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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.
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