 <tr>
      <td>Alias templates</td>
      <td><a href="https://wg21.link/n2258">N2258</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Extern templates</td>
      <td><a href="https://wg21.link/n1987">N1987</a></td>
      <td class="full" align="center">Clang 2.9</td>
    </tr>
    <tr>
      <td>Null pointer constant</td>
      <td><a href="https://wg21.link/n2431">N2431</a></td>
      <td class="full" align="center">Clang 3.0</td>
    </tr>
    <tr>
      <td>Str