[Bug c++/33118] New: [4.3 Regression] #'argument_pack_select' not supported by dump_expr#<expression error>

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

Testcase:
template <typename _Tp>
struct __add_const_lvalue_reference;
template<typename... _Elements>
class tuple
{
  tuple(typename __add_const_lvalue_reference<_Elements>::type ...) ;
};
tuple<int&, int&, int&> i;

--------- CUT -----
Found while cutting down PR 33091.  This is a regression because the error
message was ok in 4.2.0 and before.
On the trunk we get:
t.cc: In instantiation of 'tuple<#'argument_pack_select' not supported by
dump_expr#<expression error> >':
t.cc:8:   instantiated from here
t.cc:6: error: invalid use of incomplete type 'struct
__add_const_lvalue_reference<int&>'


-- 
           Summary: [4.3 Regression] #'argument_pack_select' not supported
                    by dump_expr#<expression error>
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33118