<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - -Wunused-private-field on member accessed via template parameter"
   href="https://bugs.llvm.org/show_bug.cgi?id=47717">47717</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>-Wunused-private-field on member accessed via template parameter
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>trunk
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>C++
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>ed@catmur.co.uk
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>#include <concepts>
class C {
    int i; // warning: private field 'i' is not used [-Wunused-private-field]
public:
    int f(std::derived_from<C> auto& other) { return ++other.i; }
};
<a href="https://godbolt.org/z/zoYKc7">https://godbolt.org/z/zoYKc7</a>
clang version 12.0.0 (<a href="https://github.com/llvm/llvm-project.git">https://github.com/llvm/llvm-project.git</a>
88c9162c9d47ef43a505bc5301dc626f3cd4f437)

Not sure whether this is valid, but it'd be nice if this was regarded as a
possible use of C::i.

nb. the derived_from is not necessary to exhibit the issue, but demonstrates
motivation.</pre>
        </div>
      </p>


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