Use implicit Prelude (#6187)

* Use implicit Prelude

The previous behavior was introduced as a fix for #4464. It seems that
this change alone did not fix the issue, and `stack ghci` and `cabal
repl` only work with GHC 8.4.1 or newer, as no custom Prelude is loaded
for these versions. Given this, it seems cleaner to revert to the
implicit Prelude.

* PandocMonad: remove outdated check for base version

Only base versions 4.9 and later are supported, the check for
`MIN_VERSION_base(4,8,0)` is therefore unnecessary.

* Always use custom prelude

Previously, the custom prelude was used only with older GHC versions, as
a workaround for problems with ghci. The ghci problems are resolved by
replacing package `base` with `base-noprelude`, allowing for consistent
use of the custom prelude across all GHC versions.

9 files changed, 0 insertions, 18 deletions

diff --git a/src/Text/Pandoc/Readers/Org/BlockStarts.hs b/src/Text/Pandoc/Readers/Org/BlockStarts.hs
index 9e5b63a24..8f7cac6ea 100644
--- a/src/Text/Pandoc/Readers/Org/BlockStarts.hs
+++ b/src/Text/Pandoc/Readers/Org/BlockStarts.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {- |
    Module      : Text.Pandoc.Readers.Org.BlockStarts
@@ -24,7 +23,6 @@ module Text.Pandoc.Readers.Org.BlockStarts
   , endOfBlock
   ) where
 
-import Prelude
 import Control.Monad (void)
 import Data.Text (Text)
 import qualified Data.Text as T
diff --git a/src/Text/Pandoc/Readers/Org/Blocks.hs b/src/Text/Pandoc/Readers/Org/Blocks.hs
index 055dbedbb..71298c1d1 100644
--- a/src/Text/Pandoc/Readers/Org/Blocks.hs
+++ b/src/Text/Pandoc/Readers/Org/Blocks.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE FlexibleContexts  #-}
 {-# LANGUAGE RecordWildCards   #-}
 {-# LANGUAGE OverloadedStrings #-}
@@ -16,7 +15,6 @@ module Text.Pandoc.Readers.Org.Blocks
   , meta
   ) where
 
-import Prelude
 import Text.Pandoc.Readers.Org.BlockStarts
 import Text.Pandoc.Readers.Org.DocumentTree (documentTree,
                                              unprunedHeadlineToBlocks)
diff --git a/src/Text/Pandoc/Readers/Org/DocumentTree.hs b/src/Text/Pandoc/Readers/Org/DocumentTree.hs
index c406c4367..36d270b2e 100644
--- a/src/Text/Pandoc/Readers/Org/DocumentTree.hs
+++ b/src/Text/Pandoc/Readers/Org/DocumentTree.hs
@@ -1,5 +1,4 @@
 {-# LANGUAGE FlexibleContexts  #-}
-{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE TupleSections     #-}
 {- |
@@ -16,7 +15,6 @@ module Text.Pandoc.Readers.Org.DocumentTree
   , unprunedHeadlineToBlocks
   ) where
 
-import Prelude
 import Control.Arrow ((***), first)
 import Control.Monad (guard)
 import Data.List (intersperse)
diff --git a/src/Text/Pandoc/Readers/Org/ExportSettings.hs b/src/Text/Pandoc/Readers/Org/ExportSettings.hs
index 186bbcc31..dbd56970e 100644
--- a/src/Text/Pandoc/Readers/Org/ExportSettings.hs
+++ b/src/Text/Pandoc/Readers/Org/ExportSettings.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {- |
    Module      : Text.Pandoc.Readers.Org.ExportSettings
@@ -13,7 +12,6 @@ module Text.Pandoc.Readers.Org.ExportSettings
   ( exportSettings
   ) where
 
-import Prelude
 import Text.Pandoc.Class (PandocMonad, report)
 import Text.Pandoc.Logging (LogMessage (UnknownOrgExportOption))
 import Text.Pandoc.Readers.Org.ParserState
diff --git a/src/Text/Pandoc/Readers/Org/Inlines.hs b/src/Text/Pandoc/Readers/Org/Inlines.hs
index a549be08a..725b6da72 100644
--- a/src/Text/Pandoc/Readers/Org/Inlines.hs
+++ b/src/Text/Pandoc/Readers/Org/Inlines.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {- |
    Module      : Text.Pandoc.Readers.Org.Inlines
@@ -16,7 +15,6 @@ module Text.Pandoc.Readers.Org.Inlines
   , linkTarget
   ) where
 
-import Prelude
 import Text.Pandoc.Readers.Org.BlockStarts (endOfBlock, noteMarker)
 import Text.Pandoc.Readers.Org.ParserState
 import Text.Pandoc.Readers.Org.Parsing
diff --git a/src/Text/Pandoc/Readers/Org/Meta.hs b/src/Text/Pandoc/Readers/Org/Meta.hs
index a0ea97296..7c158f492 100644
--- a/src/Text/Pandoc/Readers/Org/Meta.hs
+++ b/src/Text/Pandoc/Readers/Org/Meta.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE FlexibleContexts  #-}
 {-# LANGUAGE TupleSections     #-}
 {-# LANGUAGE OverloadedStrings #-}
@@ -17,7 +16,6 @@ module Text.Pandoc.Readers.Org.Meta
   , metaLine
   ) where
 
-import Prelude
 import Text.Pandoc.Readers.Org.BlockStarts
 import Text.Pandoc.Readers.Org.ExportSettings (exportSettings)
 import Text.Pandoc.Readers.Org.Inlines
diff --git a/src/Text/Pandoc/Readers/Org/ParserState.hs b/src/Text/Pandoc/Readers/Org/ParserState.hs
index e09080199..0e2175da9 100644
--- a/src/Text/Pandoc/Readers/Org/ParserState.hs
+++ b/src/Text/Pandoc/Readers/Org/ParserState.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE NoImplicitPrelude     #-}
 {-# LANGUAGE FlexibleInstances     #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE OverloadedStrings     #-}
@@ -39,7 +38,6 @@ module Text.Pandoc.Readers.Org.ParserState
   , optionsToParserState
   ) where
 
-import Prelude
 import Control.Monad.Reader (ReaderT, asks, local)
 
 import Data.Default (Default (..))
diff --git a/src/Text/Pandoc/Readers/Org/Parsing.hs b/src/Text/Pandoc/Readers/Org/Parsing.hs
index 39a4740a6..bce71c24d 100644
--- a/src/Text/Pandoc/Readers/Org/Parsing.hs
+++ b/src/Text/Pandoc/Readers/Org/Parsing.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE NoImplicitPrelude #-}
 {- |
    Module      : Text.Pandoc.Readers.Org.Parsing
    Copyright   : Copyright (C) 2014-2020 Albert Krewinkel
@@ -104,7 +103,6 @@ module Text.Pandoc.Readers.Org.Parsing
   , getPosition
   ) where
 
-import Prelude
 import Data.Text (Text)
 import Text.Pandoc.Readers.Org.ParserState
 
diff --git a/src/Text/Pandoc/Readers/Org/Shared.hs b/src/Text/Pandoc/Readers/Org/Shared.hs
index e811131da..7ddf3738f 100644
--- a/src/Text/Pandoc/Readers/Org/Shared.hs
+++ b/src/Text/Pandoc/Readers/Org/Shared.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE NoImplicitPrelude #-}
 {-# LANGUAGE OverloadedStrings #-}
 {- |
    Module      : Text.Pandoc.Readers.Org.Shared
@@ -17,7 +16,6 @@ module Text.Pandoc.Readers.Org.Shared
   , exportsCode
   ) where
 
-import Prelude
 import Data.Char (isAlphaNum)
 import Data.Text (Text)
 import qualified Data.Text as T