Hi!

The following test throws an exception when run using "lein test" and I 
can't figure out why.

(ns issue
  (:require  [clojure.test :as t]
             [clojure.spec.alpha :as s]
             [clojure.spec.test.alpha :as st]))

(s/fdef ::boolean-supplier
  :args (s/cat)
  :ret boolean?)

(defn make-fn [boolean-supplier]
  (fn []
    (boolean-supplier)))

(s/fdef make-fn
  :args (s/cat :supplier ::boolean-supplier))

(t/deftest issue
  (t/testing "issue demo"
    (st/instrument)
    (make-fn (fn [] true))))

Here's the output of "lein test":

$ lein test                       
                                                         
lein test issue                                                
                                                                  
lein test :only issue/issue                                                
      
                                                           
ERROR in (issue) (Compiler.java:7647)                          
Uncaught exception, not in assertion.                                      
            
expected: nil                                                              
   
  actual: clojure.lang.Compiler$CompilerException: Syntax error compiling 
at (clojure/test/check/clojure_test.cljc:95:1).
#:clojure.error{:phase :compile-syntax-check, :line 95, :column 1, :source 
"clojure/test/check/clojure_test.cljc"}
 at clojure.lang.Compiler.load (Compiler.java:7647)                        
  
    clojure.lang.RT.loadResourceScript (RT.java:381)                 
    clojure.lang.RT.loadResourceScript (RT.java:372)                        
                    
    clojure.lang.RT.load (RT.java:463)                          
    clojure.lang.RT.load (RT.java:428)
    ...
Caused by: java.lang.ClassCastException: clojure.lang.AFunction$1 cannot be 
cast to clojure.lang.MultiFn
 at clojure.core$get_method.invokeStatic (core.clj:1817)
    clojure.core$get_method.invoke (core.clj:1817)                          
           
    clojure.test.check.clojure_test$eval1131.invokeStatic 
(clojure_test.cljc:95)
    clojure.test.check.clojure_test$eval1131.invoke (clojure_test.cljc:95)
    clojure.lang.Compiler.eval (Compiler.java:7176)                        
  
    clojure.lang.Compiler.load (Compiler.java:7635)
    ...

Using Java 10.0.2 and the following dependencies:

$ lein deps :tree
 [clojure-complete "0.2.5" :exclusions [[org.clojure/clojure]]]
 [nrepl "0.5.3" :exclusions [[org.clojure/clojure]]]
   [nrepl/bencode "1.0.0"]
 [org.clojure/clojure "1.10.0"]
 [org.clojure/core.specs.alpha "0.2.44"]
 [org.clojure/spec.alpha "0.2.176"]
 [org.clojure/test.check "0.9.0"]

Any ideas?

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