markus@x4 tmp % cat subprocess.ii
namespace std {
template <typename _Tp, _Tp> struct integral_constant {
  static constexpr _Tp value = 0;
};
template <typename> struct conditional;
template <typename...> struct __or_;
template <typename _B1, typename _B2>
struct __or_<_B1, _B2> : conditional<_B2>::type {};
template <typename> struct is_enum : integral_constant<bool, __is_enum(int)> {};
template <typename> struct remove_reference;
template <typename _Tp> struct remove_reference<_Tp &> { typedef _Tp type; };
template <typename _Tp> struct decay {
  typedef typename remove_reference<_Tp>::type type;
};
template <typename> struct conditional { typedef is_enum<char> type; };
template <typename _Head> struct _Head_base { _Head _M_head_impl; };
template <unsigned long, typename...> struct _Tuple_impl;
template <unsigned long _Idx, typename _Head, typename... _Tail>
struct _Tuple_impl<_Idx, _Head, _Tail...> : _Tuple_impl<1, _Tail...>,
                                            _Head_base<_Head> {
  _Tuple_impl(_Tuple_impl &) = default;
  _Tuple_impl(_Tuple_impl &&__in) : _Tuple_impl(__in) {}
};
template <unsigned long _Idx, typename _Head>
struct _Tuple_impl<_Idx, _Head> {};
template <typename... _Elements> struct tuple : _Tuple_impl<0, _Elements...> {};
template <typename> struct _Bind;
template <typename _Functor, typename... _Bound_args>
struct _Bind<_Functor(_Bound_args...)> {
  tuple<_Bound_args...> _M_bound_args;
};
template <typename _Tp, typename _Tp2 = typename decay<_Tp>::type>
using __is_socketlike = __or_<integral_constant<bool, false>, is_enum<_Tp2>>;
template <int, typename... _BoundArgs> struct _Bind_helper {
  typedef _Bind<int(typename decay<_BoundArgs>::type...)> type;
};
template <typename _Func, typename... _BoundArgs>
typename _Bind_helper<__is_socketlike<_Func>::value, _BoundArgs...>::type
bind(_Func &&, _BoundArgs &&...);
struct _Any_data {
  template <typename _Tp> _Tp _M_access() const;
};
enum _Manager_operation {};
template <typename> struct function;
struct _Function_base {
  template <typename _Functor> struct _Base_manager {
    static bool _M_manager(_Any_data &, const _Any_data &__source,
                           _Manager_operation) {
      _Functor(*__source._M_access<_Functor *>());
    }
  };
  typedef bool (*_Manager_type)(_Any_data &, const _Any_data &,
                                _Manager_operation);
  _Manager_type _M_manager;
};
template <typename, typename> struct _Function_handler;
template <typename _Res, typename _Functor, typename... _ArgTypes>
struct _Function_handler<_Res(_ArgTypes...), _Functor>
    : _Function_base::_Base_manager<_Functor> {};
template <typename _Res, typename... _ArgTypes>
struct function<_Res(_ArgTypes...)> : _Function_base {
  template <typename, typename> using _Requires = int;
  template <typename _Functor, typename = _Requires<int, void>,
            typename = _Requires<int, void>>
  function(_Functor);
  _Res operator()(_ArgTypes...);
};
template <typename _Res, typename... _ArgTypes>
template <typename _Functor, typename, typename>
function<_Res(_ArgTypes...)>::function(_Functor) {
  _M_manager = _Function_handler<_Res(), _Functor>::_M_manager;
}
}
struct Option {
  Option(Option &);
};
using std::bind;
using std::function;
struct Subprocess {};
using InputFileDescriptors = Subprocess;
using OutputFileDescriptors = int;
void defaultClone(Option setup) {
  InputFileDescriptors stdinfds;
  OutputFileDescriptors stdoutfds, envp;
  function<int(function<int()>)> clone = 0;
  int pipes = clone(bind(envp, setup, stdinfds, stdoutfds, pipes));
}

markus@x4 tmp % g++ -c subprocess.ii
subprocess.ii: In copy constructor ‘std::_Tuple_impl<_Idx, _Head, _Tail ...>::_Tuple_impl(std::_Tuple_impl<_Idx, _Head, _Tail ...>&) [with long unsigned int _Idx = 0ul; _Head = Option; _Tail = {Subprocess, int, int}]’:
subprocess.ii:21:3: internal compiler error: in assign_temp, at function.c:961
   _Tuple_impl(_Tuple_impl &) = default;
   ^~~~~~~~~~~
0xa51353 assign_temp(tree_node*, int, int)
        ../../gcc/gcc/function.c:961
0x9e9e25 expand_expr_real_1(tree_node*, rtx_def*, machine_mode, expand_modifier, rtx_def**, bool)
        ../../gcc/gcc/expr.c:10408
0x9f9048 expand_normal
        ../../gcc/gcc/expr.h:262
0x9f9048 store_field
        ../../gcc/gcc/expr.c:6679
0x9f4c7d expand_assignment(tree_node*, tree_node*, bool)
        ../../gcc/gcc/expr.c:5021
0x8e79de expand_gimple_stmt_1
        ../../gcc/gcc/cfgexpand.c:3606
0x8e79de expand_gimple_stmt
        ../../gcc/gcc/cfgexpand.c:3702
0x8e9e88 expand_gimple_basic_block
        ../../gcc/gcc/cfgexpand.c:5708
0x8efe96 execute
        ../../gcc/gcc/cfgexpand.c:6323