qsort1 qsort1 Ord qsort1 qsort1 xs qsort1 lesser qsort1 greater where

<<qsort1>>=
qsort1 :: Ord a => [a] -> [a]
qsort1 []     = []
qsort1 (p:xs) = qsort1 lesser ++ [p] ++ qsort1 greater
    where
        lesser  = [ y | y <- xs, y < p ]
        greater = [ y | y <- xs, y >= p ]