This port of the CL condition system to Jolt looks interesting. Haven't been through it in detail, but the write-up on it, at a quick glance, looks thorough. https://reddit.com/r/Clojure/comments/1wr299y/cl_conditions_and_restarts_in_jolt/ (I don't know what Jolt is either, but I guess a Clojure library or DSL. since it's on their subreddit.) EDIT: I see the Foralero package, which I did not look up because the name did not immediately suggest conditions, is probably the real source. I'm not a Clojure user so just stumbled into this by chance. https://github.com/IGJoshua/farolero #CommonLisp #lisp #ConditionHandling #ErrorHandling #ErrorSystem #clojure