> Philippa Cowderoy wrote: > > > The ability to fail doesn't need the do notation, just use of > > return for success - similar for propagating failure. > > I'm not sure I understand. Do you mean writing functions > like: > > sqr x | x < 0 = fail "less than zero" > | otherwise = return (sqrt x)
s/fail/error/ s/return// Then you can easily write > I can't (easily) write > > text c = sqr x + sqr (x+1) You just can't *catch* this outside the IO monad. --KW 8-) -- Keith Wansbrough <[EMAIL PROTECTED]> http://www.cl.cam.ac.uk/users/kw217/ University of Cambridge Computer Laboratory. _______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
