Reflection with Executor?

executor-reflection.clj

(import '[java.util.concurrent Executors Executor])

(set! *warn-on-reflection* true)

(def ^Executor tp (Executors/newFixedThreadPool 4))

;; Reflection warning, NO_SOURCE_PATH:1:1 - call to submit can't be resolved.                                                  
(.submit ^Executor tp ^Callable (constantly 42))

Note that in this particular case this leads not just to reflection but to incorrectness at runtime, as a Fn satisfies both the Runnable and the Callable case and so the wrong method can easily be called.