Remove custom prelude and ghc 7.8 support.

.travis.yml

@@ -31,10 +31,6 @@ matrix:
   include:
   # We grab the appropriate GHC and cabal-install versions from hvr's PPA. See:
   # https://github.com/hvr/multi-ghc-travis
-  - env: BUILD=cabal GHCVER=7.8.4 CABALVER=1.18 OPTS="-O0 -Wall -fno-warn-unused-do-bind -Werror" FLAGS="fast embed_data_files" CABALARGS="--enable-benchmarks"
-    compiler: ": #GHC 7.8.4"
-    addons: {apt: {packages: [cabal-install-1.18,ghc-7.8.4,happy-1.19.5], sources: [hvr-ghc]}}
-
   # don't build benchmarks for ghc 7.10.3, because build takes too long...
   - env: BUILD=cabal GHCVER=7.10.3 CABALVER=1.22 OPTS="-O0 -Wall -fno-warn-unused-do-bind -Werror" FLAGS="fast embed_data_files" CABALARGS=""
     compiler: ": #GHC 7.10.3"

INSTALL.md

@@ -137,7 +137,7 @@ The easiest way to build pandoc from source is to use [stack]:
 
 1.  Install the [Haskell platform].  This will give you [GHC] and
     the [cabal-install] build tool.  Note that pandoc requires
-    GHC >= 7.8.
+    GHC >= 7.10.
 
 2.  Update your package database:
 

pandoc.cabal

@@ -11,7 +11,7 @@ bug-reports:     https://github.com/jgm/pandoc/issues
 stability:       alpha
 homepage:        http://pandoc.org
 category:        Text
-tested-with:     GHC == 7.8.4, GHC == 7.10.3, GHC == 8.0.2, GHC == 8.2.2
+tested-with:     GHC == 7.10.3, GHC == 8.0.2, GHC == 8.2.2
 synopsis:        Conversion between markup formats
 description:     Pandoc is a Haskell library for converting from one markup
                  format to another, and a command-line tool that uses
@@ -415,10 +415,6 @@ library
                       RelaxedPolyRec, DeriveDataTypeable, TypeSynonymInstances,
                       FlexibleInstances
   hs-source-dirs:  src
-  if impl(ghc < 7.10)
-     hs-source-dirs: prelude
-     other-modules:  Prelude
-     build-depends:  base-compat >= 0.9
 
   exposed-modules: Text.Pandoc,
                    Text.Pandoc.App,
@@ -560,10 +556,6 @@ executable pandoc
                     RelaxedPolyRec, DeriveDataTypeable, TypeSynonymInstances,
                     FlexibleInstances
   hs-source-dirs:  .
-  if impl(ghc < 7.10)
-     hs-source-dirs: prelude
-     other-modules:  Prelude
-     build-depends:  base-compat >= 0.9
   main-is:         pandoc.hs
   buildable:       True
   other-modules:   Paths_pandoc
@@ -571,10 +563,6 @@ executable pandoc
 executable trypandoc
   main-is:         trypandoc.hs
   hs-source-dirs:  trypandoc
-  if impl(ghc < 7.10)
-     hs-source-dirs: prelude
-     other-modules:  Prelude
-     build-depends:  base-compat >= 0.9
   default-language: Haskell2010
   if flag(trypandoc)
     build-depends: base, aeson, pandoc,
@@ -586,10 +574,6 @@ executable trypandoc
 executable weigh-pandoc
   main-is:         weigh-pandoc.hs
   hs-source-dirs:  benchmark
-  if impl(ghc < 7.10)
-     hs-source-dirs: prelude
-     other-modules:  Prelude
-     build-depends:  base-compat >= 0.9
   if flag(weigh-pandoc)
      build-depends:   pandoc,
                       base >= 4.2 && < 5,
@@ -606,10 +590,6 @@ test-suite test-pandoc
   type:           exitcode-stdio-1.0
   main-is:        test-pandoc.hs
   hs-source-dirs: test
-  if impl(ghc < 7.10)
-     hs-source-dirs: prelude
-     other-modules:  Prelude
-     build-depends:  base-compat >= 0.9
   build-depends:  base >= 4.2 && < 5,
                   pandoc,
                   pandoc-types >= 1.17.3 && < 1.18,
@@ -689,10 +669,6 @@ benchmark benchmark-pandoc
   type:            exitcode-stdio-1.0
   main-is:         benchmark-pandoc.hs
   hs-source-dirs:  benchmark
-  if impl(ghc < 7.10)
-     hs-source-dirs: prelude
-     other-modules:  Prelude
-     build-depends:  base-compat >= 0.9
   build-depends:   pandoc,
                    time, bytestring, containers,
                    base >= 4.2 && < 5,

prelude/Prelude.hs

@@ -1,16 +0,0 @@
-{-# LANGUAGE NoImplicitPrelude #-}
-{-# LANGUAGE PackageImports #-}
-{-# LANGUAGE CPP #-}
-
--- This custom Prelude emulates the API of the prelude
--- with base 4.8.
-
-module Prelude
-(
-  module Prelude.Compat
-, module Data.Monoid.Compat
-)
-where
-
-import Prelude.Compat
-import Data.Monoid.Compat