<html>
    <head>
      <base href="http://llvm.org/bugs/" />
    </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 --- - clang says a used variable is unused"
   href="http://llvm.org/bugs/show_bug.cgi?id=17897">17897</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>clang says a used variable is unused
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

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

        <tr>
          <th>OS</th>
          <td>All
          </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>rafael.espindola@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Clang says flow is not used, but commenting it changes the value of foobarzed.

namespace {
struct foo {};
}
template <typename T, T> struct SameType;
template <class T> struct has_FlowTraits2 {
  struct Fallback {
    bool flow;
  };
  struct Derived : T, Fallback {};
  template <typename C>
  static char (&f(SameType<bool Fallback::*, &C::flow> *))[1];
  template <typename C> static char (&f(...))[2];
  static bool const value = sizeof(f<Derived>(0)) == 2;
};
template <typename T> struct SequenceTraits2 {};
template <> struct SequenceTraits2<foo> {
  static const bool flow = true; // HERE
};
bool foobarzed = has_FlowTraits2<SequenceTraits2<foo> >::value;</pre>
        </div>
      </p>
      <hr>
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      <ul>
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