lcc-clojure.actors> (def ^:dynamic foo)
#'lcc-clojure.actors/foo
lcc-clojure.actors> (with-redefs [foo "bar"] (.start (Thread. #(println foo))))
#<Unbound Unbound: #'lcc-clojure.actors/foo>
nil
lcc-clojure.actors> (binding [foo "bar"] (.start (Thread. #(println foo))))
#<Unbound Unbound: #'lcc-clojure.actors/foo>
nil
lcc-clojure.actors>