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    <head>
      <base href="https://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 --- - ICE in frontend"
   href="https://llvm.org/bugs/show_bug.cgi?id=31422">31422</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>ICE in frontend
          </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>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>Frontend
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>bbannier@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=17768" name="attach_17768" title="reproducer">attachment 17768</a> <a href="attachment.cgi?id=17768&action=edit" title="reproducer">[details]</a></span>
reproducer

I came across the attached segfault when compiling the following incorrect
program in C++1z mode,

    template <typename F> struct S {
      T f;
      template <typename... Ts> operator auto()(Ts &&... xs) const { return
f(xs...); }
    };

I would expect clang to just reject the program, e.g., with the existing error
message, instead of segfaulting.</pre>
        </div>
      </p>
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