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    <body><span class="vcard"><a class="email" href="mailto:sbarati&#64;apple.com" title="Saam Barati &lt;sbarati&#64;apple.com&gt;"> <span class="fn">Saam Barati</span></a>
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              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ES6] Arrow function. Default arguments in arrow functions"
   href="https://bugs.webkit.org/show_bug.cgi?id=152537">bug 152537</a>
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           <td style="text-align:right;">Attachment #269480 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 - [ES6] Arrow function. Default arguments in arrow functions"
   href="https://bugs.webkit.org/show_bug.cgi?id=152537#c3">Comment # 3</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - [ES6] Arrow function. Default arguments in arrow functions"
   href="https://bugs.webkit.org/show_bug.cgi?id=152537">bug 152537</a>
              from <span class="vcard"><a class="email" href="mailto:sbarati&#64;apple.com" title="Saam Barati &lt;sbarati&#64;apple.com&gt;"> <span class="fn">Saam Barati</span></a>
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        <pre>Comment on <span class=""><a href="attachment.cgi?id=269480&amp;action=diff" name="attach_269480" title="Patch">attachment 269480</a> <a href="attachment.cgi?id=269480&amp;action=edit" title="Patch">[details]</a></span>
Patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=269480&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=269480&amp;action=review</a>

<span class="quote">&gt; LayoutTests/js/script-tests/arrowfunction-syntax.js:90
&gt; +shouldBe(&quot;((x, y = 'default-value') =&gt; x + y)('input-value:')&quot;,'&quot;input-value:default-value&quot;');</span >

you should add a test where you pass in:
- &quot;undefined&quot; for y
- anything that isn't undefined for y</pre>
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