<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 C++ partial specialization of nested template (reject valid)"
   href="http://llvm.org/bugs/show_bug.cgi?id=20570">20570</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>clang C++ partial specialization of nested template (reject valid)
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>3.4
          </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>reagentoo@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>Bug appears when you try to specialize template within another template.

Minimal snippet:
=============================
template <class>
struct Foo
{
    template <class>
    struct Bar;
};

template <class T>
template <>
struct Foo<T>::Bar<int>
{};
=============================

However, if you add an one additional (undeductional) parameter in the
specialization, the code is compiled. "template <class>" instead of "template
<>".

Minimal snippet (is working):
=============================
template <class>
struct Foo
{
    template <class>
    struct Bar;
};

template <class T>
template <class>
struct Foo<T>::Bar<int>
{};
=============================</pre>
        </div>
      </p>
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      <ul>
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