Language/Classes/Constructors/implicit_constructor_t04.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 Iff no constructor is specified for a class C, it implicitly has
/// a default constructor C() : super() {}, unless C is class Object.
/// @description Checks that it is possible to create an instance of the class
/// that doesn't declare any constructors. Use type aliases
/// @author sgrekhov@unipro.ru

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

class C {
  var x;
}
typedef CAlias = C;

main() {
  CAlias c = new CAlias();
  Expect.isTrue(c is C);
  Expect.runtimeIsType<C>(c);
  Expect.equals(null, c.x);

  CAlias c2 = new C();
  Expect.isTrue(c2 is C);
  Expect.runtimeIsType<C>(c2);
  Expect.equals(null, c2.x);
}