cons
builtin-function
(cons item list)
(cons item delayed-expression)
Returns a new list with specified first and rest elements.
make-html > (defun fibo (a b)
(cons a (delay (fibo b (+ a b)))))
it: fibo
make-html > (take 15 (fibo 1 1))
it: (1 1 2 3 5 8 13 21 34 55 89 144 233 377 610)