LanguageFeatures/Set-literals/type_inference_A11_t01.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 To infer the type of element:
/// ...
/// If element is a spreadElement with expression e1:
///
/// If P is ? then let S be the inferred type of e1 in context ?:
/// ...
/// If none of these cases match, it is an error.
///
/// @description Checks that it is a compile error if none of the cases
/// (`Iterable<Object>` nor of `Map<Object, Object>`, and it's also not
/// `dynamic` nor `Null`) match
/// @author sgrekhov@unipro.ru

void test<T>(T t) {
  var s1 = {...t };
//         ^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
  var s2 = {...?t};
//         ^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

  var s3 = {...(t as dynamic) };
//         ^^^^^^^^^^^^^^^^^^^^
// [analyzer] COMPILE_TIME_ERROR.AMBIGUOUS_SET_OR_MAP_LITERAL_EITHER
// [cfe] Not enough type information to disambiguate between literal set and literal map.
  var s4 = {...?(t as dynamic)};
//         ^^^^^^^^^^^^^^^^^^^^
// [analyzer] COMPILE_TIME_ERROR.AMBIGUOUS_SET_OR_MAP_LITERAL_EITHER
// [cfe] Not enough type information to disambiguate between literal set and literal map.
}

main() {
  test([1, 2, 3]);
  test({1: "1", 2: "2"});
}