It's annoying that exceptions created with ex-info are boxed inside another ex-info, because we need to use guard to capture our ex-info data. Imho (very humble), since core-match is called on ex-data it is data already, a simple map. When catching the exception pedestal could check if it is a ex-info and merge its keys with its data, qualified …

boxed_exceptioninfo.clj

(def service-error-handler
  (error-int/error-dispatch [ctx ex]
    [({:exception-type :clojure.lang.ExceptionInfo}
      :guard #(= (:type (ex-data (:exception %)))  :guts.core/validation-failed))
     ](do
                              (pprint (ex-data ex))
          (assoc ctx :response {:status 400
                                :body (:errors (ex-data ex))}))
    ;; If we don't match, forward it on
    :else
                            (do
                              ;; (pprint ex)
                              ;; (pprint (ex-data ex))
                              ;; (println "cannot capture")
                              (assoc ctx :io.pedestal.interceptor.chain/error ex))))