text: 'use strict';
  var $ = require('../internals/export');
  var DESCRIPTORS = require('../internals/descriptors');
  var FORCED = require('../internals/forced-object-prototype-accessors-methods');
  var toObject = require('../internals/to-object');
  var toPrimitive = require('../internals/to-primitive');
  var getPrototypeOf = require('../internals/object-get-prototype-of');
  var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f;
  
  // `Object.prototype.__lookupSetter__` method
  // https://tc39.github.io/ecma262/#sec-object.prototype.__lookupSetter__
  if (DESCRIPTORS) {
    $({ target: 'Object', proto: true, forced: FORCED }, {
      __lookupSetter__: function __lookupSetter__(P) {
        var O = toObject(this);
        var key = toPrimitive(P, true);
        var desc;
        do {
          if (desc = getOwnPropertyDescriptor(O, key)) return desc.set;
        } while (O = getPrototypeOf(O));
      }
    });
  }
  