Comment #9 on issue 4307 by ad...@chromium.org: Implement well-known symbol
`Symbol.toPrimitive`
https://code.google.com/p/v8/issues/detail?id=4307
The ES6 version of ToPrimitive does not play nicely with access-checked
objects (similar to issue 4289 with @@isConcatSpreadable). The following
test case prints PASS before this change and FAIL after it:
<div id="output"></div>
<script>
function run() {
var obj = {'[object Window]': 'PASS: No exception'};
var crossOriginWindow = frames[0];
var output = document.getElementById('output');
try {
output.textContent = obj[crossOriginWindow];
} catch (e) {
output.textContent = 'FAIL: Got an exception: ' + e;
}
}
</script>
<iframe src="http://example.com/"; onload="run()" hidden></iframe>
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