--- /dev/null
+import "Prelude"
+import "Serialization" as Serialization
+
+rt :: Serialization.IO a => a -> a
+rt v = Serialization.readByteArray (Serialization.writeByteArray v)
+
+data FooBar a = Foo Integer | Bar a
+
+deriving instance (Show a) => Show (FooBar a)
+deriving instance (Serialization.IO a) => Serialization.IO (FooBar a)
+
+/*
+instance IO FooBar where
+ read s = match Serialization.read s :: Integer with
+ 0 -> Foo (Serialization.read s)
+ 1 -> Bar (Serialization.read s)
+ write s (Foo x) = do Serialization.write s (0 :: Integer) ; Serialization.write s x
+ write s (Bar x) = do Serialization.write s (1 :: Integer) ; Serialization.write s x
+*/
+main = show (rt (Foo 3 :: FooBar Double))
+--
+Foo 3
\ No newline at end of file