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    <body><span class="vcard"><a class="email" href="mailto:keith_miller&#64;apple.com" title="Keith Miller &lt;keith_miller&#64;apple.com&gt;"> <span class="fn">Keith Miller</span></a>
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              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ESNext] Support trailing commas in function param lists"
   href="https://bugs.webkit.org/show_bug.cgi?id=158020">bug 158020</a>
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          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
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           <td style="text-align:right;">Attachment #279795 Flags</td>
           <td>review?, commit-queue?
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           <td>review+, commit-queue-
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ESNext] Support trailing commas in function param lists"
   href="https://bugs.webkit.org/show_bug.cgi?id=158020#c15">Comment # 15</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ESNext] Support trailing commas in function param lists"
   href="https://bugs.webkit.org/show_bug.cgi?id=158020">bug 158020</a>
              from <span class="vcard"><a class="email" href="mailto:keith_miller&#64;apple.com" title="Keith Miller &lt;keith_miller&#64;apple.com&gt;"> <span class="fn">Keith Miller</span></a>
</span></b>
        <pre>Comment on <span class=""><a href="attachment.cgi?id=279795&amp;action=diff" name="attach_279795" title="Patch">attachment 279795</a> <a href="attachment.cgi?id=279795&amp;action=edit" title="Patch">[details]</a></span>
Patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=279795&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=279795&amp;action=review</a>

r=me with comments.

<span class="quote">&gt; Source/JavaScriptCore/tests/stress/trailing-comma-in-function-paramters.js:54
&gt; +test(eval('(function(a, b, c){ return a + b + c; })(&quot;A&quot;, &quot;B&quot;, &quot;C&quot;,)'), 'ABC');</span >

I think it would also be useful to add the following tests:

test((function(a,) { return arguments.length; })(), 1);
test((function(a,) { }).length, 1);</pre>
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