[GHC] #974: Add isLeft, isRight, fromLeft, fromRight, and splitEithers to Data.Either

#974: Add isLeft, isRight, fromLeft, fromRight, and splitEithers to Data.Either ---+ Reporter: guest | Owner: Type: proposal| Status: new Priority: normal

Re: [GHC] #974: Add isLeft, isRight, fromLeft, fromRight, and splitEithers to Data.Either

Hi #974: Add isLeft, isRight, fromLeft, fromRight, and splitEithers to Data.Either Woohoo! Finally! This proposal would add basic functionality to `Either` similar to that for `Maybe`. The `splitEithers` function of type `[Either a b] - ([a],[b])` is unique; however, it seems to be a