<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/60048>60048</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [clang-tidy] `modernize-concat-nested-namespaces`'s fix-it removes attributes
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          v1nh1shungry
      </td>
    </tr>
</table>

<pre>
    ```cpp
namespace a {
namespace [[deprecated]] b {
}
}
```

after applying the fix-it,

```cpp
namespace a::b {
}
```

The `[[deprecated]]` attribute is removed.
</pre>
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