p0188r1">P0188R1</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
    <tr>
      <td rowspan="2"><tt>[[nodiscard]]</tt> attribute</td>
      <td><a href="https://wg21.link/p0189r1">P0189R1</a></td>
      <td class="full" align="center">Clang 3.9</td>
    </tr>
      <tr> <!-- from Cologne 2019 -->
        <td><a href="https://wg21.link/p1771r1">P1771R1</a> (<a href="#dr">DR</a>)</td>
        <td class="full" align="center">Clang 9</td>
      </tr>
    <tr>
      <td><tt>[[maybe_unused