<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/148546>148546</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            swap overload for observer_ptr is not constexpr
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    https://github.com/llvm/llvm-project/blob/cac806bcc5b3367ca7573c2c5ae590379d89b84f/libcxx/test/std/experimental/memory/memory.observer.ptr/swap.pass.cpp#L54

This test checks that swap is constexpr, which is not the case in the TS:
https://cplusplus.github.io/fundamentals-ts/v3.html#memory.observer.ptr.special

Is this testing an extension?
</pre>
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