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#include <iostream>
#include <vector>
#include <unordered_set>
using namespace std;
struct A;
struct B;
 
using CA = std::vector< A >;
using CB = std::unordered_set< B >;
 
 
struct A
{
    int payload;
    typename CB::iterator pb; // hard error here
};
 
struct B
{
    double payload;
    typename CA::iterator pa;
};
int main() {
	A a;
	B b;
	return 0;
}

In file included from /usr/include/c++/5/bits/hashtable.h:35:0,
                 from /usr/include/c++/5/unordered_set:47,
                 from prog.cpp:3:
/usr/include/c++/5/bits/hashtable_policy.h: In instantiation of 'struct std::__detail::__is_noexcept_hash<B, std::hash<B> >':
/usr/include/c++/5/type_traits:137:12:   required from 'struct std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > >'
/usr/include/c++/5/type_traits:148:38:   required from 'struct std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
/usr/include/c++/5/bits/unordered_set.h:95:63:   required from 'class std::unordered_set<B>'
prog.cpp:15:16:   required from here
/usr/include/c++/5/bits/hashtable_policy.h:85:34: error: no match for call to '(const std::hash<B>) (const B&)'
  noexcept(declval<const _Hash&>()(declval<const _Key&>()))>
                                  ^
In file included from /usr/include/c++/5/bits/move.h:57:0,
                 from /usr/include/c++/5/bits/stl_pair.h:59,
                 from /usr/include/c++/5/bits/stl_algobase.h:64,
                 from /usr/include/c++/5/bits/char_traits.h:39,
                 from /usr/include/c++/5/ios:40,
                 from /usr/include/c++/5/ostream:38,
                 from /usr/include/c++/5/iostream:39,
                 from prog.cpp:1:
/usr/include/c++/5/type_traits: In instantiation of 'struct std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >':
/usr/include/c++/5/bits/unordered_set.h:95:63:   required from 'class std::unordered_set<B>'
prog.cpp:15:16:   required from here
/usr/include/c++/5/type_traits:148:38: error: 'value' is not a member of 'std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > >'
     : public integral_constant<bool, !_Pp::value>
                                      ^
In file included from /usr/include/c++/5/unordered_set:48:0,
                 from prog.cpp:3:
/usr/include/c++/5/bits/unordered_set.h: In instantiation of 'class std::unordered_set<B>':
prog.cpp:15:16:   required from here
/usr/include/c++/5/bits/unordered_set.h:95:63: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef __uset_hashtable<_Value, _Hash, _Pred, _Alloc>  _Hashtable;
                                                               ^
/usr/include/c++/5/bits/unordered_set.h:102:45: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::key_type key_type;
                                             ^
/usr/include/c++/5/bits/unordered_set.h:103:47: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::value_type value_type;
                                               ^
/usr/include/c++/5/bits/unordered_set.h:104:43: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::hasher hasher;
                                           ^
/usr/include/c++/5/bits/unordered_set.h:105:46: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::key_equal key_equal;
                                              ^
/usr/include/c++/5/bits/unordered_set.h:106:51: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::allocator_type allocator_type;
                                                   ^
/usr/include/c++/5/bits/unordered_set.h:111:45: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::pointer  pointer;
                                             ^
/usr/include/c++/5/bits/unordered_set.h:112:50: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::const_pointer const_pointer;
                                                  ^
/usr/include/c++/5/bits/unordered_set.h:113:47: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::reference  reference;
                                               ^
/usr/include/c++/5/bits/unordered_set.h:114:52: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::const_reference const_reference;
                                                    ^
/usr/include/c++/5/bits/unordered_set.h:115:46: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::iterator  iterator;
                                              ^
/usr/include/c++/5/bits/unordered_set.h:116:51: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::const_iterator const_iterator;
                                                   ^
/usr/include/c++/5/bits/unordered_set.h:117:51: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::local_iterator local_iterator;
                                                   ^
/usr/include/c++/5/bits/unordered_set.h:118:57: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::const_local_iterator const_local_iterator;
                                                         ^
/usr/include/c++/5/bits/unordered_set.h:119:47: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::size_type  size_type;
                                               ^
/usr/include/c++/5/bits/unordered_set.h:120:52: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       typedef typename _Hashtable::difference_type difference_type;
                                                    ^
/usr/include/c++/5/bits/unordered_set.h:274:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       operator=(initializer_list<value_type> __l)
       ^
/usr/include/c++/5/bits/unordered_set.h:368:2: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
  emplace(_Args&&... __args)
  ^
/usr/include/c++/5/bits/unordered_set.h:412:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       insert(const value_type& __x)
       ^
/usr/include/c++/5/bits/unordered_set.h:416:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       insert(value_type&& __x)
       ^
/usr/include/c++/5/bits/unordered_set.h:471:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       insert(initializer_list<value_type> __l)
       ^
/usr/include/c++/5/bits/unordered_set.h:616:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       equal_range(const key_type& __x)
       ^
/usr/include/c++/5/bits/unordered_set.h:620:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<B> >, std::__detail::__is_noexcept_hash<B, std::hash<B> > > >'
       equal_range(const key_type& __x) const
       ^
prog.cpp:15:18: error: invalid combination of multiple type-specifiers
     typename CB::iterator pb; // hard error here
                  ^

Standard output is empty