LanguageFeatures/Extension-methods/explicit_extension_member_invocation_A08_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 A simple member invocation on a target expression X is an
/// expression of one of the forms:
/// Member invocation on target X	     Corresponding member name
///   -X                                     unary-
/// @description Check explicit extension member invocation in form of -X
/// @author sgrekhov@unipro.ru


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

class C {
  String operator -() => "Lily was here";
}

extension Extension1 on C {
  String operator -() => "Show must go on";
}

extension Extension2 on C {
  String operator -() => "Let it be";
}

main() {
  C c = new C();
  Expect.equals("Show must go on", -Extension1(c));
  Expect.equals("Let it be", -Extension2(c));
  Expect.equals("Lily was here", -c);
}