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      <base href="https://bugs.webkit.org/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Calling async arrow function which is in a class's member function will cause error"
   href="https://bugs.webkit.org/show_bug.cgi?id=166879">166879</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Calling async arrow function which is in a class's member function will cause error
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>WebKit
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>WebKit Nightly Build
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>Normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P2
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>JavaScriptCore
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>webkit-unassigned&#64;lists.webkit.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>hszhsh&#64;icloud.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>The test code is as follows. When I run the code, I got the error “Can't find private variable: &#64;derivedConstructor”.

function doSomething(callback) {
    callback();
}

class Test {
    testFunc() {
        doSomething(async () =&gt; {
            console.log(&quot;testFunc&quot;);
            await sleep(2);
            console.log(&quot;testFunc end&quot;);
        });
    }
}

let test = new Test();
test.testFunc();</pre>
        </div>
      </p>
      <hr>
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      <ul>
          <li>You are the assignee for the bug.</li>
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