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A comment on Reducers, transducers and core.async in Clojure. Parent comment

Re:Reducers, transducers and core.async in Clojure by mod on Wednesday June 07, 2017 @11:23AM (#14507163)
I think the inner set is supposed to be brackets [].

It's a comprehension.

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Re:Reducers, transducers and core.async in Clojure by whalesalad on Wednesday June 07, 2017 @11:25AM (#14507184)
The above commenter is correct. You can use parens in place of brackets to utilize a generator.
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