cat doesn't output in low level in cider

[alishsan]

I tried the low level usage with cat, but it doesn't work like in the example. What could be the problem?

`playsync.core> (def p (sh/proc "cat"))

#'playsync.core/p

playsync.core> (future (sh/stream-to-out p :out))

#object[clojure.core$future_call$reify__8097 0x141df919 {:status :pending, :val nil}]

playsync.core> (sh/feed-from-string p "foo\n")

nil`