<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63740>63740</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Regression(6bad76c7ae93a94f): `llvm-undname --warn-trailing` is broken
        </td>
    </tr>

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

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

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

<pre>
    Expected:

```sh
% out/gn/bin/llvm-undname --warn-trailing '.?AVNet@@'
.?AVNet@@
class Net `RTTI Type Descriptor Name'
```

Actual:

```sh
% out/gn/bin/llvm-undname --warn-trailing '.?AVNet@@'
.?AVNet@@
class Net `RTTI Type Descriptor Name'
warning: trailing characters: .?AVNet@@
```


Bisected to 6bad76c7ae93a94fbac39db08fee23ce46d97fdb

@nickdesaulniers 
</pre>
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