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diff --git a/testsuite/tests/concurrent/should_run/conc015.hs b/testsuite/tests/concurrent/should_run/conc015.hs
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+++ b/testsuite/tests/concurrent/should_run/conc015.hs
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+import Control.Concurrent
+import Control.Exception
+
+-- test blocking & unblocking of async exceptions.
+
+-- the first exception "foo" should be caught by the "caught1" handler,
+-- since async exceptions are blocked outside this handler.
+
+-- the second exception "bar" should be caught by the outer "caught2" handler,
+-- (i.e. this tests that async exceptions are properly unblocked after
+-- being blocked).
+
+main = do
+  main_thread <- myThreadId
+  print =<< blocked -- False
+  m <- newEmptyMVar
+  m2 <- newEmptyMVar
+  forkIO (do takeMVar m
+	     throwTo main_thread (ErrorCall "foo")
+	     throwTo main_thread (ErrorCall "bar") 
+	     putMVar m2 ()
+	 )
+  ( do
+    block (do
+	putMVar m ()
+        print =<< blocked -- True
+	sum [1..1] `seq` -- give 'foo' a chance to be raised
+  	  (unblock $ myDelay 500000)
+		`Control.Exception.catch` 
+                    \e -> putStrLn ("caught1: " ++ show (e::SomeException))
+     )
+    threadDelay 10000
+    takeMVar m2
+   )
+    `Control.Exception.catch`
+       \e -> do print =<< blocked
+                putStrLn ("caught2: " ++ show (e::SomeException))
+
+-- compensate for the fact that threadDelay is non-interruptible
+-- on Windows with the threaded RTS in 6.6.
+myDelay usec = do
+  m <- newEmptyMVar
+  forkIO $ do threadDelay usec; putMVar m ()
+  takeMVar m