Michael Heerdegen <michael_heerdegen@web.de> writes:

> I tried with your package
>
> (defun fib (a b)
>       (stream-cons a (fib b (+ a b))))
>
> (seq-elt (fib 0 1) 10)
>
> but got the error
>
> unless: Symbol’s value as variable is void: #:forced

Have you tried turning on lexical binding?

Nico