
    <tr>
      <td><tt>[[nodiscard("with reason")]]</tt></td>
      <td><a href="https://wg21.link/p1301r4">P1301R4</a></td>
      <td class="full" align="center">Clang 9</td>
    </tr>
    <tr>
      <td><tt>using enum</tt></td>
      <td><a href="https://wg21.link/p1099r5">P1099R5</a></td>
      <td class="full" align="center">Clang 13</td>
    </tr>
    <tr>
      <td rowspan=2>Class template argument deduction for aggregates</td>
      <td><a href="https://wg21.link/p1816r0">P1816R0</a></td>
      <td 