<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/61048>61048</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang format: Dry-run fails without expected changes
        </td>
    </tr>

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

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

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

<pre>
    The following code keeps giving failures, even after reformatting.
Found on 16-rc2, looks like a possible release blocker?
````
class C
{
   C(size_t nr = 1'000) {}
};
````

Failure message:
````
test.cpp:3:18: warning: code should be clang-formatted [-Wclang-format-violations]
   C(size_t nr = 1'000) {}
 ^
````

[reproduction.zip](https://github.com/llvm/llvm-project/files/10850414/reproduction.zip)

</pre>
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