Conjunction edit
#print_type 1--7 | 5--10;; -> 1--10
type IntOrChar = Int | Char;;
Disjunction edit
#print_type 1--7 & 5--10;; -> 5--7
Difference edit
#print_type Int \ 0;; -> *---1 | 1--*
Empty set edit
#print_type 1--3 & 5--6;; Empty
Universal type edit
"Any" is the set of all the values. "_" is the same thing, but is preferred in patterns context.
#print_type _;; -> Any