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From: Michael Heerdegen <michael_heerdegen@web.de>
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Subject: Re: seq.el and the complexity of Emacs Lisp.
Date: Fri, 10 Nov 2023 11:13:09 +0100
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João Távora <joaotavora@gmail.com> writes:

> Sure that's what seq.el does, but I see no definition of new sequence
> types in the core.  Whatever those "whatever sequence" types are,
> they have to be defined somewhere with implementations for a bunch of
> generic functions and I see none of that in the Emacs tree (again, from
> my quick greps).  Examples could be an implementation of lazy sequences
> for example.

We have lazy sequences in Gnu Elpa: stream.el.

Michael.