- make-hash-trie-type KEY=? KEY-HASHprocedure
Constructor for hash trie types. KEY=? must be a key equality predicate, a procedure of two arguments that returns true to indicate that they are equal and false to indicate that they are not, and that behaves transitively, symmetrically, and reflexively. KEY-HASH must be a key hash function that preserves the key equality predicate, i.e. for keys A and B, it must be that if (KEY=? A B), then (= (KEY-HASH A) (KEY-HASH B)).