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diff --git a/packages/sundials/src/Test.hs b/packages/sundials/src/Test.hs
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+{-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE TemplateHaskell #-}
+{-# LANGUAGE MultiWayIf #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+import qualified Language.C.Inline as C
+import qualified Language.C.Inline.Unsafe as CU
+import           Data.Monoid ((<>))
+import           Foreign.C.Types
+import           Foreign.Ptr (Ptr)
+import           Foreign.Marshal.Array
+import qualified Data.Vector.Storable as V
+
+import           Data.Coerce (coerce)
+import           Data.Monoid ((<>))
+import qualified Data.Vector.Storable as V
+import qualified Data.Vector.Storable.Mutable as VM
+import           Foreign.C.Types
+import           Foreign.ForeignPtr (newForeignPtr_)
+import           Foreign.Ptr (Ptr)
+import           Foreign.Storable (Storable)
+import qualified Language.C.Inline as C
+import qualified Language.C.Inline.Unsafe as CU
+import           System.IO.Unsafe (unsafePerformIO)
+
+import qualified Language.Haskell.TH as TH
+import qualified Language.C.Types as CT
+import qualified Data.Map as Map
+import           Language.C.Inline.Context
+
+C.context (C.baseCtx <> C.vecCtx <> C.funCtx)
+
+-- C includes
+C.include "<stdio.h>"
+C.include "<math.h>"
+C.include "<arkode/arkode.h>"                 -- prototypes for ARKODE fcts., consts.
+C.include "<nvector/nvector_serial.h>"        -- serial N_Vector types, fcts., macros
+C.include "<sunmatrix/sunmatrix_dense.h>"     -- access to dense SUNMatrix           
+C.include "<sunlinsol/sunlinsol_dense.h>"     -- access to dense SUNLinearSolver     
+C.include "<arkode/arkode_direct.h>"          -- access to ARKDls interface          
+C.include "<sundials/sundials_types.h>"       -- definition of type realtype         
+C.include "<sundials/sundials_math.h>"
+C.include "helpers.h"
+
+-- | Solves a system of ODEs.  Every 'V.Vector' involved must be of the
+-- same size.
+-- {-# NOINLINE solveOdeC #-}
+-- solveOdeC
+--   :: (CDouble -> V.Vector CDouble -> V.Vector CDouble)
+--   -- ^ ODE to Solve
+--   -> CDouble
+--   -- ^ Start
+--   -> V.Vector CDouble
+--   -- ^ Solution at start point
+--   -> CDouble
+--   -- ^ End
+--   -> Either String (V.Vector CDouble)
+--   -- ^ Solution at end point, or error.
+-- solveOdeC fun x0 f0 xend = unsafePerformIO $ do
+--   let dim = V.length f0
+--   let dim_c = fromIntegral dim -- This is in CInt
+--   -- Convert the function to something of the right type to C.
+--   let funIO x y f _ptr = do
+--         -- Convert the pointer we get from C (y) to a vector, and then
+--         -- apply the user-supplied function.
+--         fImm <- fun x <$> vectorFromC dim y
+--         -- Fill in the provided pointer with the resulting vector.
+--         vectorToC fImm dim f
+--         -- Unsafe since the function will be called many times.
+--         [CU.exp| int{ GSL_SUCCESS } |]
+--   -- Create a mutable vector from the initial solution.  This will be
+--   -- passed to the ODE solving function provided by GSL, and will
+--   -- contain the final solution.
+--   fMut <- V.thaw f0
+--   res <- [C.block| int {
+--       gsl_odeiv2_system sys = {
+--         $fun:(int (* funIO) (double t, const double y[], double dydt[], void * params)),
+--         // The ODE to solve, converted to function pointer using the `fun`
+--         // anti-quoter
+--         NULL,                   // We don't provide a Jacobian
+--         $(int dim_c),           // The dimension
+--         NULL                    // We don't need the parameter pointer
+--       };
+--       // Create the driver, using some sensible values for the stepping
+--       // function and the tolerances
+--       gsl_odeiv2_driver *d = gsl_odeiv2_driver_alloc_y_new (
+--         &sys, gsl_odeiv2_step_rk8pd, 1e-6, 1e-6, 0.0);
+--       // Finally, apply the driver.
+--       int status = gsl_odeiv2_driver_apply(
+--         d, &$(double x0), $(double xend), $vec-ptr:(double *fMut));
+--       // Free the driver
+--       gsl_odeiv2_driver_free(d);
+--       return status;
+--     } |]
+--   -- Check the error code
+--   maxSteps <- [C.exp| int{ GSL_EMAXITER } |]
+--   smallStep <- [C.exp| int{ GSL_ENOPROG } |]
+--   good <- [C.exp| int{ GSL_SUCCESS } |]
+--   if | res == good -> Right <$> V.freeze fMut
+--      | res == maxSteps -> return $ Left "Too many steps"
+--      | res == smallStep -> return $ Left "Step size dropped below minimum allowed size"
+--      | otherwise -> return $ Left $ "Unknown error code " ++ show res
+
+-- -- Utils
+
+-- vectorFromC :: Storable a => Int -> Ptr a -> IO (V.Vector a)
+-- vectorFromC len ptr = do
+--   ptr' <- newForeignPtr_ ptr
+--   V.freeze $ VM.unsafeFromForeignPtr0 ptr' len
+
+-- vectorToC :: Storable a => V.Vector a -> Int -> Ptr a -> IO ()
+-- vectorToC vec len ptr = do
+--   ptr' <- newForeignPtr_ ptr
+--   V.copy (VM.unsafeFromForeignPtr0 ptr' len) vec
+
+
+-- /* Check function return value...
+--     opt == 0 means SUNDIALS function allocates memory so check if
+--              returned NULL pointer
+--     opt == 1 means SUNDIALS function returns a flag so check if
+--              flag >= 0
+--     opt == 2 means function allocates memory so check if returned
+--              NULL pointer  
+-- */
+-- static int check_flag(void *flagvalue, const char *funcname, int opt)
+-- {
+--   int *errflag;
+
+--   /* Check if SUNDIALS function returned NULL pointer - no memory allocated */
+--   if (opt == 0 && flagvalue == NULL) {
+--     fprintf(stderr, "\nSUNDIALS_ERROR: %s() failed - returned NULL pointer\n\n",
+--          funcname);
+--     return 1; }
+
+--   /* Check if flag < 0 */
+--   else if (opt == 1) {
+--     errflag = (int *) flagvalue;
+--     if (*errflag < 0) {
+--       fprintf(stderr, "\nSUNDIALS_ERROR: %s() failed with flag = %d\n\n",
+--            funcname, *errflag);
+--       return 1; }}
+
+--   /* Check if function returned NULL pointer - no memory allocated */
+--   else if (opt == 2 && flagvalue == NULL) {
+--     fprintf(stderr, "\nMEMORY_ERROR: %s() failed - returned NULL pointer\n\n",
+--          funcname);
+--     return 1; }
+
+--   return 0;
+-- }
+
+main = do
+  res <- [C.block| int { sunindextype NEQ = 1;        /* number of dependent vars. */
+                         N_Vector y = NULL;           /* empty vector for storing solution */
+                         void *arkode_mem = NULL;     /* empty ARKode memory structure */
+                         y = N_VNew_Serial(NEQ);      /* Create serial vector for solution */
+                         if (check_flag((void *)y, "N_VNew_Serial", 0)) return 1;
+
+                         N_VConst(0.0, y);            /* Specify initial condition */
+                         arkode_mem = ARKodeCreate(); /* Create the solver memory */
+                         if (check_flag((void *)arkode_mem, "ARKodeCreate", 0)) return 1;
+                         return 0;
+                       } |]
+  putStrLn $ show res