|  | // Copyright 2020 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-syntax | 
|  |  | 
|  | (function main() { | 
|  | eval(); | 
|  | function foo() { | 
|  | bla = []; | 
|  | bla.__proto__ = ''; | 
|  | } | 
|  | %PrepareFunctionForOptimization(foo); | 
|  | foo(); | 
|  | Object.defineProperty(this, 'bla', | 
|  | {value: bla, configurable: false, writable: true}); | 
|  | foo(); | 
|  | %OptimizeFunctionOnNextCall(foo); | 
|  | foo(); | 
|  | Object.defineProperty(this, 'bla', | 
|  | {value: bla, configurable: false, writable: false}); | 
|  | foo(); | 
|  | })(); |