fix imports for non-GHC

diff --git a/Data/Either.hs b/Data/Either.hs
index 956e6da..6af488f 100644 (file)
--- a/Data/Either.hs
+++ b/Data/Either.hs
@@ -27,8 +27,11 @@ module Data.Either (
 import GHC.Base
 import GHC.Show
 import GHC.Read
+#endif
+
 import Data.Typeable
 
+#ifdef __GLASGOW_HASKELL__
 {-
 -- just for testing
 import Test.QuickCheck