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Shameless plug: I had created a similar library[0] for common lisp, though it didn't use conditions and restarts, also lacked a definitive yield construct. It still is profound how a major feature for other programming language is trivial to add to common lisp.

[0]: https://github.com/ykm/cl-iterators

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But you still require extensions to cut up the algorithm in discrete blocks, right?

Much thanks to macros, as usual; without that support, the approach wouldn't really be feasible for general purpose use.

Hmmm, frankly its just a CLOS object, with the defmethods controlling the iteration. I tried to model the object like Python iterators, however the API ended up a bit more like Haskell.

Aight, just to clarify; the step wise, stuttering experience that normally comes with extending iterators is what I'm trying to get away from here :)

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