Afraid of leaks with async chan

[JokkeB]

I'm a bit unsure of which channels will be collected and which will remain and potentially result in an out of memory error. I'd like to understand when I should close, unsub and untap channels to avoid leaks. It feels like a very difficult task to verify there are no leaks.

For example:

(defn read-one-msg [source]
 (let [c (async/chan)]
  (async/sub source :msg c)
  (async/<!! c)))

Will this leak c, should I manually unsub it?

I constantly stumble on this kind of questions so I'd like to understand better how to deal with these situations.