| // Copyright (c) 2025, 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. | |
| void main() { | |
| List<int> list = [1, 2, 3]; | |
| print(subs(list)); | |
| } | |
| List<List<A>> subs<A>(List<A> list) => switch (list) { | |
| [] => [], | |
| [var x, ...var xs] => [ | |
| for (var ys in subs(xs)) ...[ | |
| [x] + ys, | |
| ys, | |
| ], | |
| [x], | |
| ], | |
| }; |