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diff --git a/test-suite/success/Mod_strengthen.v b/test-suite/success/Mod_strengthen.v
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+Module Type Sub.
+  Axiom Refl1 : (x:nat)(x=x).
+  Axiom Refl2 : (x:nat)(x=x).
+  Axiom Refl3 : (x:nat)(x=x).
+  Inductive T : Set := A : T.
+End Sub.
+
+Module Type Main.
+  Declare Module M:Sub.
+End Main.
+
+
+Module A <: Main.
+  Module M <: Sub.
+    Lemma Refl1 : (x:nat) x=x.
+      Intros;Reflexivity.
+    Qed.
+    Axiom Refl2 : (x:nat) x=x.
+    Lemma Refl3 : (x:nat) x=x.
+      Intros;Reflexivity.
+    Defined.
+    Inductive T : Set := A : T.
+  End M.
+End A.
+
+
+
+(* first test *)
+
+Module F[S:Sub].
+  Module M:=S.
+End F.
+
+Module B <: Main with Module M:=A.M := F A.M.
+
+
+
+(* second test *)
+
+Lemma r1 : (A.M.Refl1 == B.M.Refl1).
+Proof.
+  Reflexivity.
+Qed.
+
+Lemma r2 : (A.M.Refl2 == B.M.Refl2).
+Proof.
+  Reflexivity.
+Qed.
+
+Lemma r3 : (A.M.Refl3 == B.M.Refl3).
+Proof.
+  Reflexivity.
+Qed.
+
+Lemma t : (A.M.T == B.M.T).
+Proof.
+  Reflexivity.
+Qed.
+
+Lemma a : (A.M.A == B.M.A).
+Proof.
+  Reflexivity.
+Qed.
+