X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Futils%2FBag.lhs;h=b2be2c30db697b411231bb63a28b39dfe1741c65;hp=ebc44ac1479975276eb13f755ed0b1b4f974bb3e;hb=f278f0676579f67075033a4f9857715909c4b71e;hpb=ef6e8211dee59eb7fa80a242391b89b52bd57f80

diff --git a/compiler/utils/Bag.lhs b/compiler/utils/Bag.lhs
index ebc44ac..b2be2c3 100644
--- a/compiler/utils/Bag.lhs
+++ b/compiler/utils/Bag.lhs
@@ -18,9 +18,12 @@ module Bag (
         mapBagM, mapAndUnzipBagM
     ) where
 
+#include "Typeable.h"
+
 import Outputable
-import Util ( isSingleton )
+import Util
 
+import Data.Data
 import Data.List ( partition )
 
 infixr 3 `consBag`
@@ -188,4 +191,12 @@ bagToList b = foldrBag (:) [] b
 \begin{code}
 instance (Outputable a) => Outputable (Bag a) where
     ppr bag = braces (pprWithCommas ppr (bagToList bag))
+
+INSTANCE_TYPEABLE1(Bag,bagTc,"Bag")
+
+instance Data a => Data (Bag a) where
+  gfoldl k z b = z listToBag `k` bagToList b -- traverse abstract type abstractly
+  toConstr _   = abstractConstr $ "Bag("++show (typeOf (undefined::a))++")"
+  gunfold _ _  = error "gunfold"
+  dataTypeOf _ = mkNoRepType "Bag"
 \end{code}