<html>
    <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 --- - Unknown builtin type! UNREACHABLE executed at ASTContext.cpp:1683!"
   href="https://llvm.org/bugs/show_bug.cgi?id=31822">31822</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Unknown builtin type! UNREACHABLE executed at ASTContext.cpp:1683!
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </td>
        </tr>

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

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

        <tr>
          <th>OS</th>
          <td>Windows NT
          </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>new bugs
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>yaron.keren@gmail.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>dblaikie@gmail.com, llvm-bugs@lists.llvm.org
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>clang version 5.0.0 (trunk 293644)
clang -c -std=c++11 of:

struct stringer_for {
  stringer_for(int);
};
template <typename Args> void do_log(Args &&args) {
  [](auto &&) {}(stringer_for(args));
}
void foo() { do_log(2); }</pre>
        </div>
      </p>
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