(rapid rbtree)

(make-tree)

(tree-fold proc seed tree)

(tree-fold/reverse proc seed tree)

(tree-search less? tree obj failure success)

(tree-key-successor less? tree obj failure)

(tree-key-predecessor less? tree obj failure)

(tree-map proc tree)

(tree-catenate tree1 pivot-key pivot-value tree2)

(tree-split less? tree obj)

(assume-tree less? tree)