// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

var custom_toString = function() {
  var boom = custom_toString.caller;
  return boom;
}

var object = {};
object.toString = custom_toString;

try { Object.hasOwnProperty(object); } catch (e) {}