Maybe, the following is the same reason.
```
(defn ranged-rand ;; BROKEN!
"Returns random integer in range start <= rand < end"
[start end]
(+ start (rand-int (- start end))))
(s/fdef ranged-rand
:args (s/and (s/cat :start integer? :end integer?)
#(< (:start %) (:end %)))
:ret integer?
:fn (s/and #(>= (:ret %) (-> % :args :start))
#(< (:ret %) (-> % :args :end))))
(ranged-rand 8 10)
;;=> ExceptionInfo Call to #'spec-example.core/ranged-rand did not conform
to spec:
;;=> At: [:fn] val: {:args {:start 8, :end 10}, :ret 7} fails predicate:
(>= (:ret %) (-> % :args :start))
;;=> :clojure.spec/args (8 10)
;;=> clojure.core/ex-info (core.clj:4617)
(println *clojure-version*)
;;=> {:major 1, :minor 9, :incremental 0, :qualifier alpha1}
(s/instrument #'ranged-rand)
(ranged-rand 8 10)
;;=> 7
(println *clojure-version*)
;;=> {:major 1, :minor 9, :incremental 0, :qualifier alpha6}
```
> user=> (require '[clojure.spec :as s])
> user=> (defn dummy [x] (if x "yes" "no"))
> user=> (s/fdef dummy
> #_=> :args (s/cat :x integer?)
> #_=> :ret integer?)
> user=> (s/instrument #'dummy)
> user=> (dummy 3) (println *clojure-version*)
> ExceptionInfo Call to #'user/dummy did not conform to spec:
> val: "yes" fails at: [:ret] predicate: integer?
> :clojure.spec/args (3)
> clojure.core/ex-info (core.clj:4703)
> {:major 1, :minor 9, :incremental 0, :qualifier alpha5}
>
> ;-------------------------------------------------------------------
>
> user=> (dummy 3) (println *clojure-version*)
> "yes"
> {:major 1, :minor 9, :incremental 0, :qualifier alpha6}
>
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