JSTests/test262/test/built-ins/Array/prototype/filter/15.4.4.20-4-9.js

// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-array.prototype.filter
es5id: 15.4.4.20-4-9
description: >
    Array.prototype.filter - side effects produced by step 3 are
    visible when an exception occurs
---*/

        var obj = { 0: 11, 1: 12 };

        var accessed = false;

        Object.defineProperty(obj, "length", {
            get: function () {
                return {
                    toString: function () {
                        accessed = true;
                        return "2";
                    }
                };
            },
            configurable: true
        });
assert.throws(TypeError, function() {
            Array.prototype.filter.call(obj, null);
});
assert(accessed, 'accessed !== true');