LanguageFeatures/Spread-collections/ConstSpreads_A10_t11.dart

// 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 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] as List? : [])};
  //             ^
  // [cfe] Constant evaluation error:
  //                   ^^^^^^^^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.CONST_EVAL_THROWS_EXCEPTION
  const Set s2 = {...?(MyClass(12345) is MyClass ? {12} as Set? : <int>{})};
  //             ^
  // [cfe] Constant evaluation error:
  //                   ^^^^^^^^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.CONST_EVAL_THROWS_EXCEPTION
  const Set s3 = {...?(MyClass(12345) is MyClass ? {12} : null)};
  //             ^
  // [cfe] Constant evaluation error:
  //                   ^^^^^^^^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.CONST_EVAL_THROWS_EXCEPTION
  const Set s4 = {...?(MyClass(12345) is MyClass ? {null} : 1)};
//                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}