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    <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 - segfault instead of an error with an invalid code"
   href="https://bugs.llvm.org/show_bug.cgi?id=40970">40970</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>segfault instead of an error with an invalid code
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>8.0
          </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>enhancement
          </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>jonathan.poelen@gmail.com
          </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>Created <span class=""><a href="attachment.cgi?id=21565" name="attach_21565" title="backtrace">attachment 21565</a> <a href="attachment.cgi?id=21565&action=edit" title="backtrace">[details]</a></span>
backtrace

struct A
{
    template<class... Ts>
    using check_printf_result = int;
};

template<class T, class... Ts>
// typename T::template check_printf_result<Ts...>
decltype(T::template check_printf_result<Ts...>) // crash instead of an error
foo(T k);

int main()
{
    foo(A{});
}</pre>
        </div>
      </p>


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