move examples and seq properties to the top.

so that i can add undistracted to the end.

hs/DataStructures.hs

import Prelude hiding (concat, drop, last, length, reverse, take)
-- examples
sl = fromList [1..10] :: List Integer
bq = fromList [1..10] :: BankersQueue Integer
ft = fromList [1..10] :: FingerTree Integer
-- properties
-- rest nil == nil
-- (reverse . reverse) s == s
-- first [s] == last [s]
class Seq s where
    first :: s a -> Maybe a
    dequeue ft =
        case last ft of
            Just x -> Just (x, rest ft) -- broken, we'd need a different version of rest
sl = fromList [1..10] :: List Integer
bq = fromList [1..10] :: BankersQueue Integer
ft = fromList [1..10] :: FingerTree Integer