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    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Compile fails when using enum declaration"
   href="https://bugs.llvm.org/show_bug.cgi?id=52403">52403</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Compile fails when using enum declaration
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>13.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>C++2a
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>n.makhsudyan@yahoo.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>According to C++20 standard the following code is valid, however it doesn't
compile with clang13:

enum class Pig { Oink };
using Hog = Pig;
using enum Hog;


Output:

<source>:3:12: error: type alias 'Hog' cannot be referenced with a enum
specifier
using enum Hog;
           ^
<source>:2:7: note: declared here
using Hog = Pig;
      ^
1 error generated.
Compiler returned: 1


Obligatory godbolt link:
<a href="https://gcc.godbolt.org/z/413defY1q">https://gcc.godbolt.org/z/413defY1q</a></pre>
        </div>
      </p>


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