| // Copyright (c) 2019, 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. |
| |
| /// @assertion If e1 translates to F then e1?[e2] translates to: |
| /// SHORT[EXP(e1), fn[x] => x[EXP(e2)]] |
| /// |
| /// @description Check that if e1 translates to F then e1?[e2] translates to: |
| /// SHORT[EXP(e1), fn[x] => x[EXP(e2)]]. Test type aliases |
| /// @author sgrekhov@unipro.ru |
| |
| // Requirements=nnbd-strong |
| import '../../Utils/expect.dart'; |
| |
| class C { |
| int operator[](int index) => index; |
| } |
| |
| typedef CAlias1 = C?; |
| typedef CAlias2 = C; |
| |
| void testShort(C? x) { |
| var actual1 = x?[42]; |
| var n0 = x; |
| var expected1 = n0 == null ? null : n0[42]; |
| Expect.equals(expected1, actual1); |
| } |
| |
| main() { |
| CAlias1 c1 = null; |
| testShort(c1); |
| c1 = new C(); |
| testShort(c1); |
| |
| CAlias1? c2 = null; |
| testShort(c2); |
| c2 = new C(); |
| testShort(c2); |
| |
| CAlias2? c3 = null; |
| testShort(c3); |
| c3 = new C(); |
| testShort(c3); |
| |
| CAlias2 c4 = new C(); |
| testShort(c4); |
| } |