Returns the immediate and indirect children of tag, through a relationship established via derive. h must be a hierarchy obtained from make-hierarchy, if not supplied defaults to the global hierarchy. Note: does not work on Java type inheritance relationships.
; clojure/core.clj:3326 (defn descendants ([tag] (descendants global-hierarchy tag)) ([h tag] (if (class? tag) (throw (java.lang.UnsupportedOperationException. "Can't get descendants of classes")) (not-empty (get (:descendants h) tag)))))
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