<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/113174>113174</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Deducing this feature missing feature test macro
        </td>
    </tr>

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

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

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

<pre>
    According to https://github.com/llvm/llvm-project/issues/59619, there is no work remaining to add this feature, yet it still lacks a feature test macro which is being worked around like [this](https://github.com/llvm/llvm-project/blob/a2ba438f3e5635e368333213914c7452a6a6a2da/libcxx/include/__config#L1228) in libcxx.

The release notes for clang 18.1 had this to say:

> Because the support for this feature is still experimental, the feature test macro __cpp_explicit_this_parameter was not set in this version. However, its support can be tested with __has_extension(cxx_explicit_this_parameter).

If this feature is complete, the feature test macro should be added. If it is incomplete, there should be an issue to point to describing the remaining work.
</pre>
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