deftype

(deftype Name [fields...] Protocol (method [target & args] body...) ...)

Defines a deftype: a record-shaped value opaque to the map verbs. The value shares the record's shape, class name included, with a :C%TYPE tag; reads miss (get answers the default), writers and seq/count/empty? signal, and = is identity, like the oracle. Only the positional constructor ->Name lowers (the oracle defines no map->Name for deftypes); (Name. ...) rewrites to it. Inline method bodies see the fields as locals, like defrecord. A field marked ^:unsynchronized-mutable or ^:volatile-mutable is private to those methods, which assign it with set!. An instance call reaches the inline methods and the immutable fields (.name). The name joins the whole-file pre-scan.