| // Copyright (c) 2020, 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 Variable or getter: If N is an expression of the form x where the |
| /// type of x is T then: |
| /// |
| /// If T <: Never then: |
| /// Let null(N) = unreachable(before(N)). |
| /// Let notNull(N) = unreachable(before(N)). |
| /// Otherwise if T <: Null then: |
| /// Let null(N) = before(N). |
| /// Let notNull(N) = unreachable(before(N)). |
| /// Otherwise if T is non-nullable then: |
| /// Let null(N) = unreachable(before(N)). |
| /// Let notNull(N) = before(N). |
| /// |
| /// @description Checks reachability after variable or getter. Test getter of |
| /// type Never |
| /// |
| /// @author sgrekhov@unipro.ru |
| |
| |
| Never get n => throw "Lily was here"; |
| |
| main() { |
| try { |
| late int i; |
| bool b = (() => true)(); |
| if (b) { |
| n; // The code after this point is unreachable |
| i = 42; // Variable is initialized in a dead code. This leaves it definitely unassigned |
| } |
| i; // It is an error to read a local late variable when it is definitely unassigned. |
| //^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } catch (_) {} |
| } |