CLJS-1736: cljs.spec.test: checkable-syms* called with 0-arity

Author: dnolen

src/main/cljs/cljs/spec/test.cljc

@@ -181,10 +181,13 @@ Returns a collection of syms naming the vars unstrumented."
       (validate-check-opts opts#)
       (check-1 nil ~f ~spec opts#))))
 
-(defn checkable-syms* [opts]
-  (reduce into #{}
-    [(filter fn-spec-name? (keys @s/registry-ref))
-     (keys (:spec opts))]))
+(defn checkable-syms*
+  ([]
+    (checkable-syms* nil))
+  ([opts]
+   (reduce into #{}
+     [(filter fn-spec-name? (keys @s/registry-ref))
+      (keys (:spec opts))])))
 
 (defmacro checkable-syms
   "Given an opts map as per check, returns the set of syms that