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+Set Primitive Projections.
+Set Implicit Arguments.
+Set Universe Polymorphism.
+
+Record category :=
+ { ob : Type }.
+
+Goal forall C, ob C -> ob C.
+intros.
+generalize dependent (ob C).
+(* 1 subgoals, subgoal 1 (ID 7)
+
+ C : category
+ ============================
+ forall T : Type, T -> T
+(dependent evars:) *)
+intros T t.
+Undo 2.
+generalize dependent (@ob C).
+(* 1 subgoals, subgoal 1 (ID 6)
+
+ C : category
+ X : ob C
+ ============================
+ Type -> ob C
+(dependent evars:) *)
+intros T t.
+(* Toplevel input, characters 9-10:
+Error: No product even after head-reduction. *)