| // 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 To handle these gracefully, we support a [...?] "null-aware |
| * spread" operator. In cases where the spread expression evaluates to [null], |
| * that expands to an empty collection instead of throwing a runtime expression. |
| * |
| * That turns the example to: |
| * |
| * var command = [ |
| * engineDartPath, |
| * '--target=flutter', |
| * ...?extraFrontEndOptions, |
| * mainPath |
| * ]; |
| * @description Checks that it is a compile error if spreadable element in the |
| * [Map] is not null-aware and it's [null]. |
| * @author iarkh@unipro.ru |
| */ |
| |
| Map getAMap( |
| String engineDartPath, Map? extraFrontEndOptions, String mainPath) { |
| return({1: engineDartPath, 2: '--target=flutter', ...extraFrontEndOptions, |
| // ^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| 3: mainPath}); |
| } |
| |
| main() { |
| getAMap("enginePath", null, "mainPath"); |
| } |
