--- /dev/null
+'use strict';
+var $export = require('./_export')
+ , toObject = require('./_to-object')
+ , toPrimitive = require('./_to-primitive')
+ , getPrototypeOf = require('./_object-gpo')
+ , getOwnPropertyDescriptor = require('./_object-gopd').f;
+
+// B.2.2.5 Object.prototype.__lookupSetter__(P)
+require('./_descriptors') && $export($export.P + require('./_object-forced-pam'), 'Object', {
+ __lookupSetter__: function __lookupSetter__(P){
+ var O = toObject(this)
+ , K = toPrimitive(P, true)
+ , D;
+ do {
+ if(D = getOwnPropertyDescriptor(O, K))return D.set;
+ } while(O = getPrototypeOf(O));
+ }
+});
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