| // 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 'Future<String>' can't be assigned to a variable of type 'FutureOr<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 { |
| return new Future<int>.value(3); |
| // ^^^^^^^^^^^^^^^^^^^^^^^^ |
| // [analyzer] COMPILE_TIME_ERROR.RETURN_OF_INVALID_TYPE |
| } |
| |
| 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. |
| //^^^^^^^^^ |
| // [analyzer] COMPILE_TIME_ERROR.RETURN_IN_GENERATOR |
| } |
| |
| 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. |
| //^^^^^^^^^ |
| // [analyzer] COMPILE_TIME_ERROR.RETURN_IN_GENERATOR |
| } |
| |
| 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); |
| } |