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+(* Simplified example for bug #1325 *)
+
+(* Explanation: the proof engine see section variables as goal
+   variables; especially, it can change their types so that, at
+   type-checking, the section variables are not recognized
+   (Typeops.check_hyps_inclusion raises "types do no match").  It
+   worked before the introduction of polymorphic inductive types because
+   tactics were using Typing.type_of and not Typeops.typing; the former
+   was not checking hyps inclusion so that the discrepancy in the types
+   of section variables seen as goal variables was not a problem (at the
+   end, when the proof is completed, the section variable recovers its 
+   original type and all is correct for Typeops) *)
+
+Section A.
+Variable H:not True.
+Lemma f:nat->nat. destruct H. exact I. Defined.
+Goal f 0=f 1.
+red in H.
+(* next tactic was failing wrt bug #1325 because type-checking the goal 
+   detected a syntactically different type for the section variable H *)
+case 0. 
+Reset A.
+
+(* Variant with polymorphic inductive types for bug #1325 *)
+
+Section A.
+Variable H:not True.
+Inductive I (n:nat) : Type := C : H=H -> I n.
+Goal I 0.
+red in H.
+case 0.
+Reset A.