<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63543>63543</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            "explicit specialization cannot have a storage class" diagnostic lacks a diagnostic flag but is disableable
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          Th3T3chn0G1t
      </td>
    </tr>
</table>

<pre>
    The `warning: explicit specialization cannot have a storage class` diagnostic is issued without an accompanying diagnostic flag. However when compiling with `-Wno-everything` it is disabled, suggesting that it does behave like a regular diagnostic.

I'd expect the diagnostic to print out its flag like all other warnings, or that it have a flag in the first place if there isn't one.

Example output:

I am on Linux though the same behaviour is exhibited by Apple Clang 12.

`clang -v`
```
clang version 15.0.7
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-pc-linux-gnu/13.1.1
Found candidate GCC installation: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/13.1.1
Selected GCC installation: /usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/13.1.1
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
```
</pre>
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