| // 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. |
| |
| // @dart = 2.9 |
| |
| /// @assertion From the Unified collections Spec: |
| /// We require that at least one component unambiguously determine the literal |
| /// form, otherwise it is a compile-time error. So, given: |
| /// dynamic x = <int, int>{}; |
| /// Iterable l = []; |
| /// Map m = {}; |
| /// Then: |
| /// {...x} // Static error, because it is ambiguous. |
| /// {...x, ...l} // Statically a set, runtime error when spreading x. |
| /// {...x, ...m} // Statically a map, no runtime error. |
| /// {...l, ...m} // Static error, because it must be both a set and a map. |
| /// @description Checks that {...l, ...m} is a static error |
| /// @author iarkh@unipro.ru |
| |
| |
| main() { |
| Iterable l = []; |
| Map m = {}; |
| var res1 = {...l, ...m}; //# 01: compile-time error |
| var res2 = {...m, ...l}; //# 02: compile-time error |
| List res3 = {...l, ...m}; //# 03: compile-time error |
| Map res4 = {...l, ...m}; //# 04: compile-time error |
| } |
