<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/57659>57659</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang: using enum tdef rejected
        </td>
    </tr>

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

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

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

<pre>
    DR2621  notes implementation divergence for:
```
enum class E {
  a, b, c
};

using MyE = E;

int main() {
  using enum MyE;   // #1
}
```
clang++ -std=c++20 -c x.cc
x.cc:8:14: error: type alias 'MyE' cannot be referenced with a enum specifier
  using enum MyE;   // #1
             ^
x.cc:5:7: note: declared here
using MyE = E;
      ^
(gcc, EDG, MSVC accept).  It should be accepted.
</pre>
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