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    <body><span class="vcard"><a class="email" href="mailto:rniwa&#64;webkit.org" title="Ryosuke Niwa &lt;rniwa&#64;webkit.org&gt;"> <span class="fn">Ryosuke Niwa</span></a>
</span> changed
              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Fix unit test and bug fix for 'pull-os-versions.js' script."
   href="https://bugs.webkit.org/show_bug.cgi?id=169701">bug 169701</a>
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            <th>What</th>
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           <td style="text-align:right;">Attachment #304609 Flags</td>
           <td>review?
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           <td>review+
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Fix unit test and bug fix for 'pull-os-versions.js' script."
   href="https://bugs.webkit.org/show_bug.cgi?id=169701#c4">Comment # 4</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Fix unit test and bug fix for 'pull-os-versions.js' script."
   href="https://bugs.webkit.org/show_bug.cgi?id=169701">bug 169701</a>
              from <span class="vcard"><a class="email" href="mailto:rniwa&#64;webkit.org" title="Ryosuke Niwa &lt;rniwa&#64;webkit.org&gt;"> <span class="fn">Ryosuke Niwa</span></a>
</span></b>
        <pre>Comment on <span class=""><a href="attachment.cgi?id=304609&amp;action=diff" name="attach_304609" title="Patch">attachment 304609</a> <a href="attachment.cgi?id=304609&amp;action=edit" title="Patch">[details]</a></span>
Patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=304609&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=304609&amp;action=review</a>

<span class="quote">&gt; Websites/perf.webkit.org/tools/pull-os-versions.js:33
&gt; +            return promise.then(() =&gt; {return fetcher.fetchAndReportNewBuilds();});</span >

I think you can just do () =&gt; fetcher.fetchAndReportNewBuilds().</pre>
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