LanguageFeatures/Set-literals/disambiguating_A02_t01.dart

// Copyright (c) 2018, 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 Let e be a setOrMapLiteral.
/// If e has a context C, and the base type of C is Cbase (that is, Cbase is C
/// with all wrapping FutureOrs removed), and Cbase is not ?, then let S be the
/// greatest closure.
/// ...
/// if S is defined and is a subtype of Iterable<Object> and S is not a subtype
/// of Map<Object, Object>, then e is a set literal.
///
/// @description Checks that if s is an emptySetOrMapLiteral with no
/// typeArguments and static context type C, then if S is a subtype of
/// Iterable<Object> and S is not a subtype of Map<Object, Object>, then e is a
/// set literal
/// @author sgrekhov@unipro.ru

import "dart:async";
import "../../Utils/expect.dart";

Set<Object> test() => {};
Iterable<int> test2() => {};
FutureOr<Iterable<int>> test3() => {};
Set<int> test4() => {};

main() {
  Expect.isTrue(test() is Set);
  Expect.isTrue(test2() is Set);
  Expect.isTrue(test3() is Set);
  Expect.isTrue(test4() is Set);
  Expect.runtimeIsType<Set>(test());
  Expect.runtimeIsType<Set>(test2());
  Expect.runtimeIsType<Set>(test3());
  Expect.runtimeIsType<Set>(test4());

  Iterable<Object> o = {};
  Expect.isTrue(o is Set);
  Expect.runtimeIsType<Set>(o);

  Iterable<Object?> o1 = {};
  Expect.isTrue(o1 is Set);
  Expect.runtimeIsType<Set>(o1);
}