Use NoImplicitPrelude and explicitly import Prelude.

This seems to be necessary if we are to use our custom Prelude
with ghci.

Closes #4464.

47 files changed, 94 insertions, 0 deletions

diff --git a/test/Tests/Command.hs b/test/Tests/Command.hs
index de83d0639..89ea9a741 100644
--- a/test/Tests/Command.hs
+++ b/test/Tests/Command.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Command (findPandoc, runTest, tests)
 where
 
+import Prelude
 import Data.Algorithm.Diff
 import qualified Data.ByteString as BS
 import Data.List (isSuffixOf)
diff --git a/test/Tests/Helpers.hs b/test/Tests/Helpers.hs
index 2a6543ea0..1c031aa64 100644
--- a/test/Tests/Helpers.hs
+++ b/test/Tests/Helpers.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE FlexibleInstances    #-}
 {-# LANGUAGE TypeSynonymInstances #-}
 -- Utility functions for the test suite.
@@ -13,6 +14,7 @@ module Tests.Helpers ( test
                      )
                      where
 
+import Prelude
 import Data.Algorithm.Diff
 import qualified Data.Map as M
 import Data.Text (Text, unpack)
diff --git a/test/Tests/Lua.hs b/test/Tests/Lua.hs
index 5fe015265..b401e4e65 100644
--- a/test/Tests/Lua.hs
+++ b/test/Tests/Lua.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Lua ( tests ) where
 
+import Prelude
 import Control.Monad (when)
 import Data.Version (Version (versionBranch))
 import System.FilePath ((</>))
diff --git a/test/Tests/Old.hs b/test/Tests/Old.hs
index ed4dcc076..f2b43640b 100644
--- a/test/Tests/Old.hs
+++ b/test/Tests/Old.hs
@@ -1,5 +1,7 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Old (tests) where
 
+import Prelude
 import Data.Algorithm.Diff
 import Prelude hiding (readFile)
 import System.Exit
diff --git a/test/Tests/Readers/Creole.hs b/test/Tests/Readers/Creole.hs
index 3f60a523d..eb50b2b9a 100644
--- a/test/Tests/Readers/Creole.hs
+++ b/test/Tests/Readers/Creole.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Creole (tests) where
 
+import Prelude
 import Data.Text (Text)
 import qualified Data.Text as T
 import Test.Tasty
diff --git a/test/Tests/Readers/Docx.hs b/test/Tests/Readers/Docx.hs
index 9bbe85cba..4f2ad524a 100644
--- a/test/Tests/Readers/Docx.hs
+++ b/test/Tests/Readers/Docx.hs
@@ -1,5 +1,7 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Readers.Docx (tests) where
 
+import Prelude
 import Codec.Archive.Zip
 import qualified Data.ByteString as BS
 import qualified Data.ByteString.Lazy as B
diff --git a/test/Tests/Readers/EPUB.hs b/test/Tests/Readers/EPUB.hs
index 1337a9c11..285efedbf 100644
--- a/test/Tests/Readers/EPUB.hs
+++ b/test/Tests/Readers/EPUB.hs
@@ -1,5 +1,7 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Readers.EPUB (tests) where
 
+import Prelude
 import qualified Data.ByteString.Lazy as BL
 import Test.Tasty
 import Test.Tasty.HUnit
diff --git a/test/Tests/Readers/HTML.hs b/test/Tests/Readers/HTML.hs
index 70f33d2b2..f61f1f497 100644
--- a/test/Tests/Readers/HTML.hs
+++ b/test/Tests/Readers/HTML.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.HTML (tests) where
 
+import Prelude
 import Data.Text (Text)
 import Test.Tasty
 import Tests.Helpers
diff --git a/test/Tests/Readers/JATS.hs b/test/Tests/Readers/JATS.hs
index 5c7dfa77c..83c7c0da5 100644
--- a/test/Tests/Readers/JATS.hs
+++ b/test/Tests/Readers/JATS.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.JATS (tests) where
 
+import Prelude
 import Data.Text (Text)
 import Test.Tasty
 import Tests.Helpers
diff --git a/test/Tests/Readers/LaTeX.hs b/test/Tests/Readers/LaTeX.hs
index 4396d550f..1538b6b0a 100644
--- a/test/Tests/Readers/LaTeX.hs
+++ b/test/Tests/Readers/LaTeX.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.LaTeX (tests) where
 
+import Prelude
 import Data.Text (Text)
 import qualified Data.Text as T
 import qualified Text.Pandoc.UTF8 as UTF8
diff --git a/test/Tests/Readers/Markdown.hs b/test/Tests/Readers/Markdown.hs
index 1cd32b87d..0943aa4b1 100644
--- a/test/Tests/Readers/Markdown.hs
+++ b/test/Tests/Readers/Markdown.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Markdown (tests) where
 
+import Prelude
 import Data.Text (Text, unpack)
 import qualified Data.Text as T
 import Test.Tasty
diff --git a/test/Tests/Readers/Muse.hs b/test/Tests/Readers/Muse.hs
index 89dbbc345..f1baa254d 100644
--- a/test/Tests/Readers/Muse.hs
+++ b/test/Tests/Readers/Muse.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Muse (tests) where
 
+import Prelude
 import Data.List (intersperse)
 import Data.Text (Text)
 import qualified Data.Text as T
diff --git a/test/Tests/Readers/Odt.hs b/test/Tests/Readers/Odt.hs
index 4b7058cf9..c7f9a0725 100644
--- a/test/Tests/Readers/Odt.hs
+++ b/test/Tests/Readers/Odt.hs
@@ -1,5 +1,7 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Readers.Odt (tests) where
 
+import Prelude
 import Control.Monad (liftM)
 import qualified Data.ByteString as BS
 import qualified Data.ByteString.Lazy as B
diff --git a/test/Tests/Readers/Org/Block.hs b/test/Tests/Readers/Org/Block.hs
index 15dc63554..b1c86eada 100644
--- a/test/Tests/Readers/Org/Block.hs
+++ b/test/Tests/Readers/Org/Block.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Block (tests) where
 
+import Prelude
 import Test.Tasty (TestTree, testGroup)
 import Tests.Helpers ((=?>))
 import Tests.Readers.Org.Shared ((=:), spcSep)
diff --git a/test/Tests/Readers/Org/Block/CodeBlock.hs b/test/Tests/Readers/Org/Block/CodeBlock.hs
index 8fa822089..a54ef6a17 100644
--- a/test/Tests/Readers/Org/Block/CodeBlock.hs
+++ b/test/Tests/Readers/Org/Block/CodeBlock.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Block.CodeBlock (tests) where
 
+import Prelude
 import Test.Tasty (TestTree)
 import Tests.Helpers ((=?>))
 import Tests.Readers.Org.Shared ((=:), spcSep)
diff --git a/test/Tests/Readers/Org/Block/Figure.hs b/test/Tests/Readers/Org/Block/Figure.hs
index cae6ef179..bead135e9 100644
--- a/test/Tests/Readers/Org/Block/Figure.hs
+++ b/test/Tests/Readers/Org/Block/Figure.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Block.Figure (tests) where
 
+import Prelude
 import Test.Tasty (TestTree)
 import Tests.Helpers ((=?>))
 import Tests.Readers.Org.Shared ((=:))
diff --git a/test/Tests/Readers/Org/Block/Header.hs b/test/Tests/Readers/Org/Block/Header.hs
index e8ad88558..3b0d7dda9 100644
--- a/test/Tests/Readers/Org/Block/Header.hs
+++ b/test/Tests/Readers/Org/Block/Header.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Block.Header (tests) where
 
+import Prelude
 import Test.Tasty (TestTree, testGroup)
 import Tests.Helpers ((=?>))
 import Tests.Readers.Org.Shared ((=:), spcSep, tagSpan)
diff --git a/test/Tests/Readers/Org/Block/List.hs b/test/Tests/Readers/Org/Block/List.hs
index 343682a80..f273b684d 100644
--- a/test/Tests/Readers/Org/Block/List.hs
+++ b/test/Tests/Readers/Org/Block/List.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Block.List (tests) where
 
+import Prelude
 import Test.Tasty (TestTree)
 import Tests.Helpers ((=?>))
 import Tests.Readers.Org.Shared ((=:), spcSep)
diff --git a/test/Tests/Readers/Org/Block/Table.hs b/test/Tests/Readers/Org/Block/Table.hs
index db6e756f8..3cb6bb0f0 100644
--- a/test/Tests/Readers/Org/Block/Table.hs
+++ b/test/Tests/Readers/Org/Block/Table.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Block.Table (tests) where
 
+import Prelude
 import Test.Tasty (TestTree)
 import Tests.Helpers ((=?>))
 import Tests.Readers.Org.Shared ((=:), spcSep)
diff --git a/test/Tests/Readers/Org/Directive.hs b/test/Tests/Readers/Org/Directive.hs
index 7e2c0fb8d..bb9c52e69 100644
--- a/test/Tests/Readers/Org/Directive.hs
+++ b/test/Tests/Readers/Org/Directive.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Directive (tests) where
 
+import Prelude
 import Data.Time (UTCTime (UTCTime), secondsToDiffTime)
 import Data.Time.Calendar (Day (ModifiedJulianDay))
 import Test.Tasty (TestTree, testGroup)
diff --git a/test/Tests/Readers/Org/Inline.hs b/test/Tests/Readers/Org/Inline.hs
index 9bf5556d2..07fe2d2e9 100644
--- a/test/Tests/Readers/Org/Inline.hs
+++ b/test/Tests/Readers/Org/Inline.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Inline (tests) where
 
+import Prelude
 import Data.List (intersperse)
 import Test.Tasty (TestTree, testGroup)
 import Tests.Helpers ((=?>))
diff --git a/test/Tests/Readers/Org/Inline/Citation.hs b/test/Tests/Readers/Org/Inline/Citation.hs
index d7e38a6b0..c7974efa0 100644
--- a/test/Tests/Readers/Org/Inline/Citation.hs
+++ b/test/Tests/Readers/Org/Inline/Citation.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Inline.Citation (tests) where
 
+import Prelude
 import Test.Tasty (TestTree, testGroup)
 import Tests.Helpers ((=?>))
 import Tests.Readers.Org.Shared ((=:))
diff --git a/test/Tests/Readers/Org/Inline/Note.hs b/test/Tests/Readers/Org/Inline/Note.hs
index 9eb1d02d6..1e0a59cb4 100644
--- a/test/Tests/Readers/Org/Inline/Note.hs
+++ b/test/Tests/Readers/Org/Inline/Note.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Inline.Note (tests) where
 
+import Prelude
 import Test.Tasty (TestTree)
 import Tests.Helpers ((=?>))
 import Tests.Readers.Org.Shared ((=:))
diff --git a/test/Tests/Readers/Org/Inline/Smart.hs b/test/Tests/Readers/Org/Inline/Smart.hs
index 77f10699d..b2889f8fe 100644
--- a/test/Tests/Readers/Org/Inline/Smart.hs
+++ b/test/Tests/Readers/Org/Inline/Smart.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Inline.Smart (tests) where
 
+import Prelude
 import Data.Text (Text)
 import Test.Tasty (TestTree)
 import Tests.Helpers ((=?>), purely, test)
diff --git a/test/Tests/Readers/Org/Meta.hs b/test/Tests/Readers/Org/Meta.hs
index 6bd1b02e7..b17a05fe1 100644
--- a/test/Tests/Readers/Org/Meta.hs
+++ b/test/Tests/Readers/Org/Meta.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Org.Meta (tests) where
 
+import Prelude
 import Test.Tasty (TestTree, testGroup)
 import Tests.Helpers ((=?>))
 import Tests.Readers.Org.Shared ((=:), spcSep)
diff --git a/test/Tests/Readers/Org/Shared.hs b/test/Tests/Readers/Org/Shared.hs
index 5e8f6dd54..ea2a97e49 100644
--- a/test/Tests/Readers/Org/Shared.hs
+++ b/test/Tests/Readers/Org/Shared.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Readers.Org.Shared
   ( (=:)
   , org
@@ -5,6 +6,7 @@ module Tests.Readers.Org.Shared
   , tagSpan
   ) where
 
+import Prelude
 import Data.List (intersperse)
 import Data.Text (Text)
 import Tests.Helpers (ToString, purely, test)
diff --git a/test/Tests/Readers/RST.hs b/test/Tests/Readers/RST.hs
index 305c7060b..906ed4ff9 100644
--- a/test/Tests/Readers/RST.hs
+++ b/test/Tests/Readers/RST.hs
@@ -1,7 +1,9 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 module Tests.Readers.RST (tests) where
 
+import Prelude
 import Data.Text (Text)
 import qualified Data.Text as T
 import Test.Tasty
diff --git a/test/Tests/Readers/Txt2Tags.hs b/test/Tests/Readers/Txt2Tags.hs
index e3646e95e..f0efbb02e 100644
--- a/test/Tests/Readers/Txt2Tags.hs
+++ b/test/Tests/Readers/Txt2Tags.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Readers.Txt2Tags (tests) where
 
+import Prelude
 import Data.List (intersperse)
 import Data.Text (Text)
 import qualified Data.Text as T
diff --git a/test/Tests/Shared.hs b/test/Tests/Shared.hs
index cc448419c..85f7aae67 100644
--- a/test/Tests/Shared.hs
+++ b/test/Tests/Shared.hs
@@ -1,5 +1,7 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Shared (tests) where
 
+import Prelude
 import System.FilePath.Posix (joinPath)
 import Test.Tasty
 import Test.Tasty.HUnit (assertBool, testCase, (@?=))
diff --git a/test/Tests/Writers/AsciiDoc.hs b/test/Tests/Writers/AsciiDoc.hs
index 6b97c0761..d31d4ffe2 100644
--- a/test/Tests/Writers/AsciiDoc.hs
+++ b/test/Tests/Writers/AsciiDoc.hs
@@ -1,5 +1,7 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Writers.AsciiDoc (tests) where
 
+import Prelude
 import Data.Text (unpack)
 import Test.Tasty
 import Tests.Helpers
diff --git a/test/Tests/Writers/ConTeXt.hs b/test/Tests/Writers/ConTeXt.hs
index 812aab4a6..fa1782391 100644
--- a/test/Tests/Writers/ConTeXt.hs
+++ b/test/Tests/Writers/ConTeXt.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Writers.ConTeXt (tests) where
 
+import Prelude
 import Data.Text (unpack)
 import Test.Tasty
 import Test.Tasty.QuickCheck
diff --git a/test/Tests/Writers/Docbook.hs b/test/Tests/Writers/Docbook.hs
index 89ea76586..f6a047b0b 100644
--- a/test/Tests/Writers/Docbook.hs
+++ b/test/Tests/Writers/Docbook.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Writers.Docbook (tests) where
 
+import Prelude
 import Data.Text (unpack)
 import Test.Tasty
 import Tests.Helpers
diff --git a/test/Tests/Writers/Docx.hs b/test/Tests/Writers/Docx.hs
index 3ded0aa38..d17984d63 100644
--- a/test/Tests/Writers/Docx.hs
+++ b/test/Tests/Writers/Docx.hs
@@ -1,5 +1,7 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Writers.Docx (tests) where
 
+import Prelude
 import Text.Pandoc
 import Test.Tasty
 import Tests.Writers.OOXML
diff --git a/test/Tests/Writers/FB2.hs b/test/Tests/Writers/FB2.hs
index 6663c42f8..5a04d9159 100644
--- a/test/Tests/Writers/FB2.hs
+++ b/test/Tests/Writers/FB2.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Writers.FB2 (tests) where
 
+import Prelude
 import Test.Tasty
 import Tests.Helpers
 import Text.Pandoc
diff --git a/test/Tests/Writers/HTML.hs b/test/Tests/Writers/HTML.hs
index 23ff718d3..e771255b3 100644
--- a/test/Tests/Writers/HTML.hs
+++ b/test/Tests/Writers/HTML.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Writers.HTML (tests) where
 
+import Prelude
 import Data.Text (unpack)
 import Test.Tasty
 import Tests.Helpers
diff --git a/test/Tests/Writers/JATS.hs b/test/Tests/Writers/JATS.hs
index 723c0e8a8..669220eea 100644
--- a/test/Tests/Writers/JATS.hs
+++ b/test/Tests/Writers/JATS.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Writers.JATS (tests) where
 
+import Prelude
 import Data.Text (unpack)
 import Test.Tasty
 import Tests.Helpers
diff --git a/test/Tests/Writers/LaTeX.hs b/test/Tests/Writers/LaTeX.hs
index 471d9d9e7..00150022f 100644
--- a/test/Tests/Writers/LaTeX.hs
+++ b/test/Tests/Writers/LaTeX.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Writers.LaTeX (tests) where
 
+import Prelude
 import Data.Text (unpack)
 import Test.Tasty
 import Tests.Helpers
diff --git a/test/Tests/Writers/Markdown.hs b/test/Tests/Writers/Markdown.hs
index 7f9ac3627..533be268a 100644
--- a/test/Tests/Writers/Markdown.hs
+++ b/test/Tests/Writers/Markdown.hs
@@ -1,7 +1,9 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# OPTIONS_GHC -fno-warn-name-shadowing #-}
 module Tests.Writers.Markdown (tests) where
 
+import Prelude
 import Data.Text (unpack)
 import Test.Tasty
 import Tests.Helpers
diff --git a/test/Tests/Writers/Muse.hs b/test/Tests/Writers/Muse.hs
index b86dee5e1..acd834173 100644
--- a/test/Tests/Writers/Muse.hs
+++ b/test/Tests/Writers/Muse.hs
@@ -1,5 +1,7 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Writers.Muse (tests) where
 
+import Prelude
 import Data.Text (unpack)
 import Test.Tasty
 import Tests.Helpers
diff --git a/test/Tests/Writers/Native.hs b/test/Tests/Writers/Native.hs
index 0c4bf7623..708b5069c 100644
--- a/test/Tests/Writers/Native.hs
+++ b/test/Tests/Writers/Native.hs
@@ -1,5 +1,7 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Writers.Native (tests) where
 
+import Prelude
 import Data.Text (unpack)
 import Test.Tasty
 import Test.Tasty.QuickCheck
diff --git a/test/Tests/Writers/OOXML.hs b/test/Tests/Writers/OOXML.hs
index bdfdea145..f2762ddfe 100644
--- a/test/Tests/Writers/OOXML.hs
+++ b/test/Tests/Writers/OOXML.hs
@@ -1,8 +1,10 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE PatternGuards     #-}
 {-# LANGUAGE OverloadedStrings #-}
 
 module Tests.Writers.OOXML (ooxmlTest) where
 
+import Prelude
 import Text.Pandoc
 import Test.Tasty
 import Test.Tasty.Golden.Advanced
diff --git a/test/Tests/Writers/Org.hs b/test/Tests/Writers/Org.hs
index 9cbe360da..c99f7344d 100644
--- a/test/Tests/Writers/Org.hs
+++ b/test/Tests/Writers/Org.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Writers.Org (tests) where
 
+import Prelude
 import Test.Tasty
 import Tests.Helpers
 import Text.Pandoc
diff --git a/test/Tests/Writers/Plain.hs b/test/Tests/Writers/Plain.hs
index ab09bca26..2a2eb4226 100644
--- a/test/Tests/Writers/Plain.hs
+++ b/test/Tests/Writers/Plain.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Writers.Plain (tests) where
 
+import Prelude
 import Test.Tasty
 import Tests.Helpers
 import Text.Pandoc
diff --git a/test/Tests/Writers/Powerpoint.hs b/test/Tests/Writers/Powerpoint.hs
index 9af8fc471..b5620ffdb 100644
--- a/test/Tests/Writers/Powerpoint.hs
+++ b/test/Tests/Writers/Powerpoint.hs
@@ -1,5 +1,7 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 module Tests.Writers.Powerpoint (tests) where
 
+import Prelude
 import Tests.Writers.OOXML (ooxmlTest)
 import Text.Pandoc
 import Test.Tasty
diff --git a/test/Tests/Writers/RST.hs b/test/Tests/Writers/RST.hs
index e54ce4737..64367a108 100644
--- a/test/Tests/Writers/RST.hs
+++ b/test/Tests/Writers/RST.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Writers.RST (tests) where
 
+import Prelude
 import Test.Tasty
 import Tests.Helpers
 import Text.Pandoc
diff --git a/test/Tests/Writers/TEI.hs b/test/Tests/Writers/TEI.hs
index fa372909f..31e970495 100644
--- a/test/Tests/Writers/TEI.hs
+++ b/test/Tests/Writers/TEI.hs
@@ -1,6 +1,8 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Tests.Writers.TEI (tests) where
 
+import Prelude
 import Test.Tasty
 import Tests.Helpers
 import Text.Pandoc
diff --git a/test/test-pandoc.hs b/test/test-pandoc.hs
index 4cf1a952d..8613d5dda 100644
--- a/test/test-pandoc.hs
+++ b/test/test-pandoc.hs
@@ -1,7 +1,9 @@
+{-# LANGUAGE NoImplicitPrelude #-}
 {-# OPTIONS_GHC -Wall #-}
 
 module Main where
 
+import Prelude
 import GHC.IO.Encoding
 import Test.Tasty
 import qualified Tests.Command