[Haskell-cafe] List as input

module Main where import Data.List -- quicksort of any list qsort [] = [] qsort (x:xs) = qsort(filter(=x) xs) -- optimized quicksort, uses middle element as pivot qsortOpt [] = [] qsortOpt x = qsortOpt less ++ [pivot] ++ qsortOpt greater where pivot = x !! ((length x) `div` 2) less = filter (=pivot) (delete pivot x) main = do putStr "Enter a list: " l <- readLn print (qsortOpt l) -- end of code Why do I get ERROR "qsort.hs":17 - Unresolved top-level overloading *** Binding : main *** Outstanding context : (Read b, Show b, Ord b) ? -- View this message in context: http://www.nabble.com/List-as-input-tp19987726p19987726.html Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.