Add StandalonDeriving language option to Pretty.

diff --git a/Pretty.hs b/Pretty.hs
index 3c007f9c8931116b3c7d3ecd43e689c86806d3d3..d23081e4f1ebcaec65ce960070d1579e8b477e35 100644 (file)
--- a/Pretty.hs
+++ b/Pretty.hs
@@ -1,5 +1,9 @@
+-- Needed for the Show deriving for Core types
+{-# LANGUAGE StandaloneDeriving #-}
+
 module Pretty (prettyShow) where
 
+
 import qualified Data.Map as Map
 import qualified Data.Foldable as Foldable
 import qualified List