| // Copyright (c) 2018, 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 test program to test arithmetic operations. |
| |
| import "package:expect/expect.dart"; |
| |
| class B {} |
| |
| class C { |
| B call(B b) => b; |
| } |
| |
| class D implements Function { |
| B call(B b) => b; |
| } |
| |
| typedef B BToB(B x); |
| |
| typedef Object NullToObject(Null x); |
| |
| main() { |
| // The presence of a `.call` method does not cause class `C` to become a |
| // subtype of any function type. |
| C c = new C(); |
| Expect.throwsTypeError(() => c as BToB); //# 01: ok |
| Expect.throwsTypeError(() => c as NullToObject); //# 02: ok |
| Expect.throwsTypeError(() => c as Function); //# 03: ok |
| |
| // The same goes for class `D`: `implements Function` is ignored in Dart 2. |
| D d = new D(); |
| Expect.throwsTypeError(() => d as BToB); //# 04: ok |
| Expect.throwsTypeError(() => d as NullToObject); //# 05: ok |
| Expect.throwsTypeError(() => d as Function); //# 06: ok |
| } |