As noted in the alpha change list, this was an intentional change in what 
instrument does. Instrument is intended to be used to verify that other 
callers have invoked a function correctly. Checking that the function works 
(by verifying that :ret and :fn return valid results) should be done using 
one of the spec.test functions during testing.

Some other spec features are still to be added as well that relate to this 
change.

On Tuesday, June 14, 2016 at 7:01:09 PM UTC-5, Alan Thompson wrote:
>
> Hi - Just noticed that the :ret function in fdef seems to be ignored in 
> 1.9.0-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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