CDuce/Types/Boolean connectives

Conjunction

#print_type 1--7 | 5--10;;
-> 1--10

type IntOrChar = Int | Char;;

Disjunction

#print_type 1--7 & 5--10;;
-> 5--7

Difference

#print_type Int \ 0;;
-> *---1 | 1--*

Empty set

#print_type 1--3 & 5--6;;
Empty

Universal type

"Any" is the set of all the values. "_" is the same thing, but is preferred in patterns context.

#print_type _;;
-> Any