<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/149008>149008</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [C++][Module] Improve diagnostic 'export declaration can only be used within a module purview'
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            c++20,
            clang:modules
      </td>
    </tr>

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

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

<pre>
    ```cpp
module M; // #M

export int b2; // expected-error {{export declaration can only be used within a module purview}}

```

As Michael's suggestion in https://github.com/llvm/llvm-project/pull/148861#discussion_r2208847734, This should say "within the purview of a module interface" for this case, or just "within a module interface" to be less pedantic.
</pre>
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