(* Generate a fresh variable from a given prefix, e.g. "counter" -> "counter$1"  *)
val fresh_var : string -> string

(* Generate an Ast.loc tuple from Lexing data structures *)
val loc_from_lexpos : Lexing.position -> Lexing.position -> Ast.loc

(* Default transformation traversal for AST nodes *)
val transform_children : (Ast.node -> Ast.node) -> Ast.node -> Ast.node

(*val visit_children : (Ast.node -> unit) -> Ast.node -> unit*)

(* Extract location from node *)
val locof : Ast.node -> Ast.loc

(* Print file location to stderr *)
val prerr_loc : Ast.loc -> unit

(* Print file location to stderr *)
val prerr_loc_msg : Ast.loc -> string -> int -> unit