[Bug c++/42702] New: Unimplemented functionality

[piotr dot wyderski at gmail dot com]

g++ -std=gnu++0x -c -O2

prints:

minimal.cpp:8:44: sorry, unimplemented: cannot expand '_Tail ...' into a
fixed-l
ength argument list

reduced testcase:

  template<typename _Tp>
    class tuple<>
    {
        {
 }
  template<std::size_t __i, typename _Head, typename... _Tail>
    struct tuple_element<__i, tuple<_Head, _Tail...> >
    : tuple_element<__i - 1, tuple<_Tail...> > { };


-- 
           Summary: Unimplemented functionality
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: piotr dot wyderski at gmail dot com
  GCC host triplet: Cygwin/GCC-trunk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42702