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A module for variables that occur in terms.

The type of variables the can occur in terms

val compare : t -> t -> int

Comparison function on variables.

val mk : string -> Ty.t -> t

Create a new typed variable.

val ty : t -> Ty.t

Return the type of the variable.

val get_tag : t -> 'a Tag.t -> 'a option

Return the value bound to a tag (if any).

val set_tag : t -> 'a Tag.t -> 'a -> unit

Set the value bound to the tag.

val unset_tag : t -> _ Tag.t -> unit

Remove the binding to the given tag.