Example 3: User type for function reference
This example shows how to define a user type from a function type.
TYPE t_func_ref FUNCTION (p1 INT, p2 INT) RETURNS INT
MAIN
DEFINE fr t_func_ref
LET fr = FUNCTION add
DISPLAY fr(100,200)
END MAIN
FUNCTION add(p1 INT, p2 INT) RETURNS INT
RETURN (p1 + p2)
END FUNCTION