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diff --git a/helm/matita/tests/replace.ma b/helm/matita/tests/replace.ma
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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+set "baseuri" "cic:/matita/tests/replace/".
+include "legacy/coq.ma".
+alias id "nat" = "cic:/Coq/Init/Datatypes/nat.ind#xpointer(1/1)".
+alias num (instance 0) = "natural number".
+alias symbol "eq" (instance 0) = "Coq's leibnitz's equality".
+alias symbol "plus" (instance 0) = "Coq's natural plus".
+alias symbol "times" (instance 0) = "Coq's natural times".
+alias id "mult_n_O" = "cic:/Coq/Init/Peano/mult_n_O.con".
+alias id "plus_n_O" = "cic:/Coq/Init/Peano/plus_n_O.con".
+
+theorem t: \forall x:nat. x * (x + 0) = (0 + x) * (x + x * 0).
+ intro.
+ replace in \vdash (? ? (? ? %) (? % %)) with x.
+ reflexivity.
+ rewrite < (mult_n_O x).
+ rewrite < (plus_n_O x).
+ reflexivity.
+ reflexivity.
+ auto.
+qed.
+
+(* This test tests "replace in match t" where t contains some metavariables *)
+theorem t2: 2 + (3 * 4) = (5 + 5) + 2 * 2.
+ replace in match (5+?) with (6 + 4); [reflexivity | reflexivity].
+qed.