Class has user-written copy constructor but no user-written assignment operator

Defect 105112 (STATIC_C)
Checker COPY_WITHOUT_ASSIGN (subcategory none)
File: /src/mongo/db/storage/biggie/store.h
Parse Warning (no function name available)
/src/mongo/db/storage/biggie/store.h, line: 62
Class "mongo::biggie::RadixStore<std::_cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::Head" has a user-written copy constructor "mongo::biggie::RadixStore<std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::Head::Head(mongo::biggie::RadixStore<std::cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::_cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::Head const &)" but no corresponding user-written assignment operator.

        class Head;

/src/mongo/db/storage/biggie/store.h, line: 854
User-written copy constructor.

            Head(const Head& other) : Node(other) {