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diff --git a/test-suite/success/Case20.v b/test-suite/success/Case20.v
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+(* Example taken from RelationAlgebra *)
+(* Was failing from r16205 up to now *)
+
+Require Import BinNums.
+
+Section A.
+
+Context (A:Type) {X: A} (tst:A->Type) (top:forall X, X).
+
+Inductive v: (positive -> A) -> Type :=
+| v_L: forall f', v f'
+| v_N: forall f', 
+  v (fun n => f' (xO n)) -> 
+  (positive -> tst (f' xH)) -> 
+  v (fun n => f' (xI n)) -> v f'.
+
+Fixpoint v_add f' (t: v f') n: (positive -> tst (f' n)) -> v f' :=
+  match t in (v o) return ((positive -> (tst (o n))) -> v o) with
+    | v_L f' => 
+        match n return ((positive ->  (tst (f' n))) -> v f') with
+        | xH => fun x => v_N _ (v_L _) x (v_L _)
+        | xO n => fun x => v_N _ 
+          (v_add (fun n => f' (xO n)) (v_L _) n x) (fun _ => top _) (v_L _)
+        | xI n => fun x => v_N _ 
+          (v_L _) (fun _ => top _) (v_add (fun n => f' (xI n)) (v_L _) n x)
+        end
+    | v_N f' l y r => 
+        match n with
+        | xH => fun x => v_N _ l x r
+        | xO n => fun x => v_N _ (v_add (fun n => f' (xO n)) l n x) y r
+        | xI n => fun x => v_N _ l y (v_add (fun n => f' (xI n)) r n x)
+        end
+    end.
+
+End A.