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// Copyright (c) 2012 Ecma International. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es5id: 11.13.2-31-s
description: >
Strict Mode - TypeError is thrown if The LeftHandSide of a
Compound Assignment operator(&=) is a reference to a data property
with the attribute value {[[Writable]]:false}
flags: [onlyStrict]
---*/
var obj = {};
Object.defineProperty(obj, "prop", {
value: 10,
writable: false,
enumerable: true,
configurable: true
});
assert.throws(TypeError, function() {
obj.prop &= 20;
});
assert.sameValue(obj.prop, 10, 'obj.prop');
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