code: private BeanSpec beanSpecOf(Field field, Type genericType) {
          return of(field, genericType, injector);
  //        int len = typeArgs.size();
  //        for (int i = 0; i < len; ++i) {
  //            if (genericType.equals(typeArgs.get(i))) {
  //                return of(field, typeImpls.get(i), injector());
  //            }
  //        }
  //        return of(field, injector);
      }
docs: find the beanspec of a field with generic type