./serialize.h:631:44: warning: loop variable 'elem' is always a copy because the range of type 'const
      std::vector<bool, std::allocator<bool> >' does not return a reference [-Wrange-loop-analysis]
        for (const typename V::value_type& elem : v) {
                                           ^
./serialize.h:484:77: note: in instantiation of function template specialization
      'VectorFormatter<DefaultFormatter>::Ser<CHashWriter, std::vector<bool, std::allocator<bool> > >'
      requested here
    template<typename Stream> void Serialize(Stream &s) const { Formatter().Ser(s, m_object); }
                                                                            ^
./serialize.h:806:7: note: in instantiation of function template specialization
      'Wrapper<VectorFormatter<DefaultFormatter>, const std::vector<bool, std::allocator<bool> >
      &>::Serialize<CHashWriter>' requested here
    a.Serialize(os);
      ^
./serialize.h:956:5: note: in instantiation of function template specialization 'Serialize<CHashWriter,
      Wrapper<VectorFormatter<DefaultFormatter>, const std::vector<bool, std::allocator<bool> > &> >'
      requested here
    Serialize(os, Using<VectorFormatter<DefaultFormatter>>(v));
    ^
./serialize.h:962:5: note: in instantiation of function template specialization
      'Serialize_impl<CHashWriter, bool, std::allocator<bool>, bool>' requested here
    Serialize_impl(os, v, T());
    ^
./hash.h:247:11: note: in instantiation of function template specialization 'Serialize<CHashWriter, bool,
      std::allocator<bool> >' requested here
        ::Serialize(*this, obj);
          ^
./hash.h:292:8: note: in instantiation of function template specialization
      'CHashWriter::operator<<<std::vector<bool, std::allocator<bool> > >' requested here
    ss << obj;
       ^
init.cpp:1504:39: note: in instantiation of function template specialization
      'SerializeHash<std::vector<bool, std::allocator<bool> > >' requested here
        const uint256 asmap_version = SerializeHash(asmap);