Comparable.Validatemodule T : sig ... endval validate_lbound : min:T.t Maybe_bound.t -> T.t Validate.checkval validate_ubound : max:T.t Maybe_bound.t -> T.t Validate.checkval validate_bound : 
  min:T.t Maybe_bound.t ->
  max:T.t Maybe_bound.t ->
  T.t Validate.check