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diff --git a/haddock-library/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Internal.hs b/haddock-library/vendor/attoparsec-0.10.4.0/Data/Attoparsec/Internal.hs
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+-- |
+-- Module      :  Data.Attoparsec.Internal
+-- Copyright   :  Bryan O'Sullivan 2012
+-- License     :  BSD3
+--
+-- Maintainer  :  bos@serpentine.com
+-- Stability   :  experimental
+-- Portability :  unknown
+--
+-- Simple, efficient parser combinators, loosely based on the Parsec
+-- library.
+
+module Data.Attoparsec.Internal
+    (
+      compareResults
+    ) where
+
+import Data.Attoparsec.Internal.Types (IResult(..))
+
+-- | Compare two 'IResult' values for equality.
+--
+-- If both 'IResult's are 'Partial', the result will be 'Nothing', as
+-- they are incomplete and hence their equality cannot be known.
+-- (This is why there is no 'Eq' instance for 'IResult'.)
+compareResults :: (Eq t, Eq r) => IResult t r -> IResult t r -> Maybe Bool
+compareResults (Fail i0 ctxs0 msg0) (Fail i1 ctxs1 msg1) =
+    Just (i0 == i1 && ctxs0 == ctxs1 && msg0 == msg1)
+compareResults (Done i0 r0) (Done i1 r1) =
+    Just (i0 == i1 && r0 == r1)
+compareResults (Partial _) (Partial _) = Nothing
+compareResults _ _ = Just False