<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/94364>94364</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Does libc++'s span have a non-standard converting constructor?
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc++
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          ldionne
      </td>
    </tr>
</table>

<pre>
    I just came across these constructors which I can't find anywhere in the Standard: https://github.com/llvm/llvm-project/blob/492417278d986ddd8206b2b9bba626ce690ea244/libcxx/include/span#L296-L303

Are they non-standard constructors we provide?

Also, it is possible that the constructor at line 297 is missing a `noexcept` (thanks @mclow for the heads up).
</pre>
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