Hi,

I sometimes (in fact quite often) want to use the -> macro like this:

(-> {}
  (assoc :a "a")
  (assoc :b (some-fn CTX)))


where CTX should be the current value of the threaded element. Currently, 
I'm forced to write a helper function

(defn add-some-fn [ctx]
  (assoc ctx :b (some-fn ctx)))

and rewrite my usage of -> to

(-> {}
  (assoc :a "a")
  (add-some-fn))

This works, of course, but somehow feels awkward (it destroys the 
uniformity of my assoc chaining). Is there a more idiomatic way to do this?

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