On 20 Sep 2012, at 09:40, José Pedro Magalhães wrote:
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"
Btw, where is this instance defined?
GHCROOT/compiler/utils/Bag.lhs, lines 266-270 (current git-repo HEAD and many
versions previously).
Ph.
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