node/deps/v8/test/mjsunit/regress/readonly5.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
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//       with the distribution.
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//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
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this.__proto__ = null;
this.x = 10;
delete this.x;

function s(v) {
  return v.x = 1;
}

function s_strict(v) {
  "use strict";
  return v.x = 1;
}

function c() {
  var o = {__proto__:this};
  return o;
}

var o1 = c();
var o2 = c();
var o1_strict = c();
var o2_strict = c();
var o3 = c();
var o4 = c();

// Initialize the store IC.
s(o1);
s(o2);
s_strict(o1_strict);
s_strict(o2_strict);

Object.defineProperty(this, "x", {writable:false, configurable:true});

// Verify that directly setting x fails.
o3.x = 1;
assertEquals(undefined, o3.x);

// Verify that setting x through the IC fails.
assertThrows("s_strict(o4)", TypeError);
s(o4);
assertEquals(undefined, o4.x);