sig
module VarSet :
sig
type elt = Ast.id
type t
val empty : t
val is_empty : t -> bool
val mem : elt -> t -> bool
val add : elt -> t -> t
val singleton : elt -> t
val remove : elt -> t -> t
val union : t -> t -> t
val inter : t -> t -> t
val diff : t -> t -> t
val compare : t -> t -> int
val equal : t -> t -> bool
val subset : t -> t -> bool
val iter : (elt -> unit) -> t -> unit
val fold : (elt -> 'a -> 'a) -> t -> 'a -> 'a
val for_all : (elt -> bool) -> t -> bool
val exists : (elt -> bool) -> t -> bool
val filter : (elt -> bool) -> t -> t
val partition : (elt -> bool) -> t -> t * t
val cardinal : t -> int
val elements : t -> elt list
val min_elt : t -> elt
val max_elt : t -> elt
val choose : t -> elt
val split : elt -> t -> t * bool * t
val find : elt -> t -> elt
end
val reset_type_vars : unit -> unit
val next_type_var : unit -> Ast.typ
val alpha_vary : Ast.typ -> Ast.typ
val type_of : Ast.aexpr -> Ast.typ
val type_of_pattern : Ast.apattern -> Ast.typ
val annotate : Ast.expr -> (Ast.id, Ast.typ) Hashtbl.t -> Ast.aexpr
val collect : Ast.aexpr list -> Ast.constr list -> Ast.constr list
val infer : Ast.expr -> (Ast.id, Ast.typ) Hashtbl.t -> Ast.typ
end