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Require Import Ltac2.Ltac2.
(* Preterms are not terms *)
Fail Notation "[ x ]" := $x.
Section Foo.
Notation "[ x ]" := ltac2:(Control.refine (fun _ => Constr.pretype x)).
Goal [ True ].
Proof.
constructor.
Qed.
End Foo.
Section Bar.
(* Have fun with context capture *)
Notation "[ x ]" := ltac2:(
let c () := Constr.pretype x in
refine constr:(forall n : nat, n = ltac2:(Notations.exact0 true c))
).
Goal forall n : nat, [ n ].
Proof.
reflexivity.
Qed.
(* This fails currently, which is arguably a bug *)
Fail Goal [ n ].
End Bar.
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