types - What does `:-` mean in clojure's core.typed? -

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what :- mean in this code core.typed library?

(t/ann play-many [(ta/chan rpsresult) t/int -> (t/map t/any t/any)]) (defn play-many   "play n matches out-chan , report summary of results."   [out-chan n]   (t/loop [remaining :- t/int, n                          ;; <======== line            results :- (t/map playername t/int), {}]     (if (zero? remaining)       results       (let [[m1 m2 winner] (a/<!! out-chan)]         (assert m1)         (assert m2)         (assert winner)         (recur (dec remaining)                (merge-with + results {winner 1}))))))

as mentioned, :- keyword. however, in context it's part of core.typed's annotations, marking loop bindings being of specific type:

(t/loop [remaining :- t/int, n          results :- (t/map playername t/int), {}]   ...)

this means remaining integer, while results map associating player name integer. these can verified using core.typed's type checker.


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