[Bug c++/57986] call to local "bind" template function called std::bind without "using" any namespace.

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57986

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
    class vector_iterator_asdf :
        public std::iterator<std::random_access_iterator_tag, T *,
                     std::ptrdiff_t, T *const *, T *const &> {

vector_iterator_asdf has a base class defined in namespace std, therefore that
is an associated namespace and so an unqualified call to bind() with an
argument of type vector_iterator_asdf can find std::bind via ADL.