There seems to be an issue with the rebinding of loop-bindings using 
loop/recur in go blocks,
specifically when you are just changing the order of the original bindings 
in a recur call.

Take this snippet for example:

   
(require '[clojure.core.async :refer [go timeout]])
> (go (loop [a :black, b :white]  
>       (println a b)
>       (<! (timeout 1000))
>       (recur b a)))
>

Instead of repeatedly printing

:black :white
> :white :black
> :black :white 
> :white :black
> (...)
>

 it actually prints

:black :white
> :white :white
> :white :white
> :white :white
> (...)
>
 
Note however, that 
 

> (require '[clojure.core.async :refer [go timeout]])
> (go (loop [a :black, b :white]  
>       (println a b)
>       (<! (timeout 1000))
>       (recur (identity b) (identity a))))
>

works correctly.

Any ideas as to what's causing this?


Cheers,
Kevin

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