What does (..) mean?

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I'm trying to learn Haskell.

I'm reading the code on here[1]. I just copy and past some part of the code from lines:46 and 298-300.

Question: What does (..) mean?

I Hoggled it but I got no result.

module Pos.Core.Types(
-- something here

 SharedSeed (..) -- what does this mean?

) where


newtype SharedSeed = SharedSeed
{ getSharedSeed :: ByteString
} deriving (Show, Eq, Ord, Generic, NFData, Typeable)

[1] https://github.com/input-output-hk/cardano-sl/blob/master/core/Pos/Core/Types.hs

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