Strange template template parameter expected error [duplicate]

This question already has an answer here:

• clang++ - treat template class name as template in the class scope 2 answers

When trying to compile this piece of code :

template <class URNG>
struct Dumb : Brain<Dumb, URNG>
{
    Move operator()(const Rat<Dumb, URNG>& rat, URNG&& urng)
    {
        Move move;
        move.x = 1;
        move.y = 0;
        //rat.look(1, 2);
        //rat.getDna(35);
        return move;
    }
};

clang 3.2.7 raise, this strange error I don't understand :

main.cpp:10:28: error: template argument for template template parameter must be a class template or type alias template
        Move operator()(const Rat<Dumb, URNG>& rat, URNG&& urng)
                                  ^

Dumb is a class template isn't it ?

As asked in the comments, here is what rat looks like :

template <template <class> class BRAIN, class URNG>
class Rat
{
//...
}