| // 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"); |
| } |
