Export `asum` also from `Control.Applicative`.
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msumis exported fromControl.Monad - Looking for
asuminData.Foldableis fine, but usually if you wantasumyou importControl.ApplicativeforAlternativealready.
Edited by Oleg Grenrus
msum is exported from Control.Monad
asum in Data.Foldable is fine, but usually if you want asum you import Control.Applicative for Alternative already.