I am trying to write a higher order function in clojure.spec
<http://clojure.org/guides/spec> with version 1.9.0-alpha12 and have not
been able to get the validation to execute against the returned function.
Using the example in the *Higher order functions* section of the
clojure.spec guide, I define an adder form as:
(defn adder [x] #(+ x %))
As described in the guide, I create a spec as:
(s/fdef adder
:args (s/cat :x number?)
:ret (s/fspec :args (s/cat :y number?)
:ret number?)
:fn #(= (-> % :args :x) ((:ret %) 0)))
When I execute it in the repl, an exception is thrown instead of the
desired spec validation error:
user> (def add2 (adder 2))
#'user/add2
user> (add2 2)
4
user> (add2 "s")
ClassCastException java.lang.String cannot be cast to java.lang.Number
clojure.lang.Numbers.add (Numbers.java:128)
user>
I attempted to turn spec'ing on with (stest/instrument `adder). While this
works for functions, it is not working for *Higher order functions*.
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