blob: c28aeaedec6d629cbfed3f829462308a0a661ac8 [file] [log] [blame]
// Copyright (c) 2015, 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.
import "dart:async";
import "package:expect/expect.dart";
import "package:async_helper/async_helper.dart";
Future foo1() async {
return 3;
}
Future<int> foo2() async {
return 3;
}
Future<int>
foo3() async {
return "String";
// ^^^^^^^^
// [analyzer] COMPILE_TIME_ERROR.RETURN_OF_INVALID_TYPE
// [cfe] A value of type 'String' can't be returned from an async function with return type 'Future<int>'.
}
Future<int, String>
// [error line 25, column 1, length 19]
// [analyzer] COMPILE_TIME_ERROR.WRONG_NUMBER_OF_TYPE_ARGUMENTS
// [cfe] Expected 1 type arguments.
foo4() async {
return "String";
}
int
// [error line 33, column 1, length 3]
// [analyzer] COMPILE_TIME_ERROR.ILLEGAL_ASYNC_RETURN_TYPE
foo5() async {
// [error line 36, column 1]
// [cfe] Functions marked 'async' must have a return type assignable to 'Future'.
return 3;
}
Future<int> foo6() async {
// This is fine, the future is flattened
return new Future<int>.value(3);
}
Future<Future<int>> foo7() async {
// This is fine, the future is used to complete the returned future.
return new Future<int>.value(3);
}
Iterable<int> foo8() sync* {
yield 1;
// Can only have valueless return in sync* functions.
return 8;
//^^^^^^
// [analyzer] COMPILE_TIME_ERROR.RETURN_IN_GENERATOR
// [cfe] 'sync*' and 'async*' can't return a value.
}
Stream<int> foo9() async* {
yield 1;
// Can only have valueless return in async* functions.
return 8;
//^^^^^^
// [analyzer] COMPILE_TIME_ERROR.RETURN_IN_GENERATOR
// [cfe] 'sync*' and 'async*' can't return a value.
}
test() async {
Expect.equals(3, await foo1());
Expect.equals(3, await foo2());
Expect.equals("String", await foo3());
Expect.equals("String", await foo4());
Expect.equals(3, await foo5());
Expect.equals(3, await await foo6());
Expect.equals(3, await await foo7());
Expect.listEquals([1], foo8().toList());
Expect.listEquals([1], await foo9().toList());
}
main() {
asyncTest(test);
}