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      <base href="https://bugs.webkit.org/" />
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        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - We should treat structures that vary solely in their prototype as a single polymorphic type."
   href="https://bugs.webkit.org/show_bug.cgi?id=150983">150983</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>We should treat structures that vary solely in their prototype as a single polymorphic type.
          </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>JavaScriptCore
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>keith_miller&#64;apple.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Consider the following code:

function foo()
    function Bar(x) {
        this.x = x;
    }

    return new Bar(1);
}

Every time foo() is called the returned value will have a different prototype. At some point, probably the second time we construct a new Bar() we should convert the structure into a new one that instead indicates we should get the prototype off the object itself rather than off the structure. This would prevent inline caches from becoming megamorphic.</pre>
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      </p>
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