3 is FunTakes<dynamic>);
Expect.isFalse(foo3 is FunTakes<Object>);
Expect.isFalse(foo3 is FunTakes<int>);
Expect.isTrue(foo3 is FunTakes<String>);
Expect.isFalse(foo3 is FunTakes<Future<int>>);
Expect.isFalse(foo3 is FunTakes<Future<String>>);
Expect.isFalse(foo3 is FunTakes<FutureOr<Object>>);
Expect.isFalse(foo3 is FunTakes<FutureOr<int>>);
Expect.isFalse(foo3 is FunTakes<FutureOr<String>>);
Expect.isFalse(foo3 is FunTakes<FutureOr<FutureOr<Object>>>);
Expect.isFalse(foo3 is FunTakes<FutureOr<FutureOr<int>>>);
Expect.isFalse(foo3 is FunTakes<FutureOr<FutureOr<String>>>);
int bar3() => 499;
Expect.isTrue(bar3 is FunReturns<dynamic>);
Expect.isTrue(bar3 is FunReturns<Object>);
Expect.isTrue(bar3 is FunReturns<int>);
Expect.isFalse(bar3 is FunReturns<String>);
Expect.isFalse(bar3 is FunReturns<Future<int>>);
Expect.isFalse(bar3 is FunReturns<Future<String>>);
Expect.isTrue(bar3 is FunReturns<FutureOr<Object>>);
Expect.isTrue(bar3 is FunReturns<FutureOr<int>>);
Expect.isFalse(bar3 is FunReturns<FutureOr<String>>);
Expect.isTrue(bar3 is FunReturns<FutureOr<FutureOr<Object>>>);
Expect.isTrue(bar3 is FunReturns<FutureOr<FutureOr<int>>>);
Expect.isFalse(bar3 is FunReturns<FutureOr<FutureOr<String>>>);
}