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Set Universe Polymorphism.
Set Printing Universes.
Unset Strict Universe Declaration.
(* universe binders on inductive types and record projections *)
Inductive Empty@{u} : Type@{u} := .
Print Empty.
Set Primitive Projections.
Record PWrap@{u} (A:Type@{u}) := pwrap { punwrap : A }.
Print PWrap.
Print punwrap.
Unset Primitive Projections.
Record RWrap@{u} (A:Type@{u}) := rwrap { runwrap : A }.
Print RWrap.
Print runwrap.
(* universe binders also go on the constants for operational typeclasses. *)
Class Wrap@{u} (A:Type@{u}) := wrap : A.
Print Wrap.
Print wrap.
(* Instance in lemma mode used to ignore the binders. *)
Instance bar@{u} : Wrap@{u} Set. Proof. exact nat. Qed.
Print bar.
(* The universes in the binder come first, then the extra universes in
order of appearance. *)
Definition foo@{u +} := Type -> Type@{v} -> Type@{u}.
Print foo.
(* Binders even work with monomorphic definitions! *)
Monomorphic Definition mono@{u} := Type@{u}.
Print mono.
(* Using local binders for printing. *)
Print foo@{E M N}.
(* Underscores discard the name if there's one. *)
Print foo@{_ _ _}.
(* Also works for inductives and records. *)
Print Empty@{E}.
Print PWrap@{E}.
(* Also works for About. *)
About punwrap@{K}.
(* Instance length check. *)
Fail Print foo@{E}.
Fail Print mono@{E}.
(* Not everything can be printed with custom universe names. *)
Fail Print Coq.Init.Logic@{E}.
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