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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ES6] Implement ES6 arrow function syntax. Parser of arrow function with execution as common function"
   href="https://bugs.webkit.org/show_bug.cgi?id=144955#c47">Comment # 47</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ES6] Implement ES6 arrow function syntax. Parser of arrow function with execution as common function"
   href="https://bugs.webkit.org/show_bug.cgi?id=144955">bug 144955</a>
              from <span class="vcard"><a class="email" href="mailto:utatane.tea&#64;gmail.com" title="Yusuke Suzuki &lt;utatane.tea&#64;gmail.com&gt;"> <span class="fn">Yusuke Suzuki</span></a>
</span></b>
        <pre>Comment on <span class=""><a href="attachment.cgi?id=254239&amp;action=diff" name="attach_254239" title="Patch">attachment 254239</a> <a href="attachment.cgi?id=254239&amp;action=edit" title="Patch">[details]</a></span>
Patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=254239&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=254239&amp;action=review</a>

I can review (partially) this if it's limited to parser's change. In profiler part, I think I'm not a right reviewer.

<span class="quote">&gt; Source/JavaScriptCore/parser/Parser.cpp:2023
&gt; +    bool doParseConditionalExpression = false;</span >

I think `shouldParseConditionalExpression` is better.

<span class="quote">&gt; Source/JavaScriptCore/parser/Parser.cpp:2027
&gt; +    doParseConditionalExpression = !isArrowFunctionEmptyParamterList();</span >

In isArrowFunctionEmptyPararmeterList, we create SavePoint. So I think the above `createSavevPoint` and SavePoint are duplicate.
Could you change to the implementation that `isArrowFunctionEmptyParamterList` always restore the state?
With that implementation, the above SavePoint is not necessary.</pre>
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