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A comment on When in doubt, turn to _why. Parent comment

Re:When in doubt, turn to _why by shrughes on Thursday January 22, 2009 @09:47PM (#445835)
What version of GHC (or of the libraries) do you have? (Either String) should be a monad as specified through Control.Monad.Error:

    instance Error e => Monad (Either e) where
        ...
I didn't consider Data.Map.fromListWith; I didn't know about it. (Thanks.)
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