<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 --- - No diagnostic for function parameter pack with default argument"
   href="https://llvm.org/bugs/show_bug.cgi?id=23028">23028</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>No diagnostic for function parameter pack with default argument
          </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>Linux
          </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>oktal3700@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>Ubuntu clang version 3.7.0-svn229234-1~exp1 and in earlier versions.

The following (ill formed) code is accepted by clang: <a href="http://goo.gl/jKa8Q7">http://goo.gl/jKa8Q7</a>

template <typename... Ts>
void f(Ts... = 0) {}

int main() {
  f(42);
}

8.3.6/3: A default argument shall not be specified for a parameter pack.

>From <a href="http://stackoverflow.com/q/29098835/1639256">http://stackoverflow.com/q/29098835/1639256</a></pre>
        </div>
      </p>
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