LanguageFeatures/Extension-methods/explicit_extension_member_invocation_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 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[expr2]                                   []
/// @description Check explicit extension member invocation in form of X[expr2]
/// @author sgrekhov@unipro.ru


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

class C {
  String operator [](int index) => "Lily was here:$index";
}

extension Extension1 on C {
  String operator [](int index) => "Show must go on:$index";
}

extension Extension2 on C {
  String operator [](int index) => "Let it be:$index";
}

main() {
  C c = new C();
  Expect.equals("Show must go on:42", Extension1(c)[42]);
  Expect.equals("Let it be:13", Extension2(c)[13]);
  Expect.equals("Lily was here:451", c[451]);
}