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    <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 --- - Bogus error when calling variadic template member function"
   href="http://llvm.org/bugs/show_bug.cgi?id=15575">15575</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Bogus error when calling variadic template member function
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>trunk
          </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>zeratul976@hotmail.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>For the following code:


struct blank {};

template <typename T>
struct result_builder
{
    template <typename... Blanks>
    void apply(Blanks... blanks);
};

template <typename T>
void waldo()
{
    result_builder<T> r;
    typedef decltype(r.apply(blank{})) wally;
};

int main()
{
    waldo<int>();
}


clang (r177790) gives the following compiler error:


test.cpp:131:24: error: no matching member function for call to 'apply'
    typedef decltype(r.apply(blank{})) wally;
                     ~~^~~~~
test.cpp:136:5: note: in instantiation of function template specialization 'wal
    waldo<int>();
    ^
test.cpp:124:10: note: candidate function not viable: requires 0 arguments, but
    void apply(Blanks... blanks);
         ^


I believe this code is valid. It compiles with GCC.</pre>
        </div>
      </p>
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