At least on my machine the following code
(lreq/with-lazy-require [[clojure.core.async :as async]]
(async/go 1))
produces the following error:
Wrong number of args (1) passed to: clojure.core.async/go
which can be worked around with:
(lreq/with-lazy-require [[clojure.core.async :as async]]
(async/go nil nil 1))
as macros actually take two more implicit arguments: &env and &form.