g21.link/p0840r2">P0840R2</a></td>
      <td class="full" align="center">Clang 9</td>
    </tr>
    <tr>
      <td><tt>[[likely]]</tt> and <tt>[[unlikely]]</tt> attributes</td>
      <td><a href="https://wg21.link/p0479r5">P0479R5</a></td>
      <td class="none" align="center">Clang 12 (partial)</td>
    </tr>
    <tr>
      <td><tt>typename</tt> optional in more contexts</td>
      <td><a href="https://wg21.link/p0634r3">P0634R3</a></td>
      <td class="none" align="center">No</td>
    </tr>
    <tr>
    