Fixes for ghc-7.8

Data/GraphQL/Parser.hs

@@ -10,7 +10,7 @@ import Data.Monoid (Monoid, mempty)
 #endif
 import Control.Applicative ((<|>), empty, many, optional)
 import Control.Monad (when)
-import Data.Char
+import Data.Char (isDigit, isSpace)
 import Data.Foldable (traverse_)
 
 import Data.Text (Text, append)

Data/GraphQL/Printer.hs

@@ -1,7 +1,11 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Data.GraphQL.Printer where
 
-import Prelude hiding (unwords)
+#if !MIN_VERSION_base(4,8,0)
+import Control.Applicative ((<$>))
+import Data.Monoid (Monoid, mconcat, mempty)
+#endif
 import Data.Monoid ((<>))
 
 import Data.Text (Text, cons, intercalate, pack, snoc)

tests/tasty.hs

@@ -1,6 +1,11 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE OverloadedStrings #-}
 module Main where
 
+#if !MIN_VERSION_base(4,8,0)
+import Control.Applicative ((<$>), (<*>))
+#endif
+
 import Data.Attoparsec.Text (parseOnly)
 import qualified Data.Text.IO as Text
 import Test.Tasty (defaultMain)