Gives a finite list of integers between the given bounds.
DESCRIPTION
The call m--n returns the list of consecutive numbers from m to n.
EXAMPLE
# 1--10;;
val it : int list = [1; 2; 3; 4; 5; 6; 7; 8; 9; 10]
# 5--5;;
val it : int list = [5]
# (-1)--1;;
val it : int list = [-1; 0; 1]
# 2--1;;
val it : int list = []