LanguageFeatures/Set-literals/type_inference_A01_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 In a setOrMapLiteral collection, the inferred type of an element
/// is a set element type T, a pair of a key type K and a value type V, or both.
/// It is computed relative to a context type P:
///
/// If collection is unambiguously a set literal, then P is Set<Pe> where Pe is
/// determined by downwards inference, and may be ? if downwards inference does
/// not constrain it.
///
/// @description Checks that if collection is unambiguously a set literal, then P
/// is Set<Pe> where Pe is determined by downwards inference
/// @author sgrekhov@unipro.ru

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

class C {}

main() {
  Expect.isTrue({1, 2, 3} is Set<int>);
  Expect.isTrue({new C()} is Set<C>);
  Expect.isTrue({1, 2, 3.14} is Set<num>);
  Expect.isTrue({1, 2, "3.14"} is Set<Object>);
  Expect.runtimeIsType<Set<int>>({1, 2, 3});
  Expect.runtimeIsType<Set<C>>({new C()});
  Expect.runtimeIsType<Set<num>>({1, 2, 3.14});
  Expect.runtimeIsType<Set<Object>>({1, 2, "3.14"});
}