void *btr_context(struct btr_node *btrn);
void btr_merge(struct btr_node *btrn, size_t dest_size);
void btr_log_tree(struct btr_node *btrn, int loglevel);
-int btr_pushdown_one(struct btr_node *btrn);
+void btr_pushdown_one(struct btr_node *btrn);
bool btr_inplace_ok(struct btr_node *btrn);
int btr_node_status(struct btr_node *btrn, size_t min_iqs,
enum btr_node_type type);