Remove workaround that had been needed for older ghc versions.

src/Text/Pandoc/Writers/Powerpoint/Presentation.hs

@@ -176,11 +176,6 @@ runPres :: WriterEnv -> WriterState -> Pres a -> (a, [LogMessage])
 runPres env st p = (pres, reverse $ stLog finalSt)
   where (pres, finalSt) = runState (runReaderT p env) st
 
--- GHC 7.8 will still complain about concat <$> mapM unless we specify
--- Functor. We can get rid of this when we stop supporting GHC 7.8.
-concatMapM        :: (Monad m) => (a -> m [b]) -> [a] -> m [b]
-concatMapM f xs   =  liftM concat (mapM f xs)
-
 type Pixels = Integer
 
 data Presentation = Presentation DocProps [Slide]
@@ -348,7 +343,7 @@ instance Default PicProps where
 --------------------------------------------------
 
 inlinesToParElems :: [Inline] -> Pres [ParaElem]
-inlinesToParElems = concatMapM inlineToParElems
+inlinesToParElems = fmap mconcat . mapM inlineToParElems
 
 inlineToParElems :: Inline -> Pres [ParaElem]
 inlineToParElems (Str s) = do
@@ -484,7 +479,7 @@ blockToParagraphs (BlockQuote blks) =
                                                  , pPropIndent = Just 0
                                                  }
                 , envRunProps = (envRunProps r){rPropForceSize = Just blockQuoteSize}})$
-  concatMapM blockToParagraphs blks
+  mconcat <$> mapM blockToParagraphs blks
 -- TODO: work out the format
 blockToParagraphs blk@(RawBlock _ _) = do addLogMessage $ BlockNotRendered blk
                                           return []
@@ -508,7 +503,7 @@ blockToParagraphs (BulletList blksLst) = do
                                            , pPropIndent = Nothing
                                            , pPropIncremental = incremental
                                            }}) $
-    concatMapM multiParList blksLst
+    mconcat <$> mapM multiParList blksLst
 blockToParagraphs (OrderedList listAttr blksLst) = do
   pProps <- asks envParaProps
   incremental <- listShouldBeIncremental
@@ -518,7 +513,7 @@ blockToParagraphs (OrderedList listAttr blksLst) = do
                                            , pPropIndent = Nothing
                                            , pPropIncremental = incremental
                                            }}) $
-    concatMapM multiParList blksLst
+    mconcat <$> mapM multiParList blksLst
 blockToParagraphs (DefinitionList entries) = do
   incremental <- listShouldBeIncremental
   let go :: ([Inline], [[Block]]) -> Pres [Paragraph]
@@ -526,11 +521,12 @@ blockToParagraphs (DefinitionList entries) = do
         term <-blockToParagraphs $ Para [Strong ils]
         -- For now, we'll treat each definition term as a
         -- blockquote. We can extend this further later.
-        definition <- concatMapM (blockToParagraphs . BlockQuote) blksLst
+        definition <-
+          mconcat <$> mapM (blockToParagraphs . BlockQuote) blksLst
         return $ term ++ definition
   local (\env -> env {envParaProps =
                        (envParaProps env) {pPropIncremental = incremental}})
-    $ concatMapM go entries
+    $ mconcat <$> mapM go entries
 blockToParagraphs (Div (_, classes, _) blks) = let
   hasIncremental = "incremental" `elem` classes
   hasNonIncremental = "nonincremental" `elem` classes
@@ -538,7 +534,7 @@ blockToParagraphs (Div (_, classes, _) blks) = let
                    | hasNonIncremental -> Just InNonIncremental
                    | otherwise -> Nothing
   addIncremental env = env { envInIncrementalDiv = incremental }
-  in local addIncremental (concatMapM blockToParagraphs blks)
+  in local addIncremental (mconcat <$> mapM blockToParagraphs blks)
 blockToParagraphs (Figure attr capt blks) = -- This never seems to be used:
   blockToParagraphs (Shared.figureDiv attr capt blks)
 blockToParagraphs hr@HorizontalRule = notRendered hr
@@ -563,7 +559,7 @@ multiParList (b:bs) = do
                   , pPropLevel = level + 1
                   }
                 })
-        $ concatMapM blockToParagraphs bs
+        $ mconcat <$> mapM blockToParagraphs bs
   return $ p ++ ps
 
 cellToParagraphs :: Alignment -> SimpleCell -> Pres [Paragraph]
@@ -824,7 +820,7 @@ blocksToSlide' lvl blks spkNotes = bodyBlocksToSlide lvl blks spkNotes
 blockToSpeakerNotes :: Block -> Pres SpeakerNotes
 blockToSpeakerNotes (Div (_, ["notes"], _) blks) =
   local (\env -> env{envInSpeakerNotes=True}) $
-  SpeakerNotes <$> concatMapM blockToParagraphs blks
+  SpeakerNotes . mconcat <$> mapM blockToParagraphs blks
 blockToSpeakerNotes _ = return mempty
 
 handleSpeakerNotes :: Block -> Pres ()