Re: Proposal: Add isLeft/isRight to Data.Either

Herbert Valerio Riedel writes: [...]

and also their dual (see fromRight' above) is defined there:

sorry, I was mixed something up; ignore that "(see fromRight' above)" comment the dual to 'maybeRight' is rather something like: maybeToRight :: a -> Maybe b -> Either a b maybeToRight l = maybe (Left l) Right

- precis:Precis.Utils.ControlOperators.elaborate - errors:Control.Error.Util.note

- from{Left,Right} are useful when working in the 'Maybe' monad or

s/from/maybe/