LanguageFeatures/Extension-methods/explicit_extension_member_invocation_A10_t13.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 binop expr2        +, -, *, /, ~/, %, <, <=, >, >=, <<, >>, >>>, ^, |, &
/// @description Check explicit extension member invocation in form of X < expr2
/// @author sgrekhov@unipro.ru


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

class C {
  String value;
  C(this.value);
  String operator <(C other) => this.value + "," + other.value;
}

extension Extension1 on C {
  String operator <(C other) => "Show must go on," + other.value;
}

extension Extension2 on C {
  String operator <(C other) => "Let it be," + other.value;
}

main() {
  C c = new C("Lily was here");
  C other = new C("No woman no cry");
  Expect.equals("Show must go on,No woman no cry", Extension1(c) < other);
  Expect.equals("Let it be,No woman no cry", Extension2(c) < other);
  Expect.equals("Lily was here,No woman no cry", c < other);
}