> While that's true, Haskell also makes it easy to make the same sort of > error with IO (or any other Monad) values, whether created with the FFI > or not. If you say > > f = do x > y > z > > and y has type IO CInt then you won't get an error (and I don't think > you can even ask for a warning with the current implementations). > > Should we have > (>>) :: (Monad m) => m () -> m a -> m a > and force you to write > _ <- y
It's intersting to note that F# follows exactly your proposal. If x has a return type other than () then you do: y |> ignore where ignore :: a -> (), and |> = flip ($) In practice, I found this quite reasonable to use. You also eliminate "errors" such as: do mapM deleteFile files ; return 1 Where mapM requires more memory than the equivalent mapM_ Thanks Neil _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
