module type Validate = Comparable_intf.Validatetype t 
val validate_lbound : min:t Comparable_intf.bound ->
       t Validate.checkval validate_ubound : max:t Comparable_intf.bound ->
       t Validate.checkval validate_bound : min:t Comparable_intf.bound ->
       max:t Comparable_intf.bound ->
       t Validate.check