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diff --git a/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/Proc2.scl b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/Proc2.scl
new file mode 100644
index 000000000..bd8021b13
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/Proc2.scl
@@ -0,0 +1,29 @@
+import "Prelude"
+
+data RealWorld = RealWorld
+data IO a = IO (RealWorld -> (RealWorld, a))
+
+@inline
+unIO (IO m) = m 
+
+instance Functor IO where
+    @inline
+    fmap f x = x >>= (return . f)
+
+instance Monad IO where
+    @inline
+    return x = IO (\s -> (s, x))
+    
+    @inline
+    (IO m) >>= f = IO (\s -> do
+        (newS, v) = m s
+        unIO (f v) newS 
+    )
+
+@inline
+runIO :: IO a -> a
+runIO m = snd (unIO m RealWorld)
+
+main = runIO (return (13 :: Integer))
+--
+13