[Webkit-unassigned] [Bug 215974] Wrong error message of the spread.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=215974

Darin Adler <darin at apple.com> changed:

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--- Comment #8 from Darin Adler <darin at apple.com> ---
Comment on attachment 408597
  --> https://bugs.webkit.org/attachment.cgi?id=408597
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=408597&action=review

>> Source/JavaScriptCore/runtime/CommonSlowPaths.cpp:1577
>> +        if (UNLIKELY(scope.exception())) {
> 
> We can't override an exception as it won't necessarily be an unhelpful "undefined is not a function" one; it could be a userland-thrown error.
> Instead, we should fix `iterationFunction`, which is defined in Source/JavaScriptCore/builtins/IteratorHelpers.js.
> While we do that, we need to make sure Symbol.iterator is looked up only once.

So it seems we need multiple tests to show our correct handling of these different cases.

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