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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Clean binding generated code for attribute setters and getters"
   href="https://bugs.webkit.org/show_bug.cgi?id=150446">150446</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Clean binding generated code for attribute setters and getters
          </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>Unspecified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Unspecified
          </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>WebCore JavaScript
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>youennf&#64;gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>As pointed out by Ossy in <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - IDL functions and attributes should be JSBuiltin by default if interface is marked as JSBuiltinConstructor"
   href="show_bug.cgi?id=150438">bug 150438</a>, the binding generator code for custom attribute getters and/or setters should be fixed:

<span class="quote">&gt; &gt; Source/WebCore/bindings/scripts/test/JS/JSTestJSBuiltinConstructor.cpp:158
&gt; &gt; +EncodedJSValue jsTestJSBuiltinConstructorTestAttributeCustom(ExecState* state, JSObject* slotBase, EncodedJSValue thisValue, PropertyName)
&gt; &gt; +{
&gt; &gt; +    UNUSED_PARAM(state);
&gt; &gt; +    UNUSED_PARAM(slotBase);
&gt; &gt; +    UNUSED_PARAM(thisValue);
&gt; &gt; +    auto* castedThis = jsCast&lt;JSTestJSBuiltinConstructor*&gt;(slotBase);
&gt; &gt; +    return JSValue::encode(castedThis-&gt;testAttributeCustom(*state));
&gt; &gt; +}
&gt; 
&gt; state and slotBase parameters are used. thisValue is really unused, 
&gt; but in this case omitting the parameter name would be better.</span ></pre>
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