// 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.

// @dart = 2.9

/// @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

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;
}

main() {
  C c = new C("Lily was here");
  C other = new C("No woman no cry");
  Extension1(c) << other;
//              ^^
// [analyzer] unspecified
// [cfe] unspecified
}