Compiles without warnings even though there is a potential name conflict.

import_names.clj

(ns import-names.core
  (:import (java.util Date)))

(def Date "Should this compile?")

(defn -main []
  (println Date))

;; Throws:

;; Exception in thread "main" java.lang.RuntimeException:
;; Expecting var, but Date is mapped to class java.util.Date

import_names.cljs

(ns import-names.core
  (:import [goog debug]))

;; This var has the same name as an imported JS object 
(def debug goog.debug)