<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/103016>103016</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            CTAD:  Don't ignore explicit deduction guides defined after the first use of the alias template
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang:frontend
      </td>
    </tr>

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

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

<pre>
    For alias CTAD, if an explicit deduction guide is written after the first use of the alias template, this deduction guide is not included. 
The upcoming CTAD for inherited constructors (#98788) also has the same limitation.

See the test in [clang/test/SemaCXX/cxx20-ctad-type-alias.cpp.](https://github.com/llvm/llvm-project/blob/main/clang/test/SemaCXX/cxx20-ctad-type-alias.cpp#L224-L242)
</pre>
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