--- /dev/null
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE ExistentialQuantification #-}
+module GC where
+
+import Control.Monad
+
+import Foreign.Ptr
+import Foreign.Marshal.Alloc
+import Foreign.Storable
+import Foreign.C.Types
+import GHC.Int
+import Text.Printf
+
+class RefObject a where
+ mem :: a -> IntPtr
+ refs :: a -> [IntPtr]
+
+
+data RefObj = RefObj IntPtr [IntPtr] deriving Show
+
+instance RefObject RefObj where
+ mem (RefObj mem _ ) = mem
+ refs (RefObj _ refs) = refs
+
+data Succ = forall a. (RefObject a) => Succ (a -> [a])
+
+obj2 = do buffer <- mallocBytes 4
+ pokeByteOff buffer 0 (0::Int32)
+ return buffer
+
+obj3 = do buffer <- mallocBytes 4
+ pokeByteOff buffer 0 (0::Int32)
+ return buffer
+
+obj1 f g = do buffer <- mallocBytes 12
+ pokeByteOff buffer 0 (2::Int32)
+ pokeByteOff buffer 4 f
+ pokeByteOff buffer 8 g
+ return buffer
+
+ptrToRefObj ptr = do objCount <- peek ptr :: IO Int32
+ let objsBase = ptr `plusPtr` 4
+ objs <- mapM ((liftM ptrToIntPtr) . peekElemOff objsBase . fromIntegral) [0..objCount-1]
+ return $ RefObj (ptrToIntPtr ptr) objs
+
+test1 = do f <- obj2
+ g <- obj3
+ (print . ptrToIntPtr) f
+ (print . ptrToIntPtr) g
+ ptrToRefObj =<< obj1 f g
+
+traverse :: (RefObject a) => (IntPtr -> IO a) -> a -> [a] -> IO [a]
+traverse dereference x ws = do children <- mapM dereference (refs x)
+ undefined
+
+succMem :: Ptr a -> Succ
+succMem =undefined-- Succ (\_ -> obj1
+
+
+