Re: [Haskell-cafe] Call for comments: neither package

Hi Michael Good names are a problem of course. The "Applicative Programming with Effects Paper" has the "monodial accumulating" applicative instance on a sum type Conor McBride and Ross Paterson call Except: data Except err a = OK a | Failed err The names are nice and to the point, but they would equally describes the other exception model (monadic - exit on first fail) and having both might be particularly confusing to newcomers: two error types - one with an obvious name, one with an unfamiliar one, the unfamiliar one might be the one they need most often... Sum might be a candidate, were it not already taken as a type name by Data.Monoid: data Sum e a = ??? e | Result a