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

[bugzilla-daemon at webkit.org]

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

--- Comment #7 from Alexey Shvayka <shvaikalesh at gmail.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

Thank you for submitting the patch. I've left a comment on the approach.

> 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.

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