Henning Thielemann wrote:
http://www.haskell.org/pipermail/libraries/2012-November/018709.html http://www.haskell.org/pipermail/libraries/2012-December/018716.html
Henning, In the second link above you wrote:
It would be a good opportunity to check how these packages use isLeft and isRight. E.g. if they use them in connection with fromLeft and fromRight then this would be an argument for me to exclude isLeft and isRight as well.
My main usage of isLeft/isRight is in HSpec tests where I write: value1 `shouldSatisfy' isLeft value2 `shouldSatisfy' isRight I would also be opposed to a fromLeft defined anything like fromJust: Data.Maybe.fromJust :: Maybe a -> a but would not be opposed to a fromLeft defined as John Wiegley suggested: fromLeft :: a -> Either a b -> a fromLeft _ (Left x) = x fromLeft x _ = x Erik -- ---------------------------------------------------------------------- Erik de Castro Lopo http://www.mega-nerd.com/