test/language/expressions/compound-assignment/11.13.2-48-s.js


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

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

/*---
es5id: 11.13.2-48-s
description: >
    Strict Mode - TypeError is thrown if The LeftHandSide of a
    Compound Assignment operator(+=) is a reference to a non-existent
    property of an object whose [[Extensible]] internal property is
    false
flags: [onlyStrict]
includes: [runTestCase.js]
---*/

function testcase() {
        var obj = {};
        Object.preventExtensions(obj);

        try {
            obj.len += 10;
            return false;
        } catch (e) {
            return e instanceof TypeError;
        }
    }
runTestCase(testcase);