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    <head>
      <base href="http://llvm.org/bugs/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - Nested Variadic Expansions in generic lambdas don't work"
   href="http://llvm.org/bugs/show_bug.cgi?id=18499">18499</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Nested Variadic Expansions in generic lambdas don't work
          </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>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>C++1y
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>faisalv@yahoo.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvmbugs@cs.uiuc.edu
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr></table>
      <p>
        <div>
        <pre>This code results in a crash:

auto K = [](auto ... OuterArgs) {
      vp([=](auto ... Is) {
          decltype(OuterArgs) OA = OuterArgs;
          return 0;
        }(5)...);
      return 0;
    };

 auto M = K('a', ' ', 1, " -- ", 3.14);

Assertion failed: !Unexpanded.empty() && "Unable to find unexpanded parameter
packs", file \llvm\tools\clang\lib\Sema\SemaTemplateVariadic.cpp, line 281

If this is prioritized as important enough to fix, a patch that is in the
works, can be moved up in my queue :)</pre>
        </div>
      </p>
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