The Coq Proof Assistant

# Library Ltac2.Fresh

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.