[Webkit-unassigned] [Bug 147742] [ES6] Implement ES6 arrow function syntax. Prototype of arrow function should be undefined

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=147742

Filip Pizlo <fpizlo at apple.com> changed:

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--- Comment #4 from Filip Pizlo <fpizlo at apple.com> ---
Comment on attachment 259456
  --> https://bugs.webkit.org/attachment.cgi?id=259456
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=259456&action=review

> Source/JavaScriptCore/runtime/JSArrowFunction.cpp:70
> +    removeDirect(vm, vm.propertyNames->prototype);

This is not necessary, and it's also quite wrong.  It's quite bad to remove properties; it puts the object into a conservative (i.e. slow) mode.  Also, there is no way for the object to have a "prototype" property at this point, since it's added lazily.

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