typedef struct Tree<Type, Impl>{
    /* future Code */
    /* Type* tree; */
    /* Type* node; */
    union Data* tree;
    struct Node* node;
    __code put(Impl* tree,Type* node, __code next(...));
    // __code get(Impl* tree, __code next(...));
    // __code removeRedBlackTree();
    // __code clearRedBlackTree();
    __code next(...);
} Tree;