@bbrinck thanks, it worked when I did some changes in my user.clj
to import and do just what you said
if anyone else needs it:
(ns user
(:require [expound.alpha :as expound]
[clojure.spec.alpha :as s]))
(alter-var-root #'s/*explain-out* (constantly expound/printer))
@bbrinck @wilkerlucio There is a known issue with setting up expound which is fixed in ghostwheel 0.4.0-SNAPSHOT
and if it's set in the config, it now enables expound precisely in the way described above. Until then this is of course a perfectly usable workaround.