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diff --git a/tests/org.simantics.scl.compiler.tests/src/org/simantics/scl/compiler/tests/scl/Functor.scl b/tests/org.simantics.scl.compiler.tests/src/org/simantics/scl/compiler/tests/scl/Functor.scl
new file mode 100644
index 000000000..6bbd35979
--- /dev/null
+++ b/tests/org.simantics.scl.compiler.tests/src/org/simantics/scl/compiler/tests/scl/Functor.scl
@@ -0,0 +1,23 @@
+import "JavaBuiltin" as Java
+
+class Functor f where
+    map :: (a -> b) -> f a -> f b
+    
+data Foo a = Foo a
+
+instance Functor Foo where
+    map f (Foo x) = Foo (f x)
+    
+instance Functor Maybe where
+    map f Nothing = Nothing
+    map f (Just x) = Just (f x)
+    
+data List a = Nil | Cons a (List a)
+
+instance Functor List where
+    map f Nil = Nil
+    map f (Cons h t) = Cons (f h) (map f t)
+    
+main = map (map (Java.iadd 1)) (Cons Nothing (Cons (Just (1 :: Integer)) Nil))
+--
+(Cons null (Cons 2 Nil))
\ No newline at end of file