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diff --git a/testsuite/tests/ghc-api/annotations/t10399.hs b/testsuite/tests/ghc-api/annotations/t10399.hs
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+{-# LANGUAGE RankNTypes #-}
+
+-- This program must be called with GHC's libdir as the single command line
+-- argument.
+module Main where
+
+-- import Data.Generics
+import Data.Data
+import Data.List
+import System.IO
+import GHC
+import BasicTypes
+import DynFlags
+import MonadUtils
+import Outputable
+import ApiAnnotation
+import Bag (filterBag,isEmptyBag)
+import System.Directory (removeFile)
+import System.Environment( getArgs )
+import qualified Data.Map as Map
+import qualified Data.Set as Set
+import Data.Dynamic ( fromDynamic,Dynamic )
+
+main::IO()
+main = do
+        [libdir] <- getArgs
+        testOneFile libdir "Test10399"
+
+testOneFile libdir fileName = do
+       ((anns,cs),p) <- runGhc (Just libdir) $ do
+                        dflags <- getSessionDynFlags
+                        setSessionDynFlags dflags
+                        let mn =mkModuleName fileName
+                        addTarget Target { targetId = TargetModule mn
+                                         , targetAllowObjCode = True
+                                         , targetContents = Nothing }
+                        load LoadAllTargets
+                        modSum <- getModSummary mn
+                        p <- parseModule modSum
+                        return (pm_annotations p,p)
+
+       let spans = Set.fromList $ getAllSrcSpans (pm_parsed_source p)
+
+           problems = filter (\(s,a) -> not (Set.member s spans))
+                             $ getAnnSrcSpans (anns,cs)
+
+           exploded = [((kw,ss),[anchor])
+                      | ((anchor,kw),sss) <- Map.toList anns,ss <- sss]
+
+           exploded' = Map.toList $ Map.fromListWith (++) exploded
+
+           problems' = filter (\(_,anchors)
+                                -> not (any (\a -> Set.member a spans) anchors))
+                              exploded'
+
+       putStrLn "---Problems---------------------"
+       putStrLn (intercalate "\n" [showAnns $ Map.fromList $ map snd problems])
+       putStrLn "---Problems'--------------------"
+       putStrLn (intercalate "\n" [pp $ Map.fromList $ map fst problems'])
+       putStrLn "--------------------------------"
+       putStrLn (intercalate "\n" [showAnns anns])
+
+    where
+      getAnnSrcSpans :: ApiAnns -> [(SrcSpan,(ApiAnnKey,[SrcSpan]))]
+      getAnnSrcSpans (anns,_) = map (\a@((ss,_),_) -> (ss,a)) $ Map.toList anns
+
+      getAllSrcSpans :: (Data t) => t -> [SrcSpan]
+      getAllSrcSpans ast = everything (++) ([] `mkQ` getSrcSpan) ast
+        where
+          getSrcSpan :: SrcSpan -> [SrcSpan]
+          getSrcSpan ss = [ss]
+
+
+showAnns anns = "[\n" ++ (intercalate "\n"
+   $ map (\((s,k),v)
+              -> ("(AK " ++ pp s ++ " " ++ show k ++" = " ++ pp v ++ ")\n"))
+   $ Map.toList anns)
+    ++ "]\n"
+
+pp a = showPpr unsafeGlobalDynFlags a
+
+
+-- ---------------------------------------------------------------------
+
+-- Copied from syb for the test
+
+
+-- | Generic queries of type \"r\",
+--   i.e., take any \"a\" and return an \"r\"
+--
+type GenericQ r = forall a. Data a => a -> r
+
+
+-- | Make a generic query;
+--   start from a type-specific case;
+--   return a constant otherwise
+--
+mkQ :: ( Typeable a
+       , Typeable b
+       )
+    => r
+    -> (b -> r)
+    -> a
+    -> r
+(r `mkQ` br) a = case cast a of
+                        Just b  -> br b
+                        Nothing -> r
+
+
+
+-- | Summarise all nodes in top-down, left-to-right order
+everything :: (r -> r -> r) -> GenericQ r -> GenericQ r
+
+-- Apply f to x to summarise top-level node;
+-- use gmapQ to recurse into immediate subterms;
+-- use ordinary foldl to reduce list of intermediate results
+
+everything k f x = foldl k (f x) (gmapQ (everything k f) x)