Clojure 1.9.0

;; Error during read
user=> :::5
RuntimeException Invalid token: :::5  clojure.lang.Util.runtimeException (Util.java:221)

;; Macroexpand spec error
user=> (let [x])
CompilerException clojure.lang.ExceptionInfo: Call to clojure.core/let did not conform to spec:
In: [0] val: () fails spec: :clojure.core.specs.alpha/bindings at: [:args :bindings :init-expr] predicate: any?,  Insufficient input
 #:clojure.spec.alpha{:problems [{:path [:args :bindings :init-expr], :reason "Insufficient input", :pred clojure.core/any?, :val (), :via [:clojure.core.specs.alpha/bindings :clojure.core.specs.alpha/bindings], :in [0]}], :spec #object[clojure.spec.alpha$regex_spec_impl$reify__2436 0x2072acb2 "clojure.spec.alpha$regex_spec_impl$reify__2436@2072acb2"], :value ([x]), :args ([x])}, compiling:(NO_SOURCE_PATH:2:1)
 
;; Macroexpand intentional check error
user=> (cond 1)
IllegalArgumentException cond requires an even number of forms  clojure.core/cond (core.clj:600)

;; Macroexpand unexpected error
user=> (defmulti 5 class)
ClassCastException java.lang.Long cannot be cast to clojure.lang.IObj  clojure.core/with-meta--5142 (core.clj:217)

;; Compile error
user=> (def 5)
CompilerException java.lang.RuntimeException: First argument to def must be a Symbol, compiling:(NO_SOURCE_PATH:5:1)

;; Evaluation error
user=> (/ 1 0)
ArithmeticException Divide by zero  clojure.lang.Numbers.divide (Numbers.java:163)

;; Spec function invocation error
user=> (require '[clojure.spec.alpha :as s] '[clojure.spec.test.alpha :as stest])
nil
user=> (defn f [a] a)
#'user/f
user=> (s/fdef f :args (s/cat :a int?))
user/f
user=> (stest/instrument `f)
[user/f]
user=> (f "oops")
ExceptionInfo Call to #'user/f did not conform to spec:
In: [0] val: "oops" fails at: [:args :a] predicate: int?
  clojure.core/ex-info (core.clj:4739)
	
;; Assertion failure
user=> (assert false)
AssertionError Assert failed: false  user/eval154 (NO_SOURCE_FILE:12)

;; Print error in repl
user=> (deftype T [a])
user.T
user=> (defmethod print-method T [_ w] (throw (Exception. "boom")))
#object[clojure.lang.MultiFn 0x14dda234 "clojure.lang.MultiFn@14dda234"]
user=> (->T 1)
Exception boom  user/eval161/fn--162 (NO_SOURCE_FILE:14)