| // 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 collection Spec: |
| /// A [spreadElement] starting with [...?] is a constant element if its |
| /// expression is constant and it evaluates to [null] or a constant [List], [Set] |
| /// or [Map] instance originally created by a list, set or map literal. It is a |
| /// potentially constant element if the expression is potentially constant |
| /// expression. |
| /// @description: Checks that constant set spread [...?] element can be |
| /// potentially constant list or set. |
| /// @author iarkh@unipro.ru |
| |
| |
| class MyClass { |
| final String a; |
| const MyClass(Object o) : a = o as String; |
| } |
| |
| |
| main() { |
| const Set s1 = {...?(MyClass(12345) is MyClass ? [12] : [])}; //# 01: compile-time error |
| const Set s2 = {...?(MyClass(12345) is MyClass ? {12} : <int>{})}; //# 02: compile-time error |
| const Set s3 = {...?(MyClass(12345) is MyClass ? {12} : null)}; //# 03: compile-time error |
| const Set s4 = {...?(MyClass(12345) is MyClass ? {null} : 1)}; //# 04: compile-time error |
| } |