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+(* Set Primitive Projections. *)
+Class foo {A} {a : A} := { bar := a; baz : bar = bar }.
+Arguments bar {_} _ {_}.
+Instance: forall A a, @foo A a.
+intros; constructor.
+abstract reflexivity.
+Defined.
+Goal @bar _ Set _ = (@bar _ (fun _ : Set => Set) _) nat.
+Proof.
+  Check (bar Set).
+  Check (bar (fun _ : Set => Set)).
+  Fail change (bar (fun _ : Set => Set)) with (bar Set). (* Error: Conversion test raised an anomaly *)
+
+Abort.
+
+
+Module A.
+Universes i j.
+Constraint i < j.
+Variable  foo : Type@{i}.
+Goal Type@{i}.
+  Fail let t := constr:(Type@{j}) in
+  change Type with t.
+Abort.
+
+Goal Type@{j}.
+  Fail let t := constr:(Type@{i}) in
+  change Type with t.
+  let t := constr:(Type@{i}) in
+  change t. exact foo.
+Defined.
+
+End A.