[Bug c++/38646] New: [4.3/4.4 regression] ICE with invalid specialization of variadic template

["reichelt at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The following invalid code snippet triggers an ICE since GCC 4.3.0:

=============================================
template<int...> struct A;

template<int... N> struct A<N..., N...>
{
  template<typename> struct B;

  template<typename T> struct B<T*> {};
};
=============================================

bug.cc:3: error: parameter pack argument 'N ...' must be at the end of the
template argument list
bug.cc:7: internal compiler error: tree check: expected class 'type', have
'exceptional' (error_mark) in template_class_depth, at cp/pt.c:314
Please submit a full bug report, [etc.]


-- 
           Summary: [4.3/4.4 regression] ICE with invalid specialization of
                    variadic template
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code, error-recovery, monitored
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38646