36 files changed, 74 insertions, 2 deletions
diff --git a/src/Text/Pandoc/Writers/AsciiDoc.hs b/src/Text/Pandoc/Writers/AsciiDoc.hs
index f91fa8fa0..036185282 100644
--- a/src/Text/Pandoc/Writers/AsciiDoc.hs
+++ b/src/Text/Pandoc/Writers/AsciiDoc.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-
 Copyright (C) 2006-2018 John MacFarlane <jgm@berkeley.edu>
@@ -37,6 +38,7 @@ that it has omitted the construct.
 AsciiDoc:  <http://www.methods.co.nz/asciidoc/>
 -}
 module Text.Pandoc.Writers.AsciiDoc (writeAsciiDoc) where
+import Prelude
 import Control.Monad.State.Strict
 import Data.Aeson (Result (..), Value (String), fromJSON, toJSON)
 import Data.Char (isPunctuation, isSpace)
diff --git a/src/Text/Pandoc/Writers/CommonMark.hs b/src/Text/Pandoc/Writers/CommonMark.hs
index 4abb77280..50224a715 100644
--- a/src/Text/Pandoc/Writers/CommonMark.hs
+++ b/src/Text/Pandoc/Writers/CommonMark.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-
 Copyright (C) 2015-2018 John MacFarlane <jgm@berkeley.edu>
@@ -32,6 +33,7 @@ CommonMark:  <http://commonmark.org>
 -}
 module Text.Pandoc.Writers.CommonMark (writeCommonMark) where
 
+import Prelude
 import CMarkGFM
 import Control.Monad.State.Strict (State, get, modify, runState)
 import Data.Foldable (foldrM)
diff --git a/src/Text/Pandoc/Writers/ConTeXt.hs b/src/Text/Pandoc/Writers/ConTeXt.hs
index f94c12d89..10e996bdb 100644
--- a/src/Text/Pandoc/Writers/ConTeXt.hs
+++ b/src/Text/Pandoc/Writers/ConTeXt.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-
@@ -30,6 +31,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Conversion of 'Pandoc' format into ConTeXt.
 -}
 module Text.Pandoc.Writers.ConTeXt ( writeConTeXt ) where
+import Prelude
 import Control.Monad.State.Strict
 import Data.Char (ord, isDigit)
 import Data.List (intercalate, intersperse)
diff --git a/src/Text/Pandoc/Writers/Custom.hs b/src/Text/Pandoc/Writers/Custom.hs
index 3daa8d0cf..53b321c7c 100644
--- a/src/Text/Pandoc/Writers/Custom.hs
+++ b/src/Text/Pandoc/Writers/Custom.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE DeriveDataTypeable   #-}
 {-# LANGUAGE FlexibleInstances    #-}
 {- Copyright (C) 2012-2018 John MacFarlane <jgm@berkeley.edu>
@@ -30,6 +31,7 @@ Conversion of 'Pandoc' documents to custom markup using
 a lua writer.
 -}
 module Text.Pandoc.Writers.Custom ( writeCustom ) where
+import Prelude
 import Control.Arrow ((***))
 import Control.Exception
 import Control.Monad (when)
diff --git a/src/Text/Pandoc/Writers/Docbook.hs b/src/Text/Pandoc/Writers/Docbook.hs
index 3034fade5..f6e814095 100644
--- a/src/Text/Pandoc/Writers/Docbook.hs
+++ b/src/Text/Pandoc/Writers/Docbook.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternGuards     #-}
 {-
@@ -30,6 +31,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Conversion of 'Pandoc' documents to Docbook XML.
 -}
 module Text.Pandoc.Writers.Docbook ( writeDocbook4, writeDocbook5 ) where
+import Prelude
 import Control.Monad.Reader
 import Data.Char (toLower)
 import Data.Generics (everywhere, mkT)
diff --git a/src/Text/Pandoc/Writers/Docx.hs b/src/Text/Pandoc/Writers/Docx.hs
index 6422f61bf..82af18f7c 100644
--- a/src/Text/Pandoc/Writers/Docx.hs
+++ b/src/Text/Pandoc/Writers/Docx.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE PatternGuards       #-}
 {-# LANGUAGE RankNTypes          #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -32,6 +33,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Conversion of 'Pandoc' documents to docx.
 -}
 module Text.Pandoc.Writers.Docx ( writeDocx ) where
+import Prelude
 import Codec.Archive.Zip
 import Control.Applicative ((<|>))
 import Control.Monad.Except (catchError)
diff --git a/src/Text/Pandoc/Writers/DokuWiki.hs b/src/Text/Pandoc/Writers/DokuWiki.hs
index a74c23764..189bf138e 100644
--- a/src/Text/Pandoc/Writers/DokuWiki.hs
+++ b/src/Text/Pandoc/Writers/DokuWiki.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-
 Copyright (C) 2008-2018 John MacFarlane <jgm@berkeley.edu>
 
@@ -39,6 +40,7 @@ DokuWiki:  <https://www.dokuwiki.org/dokuwiki>
 -}
 
 module Text.Pandoc.Writers.DokuWiki ( writeDokuWiki ) where
+import Prelude
 import Control.Monad (zipWithM)
 import Control.Monad.Reader (ReaderT, ask, local, runReaderT)
 import Control.Monad.State.Strict (StateT, evalStateT)
diff --git a/src/Text/Pandoc/Writers/EPUB.hs b/src/Text/Pandoc/Writers/EPUB.hs
index cf50e9bb9..1dab2e627 100644
--- a/src/Text/Pandoc/Writers/EPUB.hs
+++ b/src/Text/Pandoc/Writers/EPUB.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE CPP                 #-}
 {-# LANGUAGE FlexibleContexts    #-}
 {-# LANGUAGE PatternGuards       #-}
@@ -32,6 +33,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Conversion of 'Pandoc' documents to EPUB.
 -}
 module Text.Pandoc.Writers.EPUB ( writeEPUB2, writeEPUB3 ) where
+import Prelude
 import Codec.Archive.Zip (Entry, addEntryToArchive, eRelativePath, emptyArchive,
                           fromArchive, fromEntry, toEntry)
 import Control.Monad (mplus, unless, when, zipWithM)
diff --git a/src/Text/Pandoc/Writers/FB2.hs b/src/Text/Pandoc/Writers/FB2.hs
index e322c7d98..3f90f47b1 100644
--- a/src/Text/Pandoc/Writers/FB2.hs
+++ b/src/Text/Pandoc/Writers/FB2.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE PatternGuards #-}
 
 {-
@@ -37,6 +38,7 @@ FictionBook is an XML-based e-book format. For more information see:
 -}
 module Text.Pandoc.Writers.FB2 (writeFB2)  where
 
+import Prelude
 import Control.Monad (zipWithM)
 import Control.Monad.Except (catchError)
 import Control.Monad.State.Strict (StateT, evalStateT, get, lift, liftM, modify)
diff --git a/src/Text/Pandoc/Writers/HTML.hs b/src/Text/Pandoc/Writers/HTML.hs
index 6e04abd52..80210c975 100644
--- a/src/Text/Pandoc/Writers/HTML.hs
+++ b/src/Text/Pandoc/Writers/HTML.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE CPP                 #-}
 {-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -45,6 +46,7 @@ module Text.Pandoc.Writers.HTML (
   writeRevealJs,
   tagWithAttributes
   ) where
+import Prelude
 import Control.Monad.State.Strict
 import Data.Char (ord, toLower)
 import Data.List (intercalate, intersperse, isPrefixOf, partition)
diff --git a/src/Text/Pandoc/Writers/Haddock.hs b/src/Text/Pandoc/Writers/Haddock.hs
index dfa1d8b57..75b8c78dc 100644
--- a/src/Text/Pandoc/Writers/Haddock.hs
+++ b/src/Text/Pandoc/Writers/Haddock.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 
@@ -33,6 +34,7 @@ Conversion of 'Pandoc' documents to haddock markup.
 Haddock:  <http://www.haskell.org/haddock/doc/html/>
 -}
 module Text.Pandoc.Writers.Haddock (writeHaddock) where
+import Prelude
 import Control.Monad.State.Strict
 import Data.Default
 import Data.Text (Text)
diff --git a/src/Text/Pandoc/Writers/ICML.hs b/src/Text/Pandoc/Writers/ICML.hs
index a5d851e40..a81ff96e3 100644
--- a/src/Text/Pandoc/Writers/ICML.hs
+++ b/src/Text/Pandoc/Writers/ICML.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE FlexibleContexts    #-}
 {-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -16,6 +17,7 @@ InCopy is the companion word-processor to Adobe InDesign and ICML documents can
 into InDesign with File -> Place.
 -}
 module Text.Pandoc.Writers.ICML (writeICML) where
+import Prelude
 import Control.Monad.Except (catchError)
 import Control.Monad.State.Strict
 import Data.List (intersperse, isInfixOf, isPrefixOf, stripPrefix)
diff --git a/src/Text/Pandoc/Writers/JATS.hs b/src/Text/Pandoc/Writers/JATS.hs
index 3b33e5a19..fb3236bd9 100644
--- a/src/Text/Pandoc/Writers/JATS.hs
+++ b/src/Text/Pandoc/Writers/JATS.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 
 {-
@@ -31,6 +32,7 @@ Reference:
 https://jats.nlm.nih.gov/publishing/tag-library
 -}
 module Text.Pandoc.Writers.JATS ( writeJATS ) where
+import Prelude
 import Control.Monad.Reader
 import Data.Char (toLower)
 import Data.Generics (everywhere, mkT)
diff --git a/src/Text/Pandoc/Writers/LaTeX.hs b/src/Text/Pandoc/Writers/LaTeX.hs
index 58a4c4d86..f354bc0a2 100644
--- a/src/Text/Pandoc/Writers/LaTeX.hs
+++ b/src/Text/Pandoc/Writers/LaTeX.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE PatternGuards       #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -34,6 +35,7 @@ module Text.Pandoc.Writers.LaTeX (
     writeLaTeX
   , writeBeamer
   ) where
+import Prelude
 import Control.Applicative ((<|>))
 import Control.Monad.State.Strict
 import Data.Aeson (FromJSON, object, (.=))
diff --git a/src/Text/Pandoc/Writers/Man.hs b/src/Text/Pandoc/Writers/Man.hs
index 1be955fe3..912231a88 100644
--- a/src/Text/Pandoc/Writers/Man.hs
+++ b/src/Text/Pandoc/Writers/Man.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-
 Copyright (C) 2007-2018 John MacFarlane <jgm@berkeley.edu>
@@ -30,6 +31,7 @@ Conversion of 'Pandoc' documents to groff man page format.
 
 -}
 module Text.Pandoc.Writers.Man ( writeMan) where
+import Prelude
 import Control.Monad.State.Strict
 import Data.List (intercalate, intersperse, sort, stripPrefix)
 import qualified Data.Map as Map
diff --git a/src/Text/Pandoc/Writers/Markdown.hs b/src/Text/Pandoc/Writers/Markdown.hs
index cdd8f3b66..3bfa8a012 100644
--- a/src/Text/Pandoc/Writers/Markdown.hs
+++ b/src/Text/Pandoc/Writers/Markdown.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE MultiWayIf          #-}
 {-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -34,6 +35,7 @@ Conversion of 'Pandoc' documents to markdown-formatted plain text.
 Markdown:  <http://daringfireball.net/projects/markdown/>
 -}
 module Text.Pandoc.Writers.Markdown (writeMarkdown, writePlain) where
+import Prelude
 import Control.Monad.Reader
 import Control.Monad.State.Strict
 import Data.Char (chr, isPunctuation, isSpace, ord, isAlphaNum)
diff --git a/src/Text/Pandoc/Writers/Math.hs b/src/Text/Pandoc/Writers/Math.hs
index 477f5a0b1..99d17d594 100644
--- a/src/Text/Pandoc/Writers/Math.hs
+++ b/src/Text/Pandoc/Writers/Math.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Text.Pandoc.Writers.Math
   ( texMathToInlines
   , convertMath
@@ -6,6 +7,7 @@ module Text.Pandoc.Writers.Math
   )
 where
 
+import Prelude
 import Text.Pandoc.Class
 import Text.Pandoc.Definition
 import Text.Pandoc.Logging
diff --git a/src/Text/Pandoc/Writers/MediaWiki.hs b/src/Text/Pandoc/Writers/MediaWiki.hs
index 2470d9200..df50028a0 100644
--- a/src/Text/Pandoc/Writers/MediaWiki.hs
+++ b/src/Text/Pandoc/Writers/MediaWiki.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-
 Copyright (C) 2008-2018 John MacFarlane <jgm@berkeley.edu>
 
@@ -30,6 +31,7 @@ Conversion of 'Pandoc' documents to MediaWiki markup.
 MediaWiki:  <http://www.mediawiki.org/wiki/MediaWiki>
 -}
 module Text.Pandoc.Writers.MediaWiki ( writeMediaWiki ) where
+import Prelude
 import Control.Monad.Reader
 import Control.Monad.State.Strict
 import Data.List (intercalate)
diff --git a/src/Text/Pandoc/Writers/Ms.hs b/src/Text/Pandoc/Writers/Ms.hs
index 558576876..cab44f817 100644
--- a/src/Text/Pandoc/Writers/Ms.hs
+++ b/src/Text/Pandoc/Writers/Ms.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-
 Copyright (C) 2007-2018 John MacFarlane <jgm@berkeley.edu>
 
@@ -36,6 +37,7 @@ TODO:
 -}
 
 module Text.Pandoc.Writers.Ms ( writeMs ) where
+import Prelude
 import Control.Monad.State.Strict
 import Data.Char (isLower, isUpper, toUpper, ord)
 import Data.List (intercalate, intersperse, sort)
diff --git a/src/Text/Pandoc/Writers/Muse.hs b/src/Text/Pandoc/Writers/Muse.hs
index 5dda951c5..2d53ca9a1 100644
--- a/src/Text/Pandoc/Writers/Muse.hs
+++ b/src/Text/Pandoc/Writers/Muse.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-
 Copyright (C) 2017-2018 Alexander Krotov <ilabdsf@gmail.com>
@@ -42,6 +43,7 @@ However, @\<literal style="html">@ tag is used for HTML raw blocks
 even though it is supported only in Emacs Muse.
 -}
 module Text.Pandoc.Writers.Muse (writeMuse) where
+import Prelude
 import Control.Monad.State.Strict
 import Data.Text (Text)
 import Data.List (intersperse, transpose, isInfixOf)
@@ -185,8 +187,8 @@ blockToMuse (OrderedList (start, style, _) items) = do
                               -> [Block]  -- ^ list item (list of blocks)
                               -> StateT WriterState m Doc
         orderedListItemToMuse marker item = do
-        contents <- blockListToMuse item
-        return $ hang (length marker + 1) (text marker <> space) contents
+          contents <- blockListToMuse item
+          return $ hang (length marker + 1) (text marker <> space) contents
 blockToMuse (BulletList items) = do
   contents <- mapM bulletListItemToMuse items
   -- ensure that sublists have preceding blank line
diff --git a/src/Text/Pandoc/Writers/Native.hs b/src/Text/Pandoc/Writers/Native.hs
index f852bad96..730e3800a 100644
--- a/src/Text/Pandoc/Writers/Native.hs
+++ b/src/Text/Pandoc/Writers/Native.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-
 Copyright (C) 2006-2018 John MacFarlane <jgm@berkeley.edu>
@@ -30,6 +31,7 @@ Conversion of a 'Pandoc' document to a string representation.
 -}
 module Text.Pandoc.Writers.Native ( writeNative )
 where
+import Prelude
 import Data.List (intersperse)
 import Data.Text (Text)
 import Text.Pandoc.Class (PandocMonad)
diff --git a/src/Text/Pandoc/Writers/ODT.hs b/src/Text/Pandoc/Writers/ODT.hs
index 63a3f915a..7aecb3da5 100644
--- a/src/Text/Pandoc/Writers/ODT.hs
+++ b/src/Text/Pandoc/Writers/ODT.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-
 Copyright (C) 2008-2018 John MacFarlane <jgm@berkeley.edu>
@@ -29,6 +30,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Conversion of 'Pandoc' documents to ODT.
 -}
 module Text.Pandoc.Writers.ODT ( writeODT ) where
+import Prelude
 import Codec.Archive.Zip
 import Control.Monad.Except (catchError)
 import Control.Monad.State.Strict
diff --git a/src/Text/Pandoc/Writers/OOXML.hs b/src/Text/Pandoc/Writers/OOXML.hs
index b1eaa9d25..9e1c81964 100644
--- a/src/Text/Pandoc/Writers/OOXML.hs
+++ b/src/Text/Pandoc/Writers/OOXML.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-
 Copyright (C) 2012-2018 John MacFarlane <jgm@berkeley.edu>
 
@@ -39,6 +40,7 @@ module Text.Pandoc.Writers.OOXML ( mknode
                                  , fitToPage
                                  ) where
 
+import Prelude
 import Codec.Archive.Zip
 import Control.Monad.Reader
 import qualified Data.ByteString as B
diff --git a/src/Text/Pandoc/Writers/OPML.hs b/src/Text/Pandoc/Writers/OPML.hs
index 29e1bc80c..c081b957e 100644
--- a/src/Text/Pandoc/Writers/OPML.hs
+++ b/src/Text/Pandoc/Writers/OPML.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE CPP #-}
 {-
 Copyright (C) 2013-2018 John MacFarlane <jgm@berkeley.edu>
@@ -29,6 +30,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Conversion of 'Pandoc' documents to OPML XML.
 -}
 module Text.Pandoc.Writers.OPML ( writeOPML) where
+import Prelude
 import Control.Monad.Except (throwError)
 import Data.Text (Text, unpack)
 import qualified Data.Text as T
diff --git a/src/Text/Pandoc/Writers/OpenDocument.hs b/src/Text/Pandoc/Writers/OpenDocument.hs
index 17edc0cbd..514327e9a 100644
--- a/src/Text/Pandoc/Writers/OpenDocument.hs
+++ b/src/Text/Pandoc/Writers/OpenDocument.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE FlexibleContexts  #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternGuards     #-}
@@ -32,6 +33,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Conversion of 'Pandoc' documents to OpenDocument XML.
 -}
 module Text.Pandoc.Writers.OpenDocument ( writeOpenDocument ) where
+import Prelude
 import Control.Arrow ((***), (>>>))
 import Control.Monad.State.Strict hiding (when)
 import Data.Char (chr)
diff --git a/src/Text/Pandoc/Writers/Org.hs b/src/Text/Pandoc/Writers/Org.hs
index 2307204a5..a71775e13 100644
--- a/src/Text/Pandoc/Writers/Org.hs
+++ b/src/Text/Pandoc/Writers/Org.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-
 Copyright (C) 2010-2015 Puneeth Chaganti <punchagan@gmail.com>
@@ -35,6 +36,7 @@ Conversion of 'Pandoc' documents to Emacs Org-Mode.
 Org-Mode:  <http://orgmode.org>
 -}
 module Text.Pandoc.Writers.Org (writeOrg) where
+import Prelude
 import Control.Monad.State.Strict
 import Data.Char (isAlphaNum, toLower)
 import Data.List (intersect, intersperse, isPrefixOf, partition, transpose)
diff --git a/src/Text/Pandoc/Writers/Powerpoint.hs b/src/Text/Pandoc/Writers/Powerpoint.hs
index 645a4cb86..665fd3f57 100644
--- a/src/Text/Pandoc/Writers/Powerpoint.hs
+++ b/src/Text/Pandoc/Writers/Powerpoint.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 
 
 {-
@@ -41,6 +42,7 @@ This is a wrapper around two modules:
 
 module Text.Pandoc.Writers.Powerpoint (writePowerpoint) where
 
+import Prelude
 import Codec.Archive.Zip
 import Text.Pandoc.Definition
 import Text.Pandoc.Walk
diff --git a/src/Text/Pandoc/Writers/Powerpoint/Output.hs b/src/Text/Pandoc/Writers/Powerpoint/Output.hs
index 410b6c20c..2ece78c01 100644
--- a/src/Text/Pandoc/Writers/Powerpoint/Output.hs
+++ b/src/Text/Pandoc/Writers/Powerpoint/Output.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE PatternGuards #-}
 
 {-
@@ -34,6 +35,7 @@ Text.Pandoc.Writers.Powerpoint.Presentation) to a zip archive.
 module Text.Pandoc.Writers.Powerpoint.Output ( presentationToArchive
                                              ) where
 
+import Prelude
 import Control.Monad.Except (throwError, catchError)
 import Control.Monad.Reader
 import Control.Monad.State
diff --git a/src/Text/Pandoc/Writers/Powerpoint/Presentation.hs b/src/Text/Pandoc/Writers/Powerpoint/Presentation.hs
index fcd124e76..ac6001d2b 100644
--- a/src/Text/Pandoc/Writers/Powerpoint/Presentation.hs
+++ b/src/Text/Pandoc/Writers/Powerpoint/Presentation.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE PatternGuards #-}
 
 {-
@@ -57,6 +58,7 @@ module Text.Pandoc.Writers.Powerpoint.Presentation ( documentToPresentation
                                                    ) where
 
 
+import Prelude
 import Control.Monad.Reader
 import Control.Monad.State
 import Data.List (intercalate)
diff --git a/src/Text/Pandoc/Writers/RST.hs b/src/Text/Pandoc/Writers/RST.hs
index 5c475ec23..74fc4dca4 100644
--- a/src/Text/Pandoc/Writers/RST.hs
+++ b/src/Text/Pandoc/Writers/RST.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-
 Copyright (C) 2006-2018 John MacFarlane <jgm@berkeley.edu>
@@ -31,6 +32,7 @@ Conversion of 'Pandoc' documents to reStructuredText.
 reStructuredText:  <http://docutils.sourceforge.net/rst.html>
 -}
 module Text.Pandoc.Writers.RST ( writeRST ) where
+import Prelude
 import Control.Monad.State.Strict
 import Data.Char (isSpace, toLower)
 import Data.List (isPrefixOf, stripPrefix)
diff --git a/src/Text/Pandoc/Writers/RTF.hs b/src/Text/Pandoc/Writers/RTF.hs
index 7006b58d1..3045c1c10 100644
--- a/src/Text/Pandoc/Writers/RTF.hs
+++ b/src/Text/Pandoc/Writers/RTF.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-
 Copyright (C) 2006-2018 John MacFarlane <jgm@berkeley.edu>
@@ -30,6 +31,7 @@ Conversion of 'Pandoc' documents to RTF (rich text format).
 -}
 module Text.Pandoc.Writers.RTF ( writeRTF
                                ) where
+import Prelude
 import Control.Monad.Except (catchError, throwError)
 import Control.Monad
 import qualified Data.ByteString as B
diff --git a/src/Text/Pandoc/Writers/Shared.hs b/src/Text/Pandoc/Writers/Shared.hs
index 964db5ecc..2edce7deb 100644
--- a/src/Text/Pandoc/Writers/Shared.hs
+++ b/src/Text/Pandoc/Writers/Shared.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-
 Copyright (C) 2013-2018 John MacFarlane <jgm@berkeley.edu>
@@ -44,6 +45,7 @@ module Text.Pandoc.Writers.Shared (
                      , stripLeadingTrailingSpace
                      )
 where
+import Prelude
 import Control.Monad (zipWithM)
 import Data.Aeson (FromJSON (..), Result (..), ToJSON (..), Value (Object),
                    encode, fromJSON)
diff --git a/src/Text/Pandoc/Writers/TEI.hs b/src/Text/Pandoc/Writers/TEI.hs
index 4936c743e..e461f5715 100644
--- a/src/Text/Pandoc/Writers/TEI.hs
+++ b/src/Text/Pandoc/Writers/TEI.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternGuards     #-}
 {-
@@ -30,6 +31,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Conversion of 'Pandoc' documents to Docbook XML.
 -}
 module Text.Pandoc.Writers.TEI (writeTEI) where
+import Prelude
 import Data.Char (toLower)
 import Data.List (isPrefixOf, stripPrefix)
 import Data.Text (Text)
diff --git a/src/Text/Pandoc/Writers/Texinfo.hs b/src/Text/Pandoc/Writers/Texinfo.hs
index bf434642e..305b41206 100644
--- a/src/Text/Pandoc/Writers/Texinfo.hs
+++ b/src/Text/Pandoc/Writers/Texinfo.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-
 Copyright (C) 2008-2018 John MacFarlane
@@ -31,6 +32,7 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Conversion of 'Pandoc' format into Texinfo.
 -}
 module Text.Pandoc.Writers.Texinfo ( writeTexinfo ) where
+import Prelude
 import Control.Monad.Except (throwError)
 import Control.Monad.State.Strict
 import Data.Char (chr, ord)
diff --git a/src/Text/Pandoc/Writers/Textile.hs b/src/Text/Pandoc/Writers/Textile.hs
index f46eb43bc..0ed79d2df 100644
--- a/src/Text/Pandoc/Writers/Textile.hs
+++ b/src/Text/Pandoc/Writers/Textile.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-
 Copyright (C) 2010-2018 John MacFarlane <jgm@berkeley.edu>
 
@@ -30,6 +31,7 @@ Conversion of 'Pandoc' documents to Textile markup.
 Textile:  <http://thresholdstate.com/articles/4312/the-textile-reference-manual>
 -}
 module Text.Pandoc.Writers.Textile ( writeTextile ) where
+import Prelude
 import Control.Monad.State.Strict
 import Data.Char (isSpace)
 import Data.List (intercalate)
diff --git a/src/Text/Pandoc/Writers/ZimWiki.hs b/src/Text/Pandoc/Writers/ZimWiki.hs
index dec1f9d4a..a583b07b1 100644
--- a/src/Text/Pandoc/Writers/ZimWiki.hs
+++ b/src/Text/Pandoc/Writers/ZimWiki.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-
 Copyright (C) 2008-2018 John MacFarlane <jgm@berkeley.edu>
               2017-2018 Alex Ivkin
@@ -32,6 +33,7 @@ http://zim-wiki.org/manual/Help/Wiki_Syntax.html
 -}
 
 module Text.Pandoc.Writers.ZimWiki ( writeZimWiki ) where
+import Prelude
 import Control.Monad (zipWithM)
 import Control.Monad.State.Strict (StateT, evalStateT, gets, modify)
 import Data.Default (Default (..))