// Copyright 2015 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.// Flags: --allow-natives-syntaxvaro={}Object.defineProperty(o,"z",{set:function(){%DeoptimizeFunction(f);},});functionf(o){return19+(void(o.z=12));}f(o);