[Haskell-cafe] Question on definition of `parse' function in Parsec library.

[Captain Freako]

Hi all,

In this definition from the Parsec library:

parse :: (Stream s Identity t)      => Parsec s () a -> SourceName ->
s -> Either ParseError aparse p = runP p ()

what's the significance of `Identity t'?
(`t' isn't used anywhere.)

Thanks,
-db
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