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diff --git a/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/Serialization3.scl b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/Serialization3.scl
new file mode 100644
index 000000000..d883dfea7
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/Serialization3.scl
@@ -0,0 +1,22 @@
+import "Prelude"
+import "Serialization" as Serialization
+
+rt :: Serialization.IO a => a -> a
+rt v = Serialization.readByteArray (Serialization.writeByteArray v)
+
+data FooBar a = Foo Integer | Bar a
+
+deriving instance (Show a) => Show (FooBar a)
+deriving instance (Serialization.IO a) => Serialization.IO (FooBar a)
+
+/*
+instance IO FooBar where
+    read s = match Serialization.read s :: Integer with
+             0 -> Foo (Serialization.read s)
+             1 -> Bar (Serialization.read s)
+    write s (Foo x) = do Serialization.write s (0 :: Integer) ; Serialization.write s x
+    write s (Bar x) = do Serialization.write s (1 :: Integer) ; Serialization.write s x
+*/
+main = show (rt (Foo 3 :: FooBar Double))
+--
+Foo 3
\ No newline at end of file