Error messages at clojure repls

repl.txt

;; clojure 1.8.0 - lein repl

user=> (defn hello "hello world")

IllegalArgumentException Parameter declaration missing  clojure.core/assert-valid-fdecl (core.clj:7181)

;; clojure 1.9.0-beta2 - lein repl

user=> (defn hello "hello world")

CompilerException clojure.lang.ExceptionInfo: Call to clojure.core/defn did not conform to spec:
val: () fails spec: :clojure.core.specs.alpha/defn-args at: [:args :bs] predicate: (alt :arity-1 :clojure.core.specs.alpha/args+body :arity-n (cat :bodies (+ (spec :clojure.core.specs.alpha/args+body)) :attr (? map?))),  Insufficient input
 #:clojure.spec.alpha{:problems [{:path [:args :bs], :reason "Insufficient input", :pred (clojure.spec.alpha/alt :arity-1 :clojure.core.specs.alpha/args+body :arity-n (clojure.spec.alpha/cat :bodies (clojure.spec.alpha/+ (clojure.spec.alpha/spec :clojure.core.specs.alpha/args+body)) :attr (clojure.spec.alpha/? clojure.core/map?))), :val (), :via [:clojure.core.specs.alpha/defn-args], :in []}], :spec #object[clojure.spec.alpha$regex_spec_impl$reify__1188 0x58b7f643 "clojure.spec.alpha$regex_spec_impl$reify__1188@58b7f643"], :value (hello "hello world"), :args (hello "hello world")}, compiling:(/private/var/folders/yp/4t8hgrbs48s7_knny7sxjsxm0000gn/T/form-init9033224319960604811.clj:1:1)
 
;; with expound

user=> (require '[expound.alpha :as expound])
nil
user=> (require '[clojure.spec.alpha :as s])
nil
user=> (set! s/*explain-out* expound/printer)
#function[expound.alpha/printer]
user=> (defn hello "hello world")

CompilerException clojure.lang.ExceptionInfo: Call to clojure.core/defn did not conform to spec:
-- Syntax error -------------------

  (hello "hello world")

should have additional elements. The next element is named `:args` and satisfies

  (clojure.spec.alpha/alt
   :arity-1
   :clojure.core.specs.alpha/args+body
   :arity-n
   (clojure.spec.alpha/cat
    :bodies
    (clojure.spec.alpha/+
     (clojure.spec.alpha/spec :clojure.core.specs.alpha/args+body))
    :attr
    (clojure.spec.alpha/? map?)))