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[Resolvido] Elementos repetidos numa lista


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data Auction = Auction {
actid :: Int,
actowner :: String,
actdesc :: String,
actvalue :: Int,
actbidder :: String
} deriving (Show,Eq,Ord) 

Tenho este data Type , e quero fazer uma função que percorra uma lista de Auction, para ver se existem actid repetidos. Caso exista é devolvido True

repetidos :: [Auction] -> Bool

eu tinha feito uma coisa deste género, mas isto só funciona para o primeiro da lista....

auctioncompare :: [Auction] -> Bool
auctioncompare [] = False
auctioncompare ((Auction a b c d e):(Auction q w i r t):hs) = if (a==q) then True else auctioncompare((Auction a b c d e):hs)

Algém tem ideia de como acabar isto?

Obrigado desde já

Edit: Já está resolvido!

Edited by Baderous
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