Andrew Wagner schrieb: > The problem here is even slightly deeper than you might realize. For > example, what if you have a list of functions. How do you compare two > functions to each other to see if they're equal? There is no good way > really to do it! So, not only is == not completely polymorphic, but it > CAN'T be. > > There is a nice solution for this, however, and it's very simple: > > contain :: Eq a -> [a] -> Bool > contain x [] = False > contain x (y:ys) = if x == y then True else contain x ys
Would HLint jump in here and suggest: contain x (y:ys) = x == y || contain x ys ? Or even "replace 'contain' by 'elem'" ? _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
