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+Section foo.
+Polymorphic Universes A B.
+Fail Constraint A <= B.
+End foo.
+(* gives an anomaly Universe undefined *)
+
+Universes X Y.
+Section Foo.
+  Polymorphic Universes Z W.
+  Polymorphic Constraint W < Z.
+
+  Fail Definition bla := Type@{W}.
+  Polymorphic Definition bla := Type@{W}.
+  Section Bar.
+    Fail Constraint X <= Z.
+  End Bar.
+End Foo.
+
+Require Coq.Classes.RelationClasses.
+
+Class PreOrder (A : Type) (r : A -> A -> Type) : Type :=
+{ refl : forall x, r x x }.
+
+Section qux.
+  Polymorphic Universes A.
+  Section bar.
+    Fail Context {A : Type@{A}} {rA : A -> A -> Prop} {PO : PreOrder A rA}.
+  End bar.
+End qux.