| /* |
| * 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 Given a switch statement which switches over an expression e of |
| * type T, where the cases are dispatched based on expressions e0...ek: |
| * |
| * - It is no longer required that the ei evaluate to instances of the same |
| * class. |
| * - It is an error if any of the ei evaluate to a value whose static type is |
| * not a subtype of T. |
| * - It is an error if any of the ei evaluate to constants for which equality |
| * is not primitive. |
| * - If T is an enum type, it is a warning if the switch does not handle all |
| * enum cases, either explicitly or via a default. |
| * - If T is Q? where Q is an enum type, it is a warning if the switch does not |
| * handle all enum cases and null, either explicitly or via a default. |
| * - It is a warning if a switch over a nullable type does not handle null |
| * either explicitly or via a default. |
| * |
| * @description Check that it is no warning if T is Q? where Q is an enum type |
| * and the switch does handle all enum cases and null explicitly |
| * @author sgrekhov@unipro.ru |
| */ |
| // SharedOptions=--enable-experiment=non-nullable |
| // Requirements=nnbd-strong |
| |
| enum E { |
| one, |
| two, |
| three |
| } |
| |
| main() { |
| E? e = E.three; |
| switch (e) { |
| case E.one: |
| true; |
| break; |
| case E.two: |
| false; |
| break; |
| case E.three: |
| 42; |
| break; |
| case null: |
| "42"; |
| } |
| } |