Michael Heerdegen <michael_heerdegen@web.de> writes:

> That depends on whether you want/need to keep the matches so far.  If
> you don't need to save prior matches, you can just
>
>   (setq stream (stream-cdr stream))
>
> after generating an element, and memory usage will be O(1).  (Note to
> Nicolas: a `stream-pop' function would be nice in this context).

Indeed!  Could I by any chance get another pull request from you on
GitHub?

Nico