| /* |
| * 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 A null-shorting cascade expression e?..s translates as follows, |
| * where x and y are fresh object level variables. |
| * fn[k : Exp -> Exp] : Exp => |
| * let x = EXP(e) in x == null ? null : let y = EXP(x.s) in k(x) |
| * |
| * @description Check that a null-shorting cascade expression e?..s translates |
| * as follows, where x and y are fresh object level variables. |
| * fn[k : Exp -> Exp] : Exp => |
| * let x = EXP(e) in x == null ? null : let y = EXP(x.s) in k(x) |
| * Check that '?..' operator must be the first in the cascade sequence. Test |
| * type aliases |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=non-nullable,nonfunction-type-aliases |
| // Requirements=nnbd-strong |
| |
| class C { |
| String test1 = "Let it be"; |
| String test2 = "Show must go on"; |
| void foo() {} |
| } |
| |
| typedef CAlias1 = C?; |
| typedef CAlias2 = C; |
| |
| main() { |
| CAlias1? c1 = null; |
| c1 ?.. test1 |
| ?.. test2 |
| // ^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| ?.. foo(); |
| // ^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| CAlias1 c2 = null; |
| c2 ?.. test1 |
| ?.. test2 |
| // ^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| ?.. foo(); |
| // ^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| |
| CAlias2? c3 = null; |
| c3 ?.. test1 |
| ?.. test2 |
| // ^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| ?.. foo(); |
| // ^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |