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diff --git a/tests/org.simantics.scl.compiler.tests/src/org/simantics/scl/compiler/tests/scl/PolymorphicRecursion.scl b/tests/org.simantics.scl.compiler.tests/src/org/simantics/scl/compiler/tests/scl/PolymorphicRecursion.scl
new file mode 100644
index 000000000..ed84193b7
--- /dev/null
+++ b/tests/org.simantics.scl.compiler.tests/src/org/simantics/scl/compiler/tests/scl/PolymorphicRecursion.scl
@@ -0,0 +1,16 @@
+// Idea here is to test the following property:
+// When a function is called recursively it has locally a monomorphic type.
+// Therefore the definition of cons does not work even if it works
+// with a proper type annotation.
+
+data Vec a = Nil | Zero (Vec (a,a)) | One a (Vec (a,a))
+
+// cons :: a -> Vec a -> Vec a
+cons x Nil        = One x Nil
+cons x (Zero ps)  = One x ps
+cons x (One y ps) = Zero (cons (x, y) ps)
+--
+11:21-11:42: Expected <Vec (a, a)> got <Vec a>.
+11:33-11:34: Type (a, a) is not a subtype of a.
+11:36-11:37: Type (a, a) is not a subtype of a.
+11:39-11:41: Expected <Vec a> got <Vec (a, a)>.
\ No newline at end of file