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Require Import Ltac2.Ltac2.
Ltac2 Eval preterm:(notbound).
Ltac2 Notation "pretermize" t(preterm) := t.
Ltac2 Eval pretermize notbound.
(* this check is intern time *)
Fail Ltac2 Eval pretermize (fun x y : x => x).
Ltac2 Eval Constr.pretype preterm:(nat).
Fail Ltac2 Eval Constr.pretype preterm:(notbound).
Fail Ltac2 Eval Constr.pretype preterm:(nat = 0).
(* strict check *)
Fail Ltac2 baz () := preterm:(notbound).
(* variable capture *)
Ltac2 Eval
let x := preterm:(n = n) in
constr:(forall n:nat, ltac2:(Control.refine (fun () => Constr.pretype x))).
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