<html>
    <head>
      <base href="http://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 --- - clang incorrectly deduces template parameter pack"
   href="http://llvm.org/bugs/show_bug.cgi?id=21536">21536</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>clang incorrectly deduces template parameter pack
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>3.5
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </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>C++11
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>hui.li@me.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>Clang 3.5 is unable to compile the following code:

template < typename, typename... >
struct X {};

template < typename... T >
void foo(const X<T...>&)
{}

int main()
{
   X<int,int> x;
   foo(x);
}


The error I got reads:

t.cpp:11:4: error: no matching function for call to 'foo'
   foo(x);
   ^~~
t.cpp:5:6: note: candidate template ignored: substitution failure [with T =
<>]: too few template arguments for class template 'X'
void foo(const X<T...>&)
     ^         ~
1 error generated.


GCC 4.8.3 is able to compile this code.</pre>
        </div>
      </p>
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