LanguageFeatures/Spread-collections/StaticSemantic_A10_t09.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 It is a compile-time error if:
/// A spread element in a list or set literal has a static type that is not
/// dynamic and not a subtype of Iterable<Object>.
/// @description Checks that compile error is thrown if null-aware spread element
/// in the sett is not dynamic and is not assignable to [Iterable] or [Null]
/// @author iarkh@unipro.ru


import "dart:async";

main() {
  Object? x1;
  Map? x2;
  int? x3;
  void x4;
  Future? x5;
  FutureOr x6;

  Set s1 = {...?x1};
//              ^^
// [analyzer] unspecified
// [cfe] unspecified
  Set s2 = {...?x2};
  //       ^^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT
  // [cfe] Both Iterable and Map spread elements encountered in ambiguous literal.
  Set s3 = {...?x3};
//              ^^
// [analyzer] unspecified
// [cfe] unspecified
  Set s4 = {...?x4};
//              ^^
// [analyzer] unspecified
// [cfe] unspecified
  Set s5 = {...?x5};
//              ^^
// [analyzer] unspecified
// [cfe] unspecified
  Set s6 = {...?x6};
//              ^^
// [analyzer] unspecified
// [cfe] unspecified
}