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+Set Universe Polymorphism.
+Set Printing Universes.
+Record Cat := { Obj :> Type }.
+Definition set_cat := {| Obj := Type |}.
+Goal Type@{i} = Type@{j}.
+Proof.
+  (* 1 subgoals
+, subgoal 1 (ID 3)
+
+  ============================
+   Type@{Top.368} = Type@{Top.370}
+(dependent evars:) *)
+  Fail change Type@{i} with (Obj set_cat@{i}). (* check that it fails *)
+  try change Type@{i} with (Obj set_cat@{i}). (* check that it's not an anomaly *)
+(* Anomaly: Uncaught exception Invalid_argument("Array.iter2", _).
+Please report. *)