return true;
            }
            if (o == null || getClass() != o.getClass()) {
                return false;
            }
            Cons<?> cons = (Cons<?>) o;
            return head.equals(cons.head) && tail.equals(cons.tail);
        }

        @Override
        public int hashCode() {
            return Objects.hash(head, tail);
        }

        @Override

                    attributes {
                        attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category, "foo"))
                    }
                }
                consumable("cons") {
                    attributes {
                        attribute(Category.CATEGORY_ATTRIBUTE, objects.named(Category, "foo"))
                    }
                }
            }