1 files changed, 30 insertions, 0 deletions
diff --git a/testsuite/tests/rebindable/T303.hs b/testsuite/tests/rebindable/T303.hs
new file mode 100644
index 0000000000..418a695e8d
--- /dev/null
+++ b/testsuite/tests/rebindable/T303.hs
@@ -0,0 +1,30 @@
+{-# LANGUAGE RebindableSyntax #-}
+
+-- Trac #303
+
+module T where
+import qualified Prelude as P
+
+class IxMonad m where
+    return :: a -> m i i a
+    (>>=) :: m i j a -> (a -> m j k b) -> m i k b
+    (>>)  :: m i j a -> m j k b -> m i k b
+    m >> n = m >>= \_ -> n
+
+    fail :: P.String -> m i j a
+    fail s = P.error s
+
+data T a b c = T
+instance IxMonad T where
+    return _ = T
+    m >>= f  = T
+    fail _   = T
+
+testM :: T (a,b) b a
+testM = T
+
+test1 = testM >>= \x -> return x
+
+test2  = do
+   x <- testM
+   return x