1 files changed, 34 insertions, 0 deletions
diff --git a/testsuite/tests/deriving/should_compile/drv020.hs b/testsuite/tests/deriving/should_compile/drv020.hs
new file mode 100644
index 0000000000..8794b745e5
--- /dev/null
+++ b/testsuite/tests/deriving/should_compile/drv020.hs
@@ -0,0 +1,34 @@
+{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies,
+             FlexibleInstances, GeneralizedNewtypeDeriving #-}
+
+-- Test deriving of a multi-parameter class for 
+-- one-argument newtype defined in the same module
+module ShouldSucceed where
+
+-- library stuff
+
+class Monad m => MonadState s m | m -> s where
+    get :: m s
+    put :: s -> m ()
+
+newtype State s a = State {
+                           runState :: (s -> (a, s))
+                          }
+
+instance Monad (State s) where
+	return a = State $ \s -> (a, s)
+	m >>= k  = State $ \s -> let
+		(a, s') = runState m s
+		in runState (k a) s'
+
+instance MonadState s (State s) where
+	get   = State $ \s -> (s, s)
+	put s = State $ \_ -> ((), s)
+
+-- test code
+
+newtype Foo a = MkFoo (State Int a)
+ deriving (Monad, MonadState Int)
+
+f :: Foo Int
+f = get