move CPP from the .cabal file to each .hs file

This makes it easier for some tools to determine all the language
extensions which apply.

Author: gelisam

package.yaml

@@ -33,7 +33,6 @@ library:
     - containers >= 0.6.2.1
     - term-rewriting >= 0.3.0.1
     - transformers >= 0.5.6.2
-  default-extensions:  CPP
 
 tests:
   should-compile:

src/TypeLevel/Rewrite.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE LambdaCase, OverloadedStrings, RecordWildCards, ViewPatterns #-}
+{-# LANGUAGE CPP, LambdaCase, OverloadedStrings, RecordWildCards, ViewPatterns #-}
 module TypeLevel.Rewrite (plugin) where
 
 import Control.Monad

src/TypeLevel/Rewrite/Internal/ApplyRules.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE LambdaCase, TupleSections, ViewPatterns #-}
+{-# LANGUAGE CPP, LambdaCase, TupleSections, ViewPatterns #-}
 {-# OPTIONS -Wno-name-shadowing #-}
 module TypeLevel.Rewrite.Internal.ApplyRules where
 

src/TypeLevel/Rewrite/Internal/DecomposedConstraint.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE DeriveFunctor, DeriveFoldable, DeriveTraversable, LambdaCase, RecordWildCards, ViewPatterns #-}
+{-# LANGUAGE CPP, DeriveFunctor, DeriveFoldable, DeriveTraversable, LambdaCase, RecordWildCards, ViewPatterns #-}
 module TypeLevel.Rewrite.Internal.DecomposedConstraint where
 
 import Control.Applicative

src/TypeLevel/Rewrite/Internal/Lookup.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE LambdaCase, ViewPatterns #-}
+{-# LANGUAGE CPP, LambdaCase, ViewPatterns #-}
 module TypeLevel.Rewrite.Internal.Lookup where
 
 import Control.Arrow ((***), first)

src/TypeLevel/Rewrite/Internal/PrettyPrint.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE LambdaCase, RecordWildCards #-}
+{-# LANGUAGE CPP, LambdaCase, RecordWildCards #-}
 module TypeLevel.Rewrite.Internal.PrettyPrint where
 
 import Data.List (intercalate)

src/TypeLevel/Rewrite/Internal/TypeEq.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 module TypeLevel.Rewrite.Internal.TypeEq where
 
 import Data.Function

src/TypeLevel/Rewrite/Internal/TypeNode.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE ViewPatterns #-}
+{-# LANGUAGE CPP, ViewPatterns #-}
 module TypeLevel.Rewrite.Internal.TypeNode where
 
 -- GHC API

src/TypeLevel/Rewrite/Internal/TypeRule.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE LambdaCase, ViewPatterns #-}
+{-# LANGUAGE CPP, LambdaCase, ViewPatterns #-}
 {-# OPTIONS -Wno-name-shadowing #-}
 module TypeLevel.Rewrite.Internal.TypeRule where
 

src/TypeLevel/Rewrite/Internal/TypeTemplate.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE LambdaCase, ViewPatterns #-}
+{-# LANGUAGE CPP, LambdaCase, ViewPatterns #-}
 module TypeLevel.Rewrite.Internal.TypeTemplate where
 
 -- GHC API