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+Section S.
+
+  Variable A:Prop.
+  Variable W:A.
+  
+  Remark T: A -> A.
+    intro Z.
+    rename W into Z_.
+    rename Z into W.
+    rename Z_ into Z.
+    exact Z.
+  Qed.
+
+  (* bug :
+     Error:
+     Unbound reference: In environment
+     A : Prop
+     W : A
+     Z : A
+     The reference 2 is free
+     *)
+
+End S.