| // Copyright (c) 2017, 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. |
| |
| // @dart = 2.9 |
| |
| import "package:expect/expect.dart"; |
| |
| void block_test() { |
| List<Object> Function() g; |
| g = () { |
| return [3]; |
| }; |
| assert(g is List<Object> Function()); |
| assert(g is! List<int> Function()); |
| g().add("hello"); // No runtime error |
| List<int> l = [3]; |
| g = () { |
| return l; |
| }; |
| assert(g is List<Object> Function()); |
| assert(g is List<int> Function()); |
| Expect.throwsTypeError(() { |
| g().add("hello"); // runtime error |
| }); |
| Object o = l; |
| g = () { |
| return o; |
| }; // No implicit downcast on the assignment, implicit downcast on the return |
| assert(g is List<Object> Function()); |
| assert(g is! List<int> Function()); |
| assert(g is Object Function()); |
| g(); // No runtime error; |
| o = 3; |
| Expect.throwsTypeError(() { |
| g(); // Failed runtime cast on the return type of f |
| }); |
| } |
| |
| void arrow_test() { |
| List<Object> Function() g; |
| g = () => [3]; |
| assert(g is List<Object> Function()); |
| assert(g is! List<int> Function()); |
| g().add("hello"); // No runtime error |
| List<int> l = [3]; |
| g = () => l; |
| assert(g is List<Object> Function()); |
| assert(g is List<int> Function()); |
| Expect.throwsTypeError(() { |
| g().add("hello"); // runtime error |
| }); |
| Object o = l; |
| g = () => |
| o; // No implicit downcast on the assignment, implicit downcast on the return |
| assert(g is List<Object> Function()); |
| assert(g is! List<int> Function()); |
| assert(g is Object Function()); |
| g(); // No runtime error; |
| o = 3; |
| Expect.throwsTypeError(() { |
| g(); // Failed runtime cast on the return type of f |
| }); |
| } |
| |
| main() { |
| block_test(); |
| arrow_test(); |
| } |