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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * Copyright INRIA, CNRS and contributors *)
(* <O___,, * (see version control and CREDITS file for authors & dates) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
Require Import Ltac2.Init.
Require Ltac2.Control.
Require Ltac2.List.
Module Free.
Ltac2 Type t.
(** Type of sets of free variables *)
Ltac2 @ external union : t -> t -> t := "ltac2" "fresh_free_union".
Ltac2 @ external of_ids : ident list -> t := "ltac2" "fresh_free_of_ids".
Ltac2 @ external of_constr : constr -> t := "ltac2" "fresh_free_of_constr".
Ltac2 of_goal () := of_ids (List.map (fun (id, _, _) => id) (Control.hyps ())).
End Free.
Ltac2 @ external fresh : Free.t -> ident -> ident := "ltac2" "fresh_fresh".
(** Generate a fresh identifier with the given base name which is not a
member of the provided set of free variables. *)
Ltac2 in_goal id := Fresh.fresh (Free.of_goal ()) id.
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