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diff --git a/src/Haddock/Interface/LexParseRn.hs b/src/Haddock/Interface/LexParseRn.hs
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+
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Haddock.Interface.LexParseRn
+-- Copyright   :  (c) Isaac Dupree 2009,
+-- License     :  BSD-like
+--
+-- Maintainer  :  haddock@projects.haskell.org
+-- Stability   :  experimental
+-- Portability :  portable
+-----------------------------------------------------------------------------
+
+module Haddock.Interface.LexParseRn (
+  HaddockCommentType(..),
+  lexParseRnHaddockComment,
+  lexParseRnHaddockCommentList,
+  lexParseRnMbHaddockComment,
+  lexParseRnHaddockModHeader
+  ) where
+
+import Haddock.Types
+
+import Data.Maybe
+
+#if __GLASGOW_HASKELL__ >= 611
+import Haddock.Interface.Lex
+import Haddock.Interface.Parse
+import Haddock.Interface.Rn
+import Haddock.Interface.ParseModuleHeader
+import Haddock.HsDoc
+import FastString
+#endif
+
+import GHC
+import RdrName
+
+data HaddockCommentType = NormalHaddockComment | DocSectionComment
+
+lexParseRnHaddockCommentList :: HaddockCommentType -> GlobalRdrEnv -> [HsDocString] -> ErrMsgM (Maybe (HsDoc Name))
+lexParseRnHaddockCommentList hty gre docStrs = do
+  docMbs <- mapM (lexParseRnHaddockComment hty gre) docStrs
+  let docs = catMaybes docMbs
+  let doc = foldl docAppend DocEmpty docs
+  case doc of
+    DocEmpty -> return Nothing
+    _ -> return (Just doc)
+
+lexParseRnHaddockComment :: HaddockCommentType ->
+    GlobalRdrEnv -> HsDocString -> ErrMsgM (Maybe (HsDoc Name))
+#if __GLASGOW_HASKELL__ >= 611
+lexParseRnHaddockComment hty gre (HsDocString fs) = do
+   let str = unpackFS fs
+   let toks = tokenise str
+   let parse = case hty of
+         NormalHaddockComment -> parseHaddockParagraphs
+         DocSectionComment -> parseHaddockString
+   case parse toks of
+     Nothing -> do
+       tell ["doc comment parse failed: "++str]
+       return Nothing
+     Just doc -> do
+       return (Just (rnHsDoc gre doc))
+#else
+lexParseRnHaddockComment _ _ doc = return (Just doc)
+#endif
+
+lexParseRnMbHaddockComment :: HaddockCommentType -> GlobalRdrEnv -> Maybe HsDocString -> ErrMsgM (Maybe (HsDoc Name))
+lexParseRnMbHaddockComment _ _ Nothing = return Nothing
+lexParseRnMbHaddockComment hty gre (Just d) = lexParseRnHaddockComment hty gre d
+
+-- yes, you always get a HaddockModInfo though it might be empty
+lexParseRnHaddockModHeader :: GlobalRdrEnv -> GhcDocHdr -> ErrMsgM (HaddockModInfo Name, Maybe (HsDoc Name))
+#if __GLASGOW_HASKELL__ >= 611
+lexParseRnHaddockModHeader gre mbStr = do
+  let failure = (emptyHaddockModInfo, Nothing)
+  case mbStr of
+    Nothing -> return failure
+    Just (L _ (HsDocString fs)) -> do
+      let str = unpackFS fs
+      case parseModuleHeader str of
+        Left mess -> do
+          tell ["haddock module header parse failed: " ++ mess]
+          return failure
+        Right (info, doc) ->
+          return (rnHaddockModInfo gre info, Just (rnHsDoc gre doc))
+#else
+lexParseRnHaddockModHeader _ hdr = return hdr
+#endif
+