Scheme Request for Implementation 40, "A Library of Streams," by Philip L. Bewig, has gone into "withdrawn" status.
The document and an archive of the discussion are available at <https://srfi.schemers.org/srfi-40/>. This SRFI was marked deprecated long ago, and was replaced by SRFI 41, so I'm marking it withdrawn now and adding a link to SRFI 40 from its home page. Regards, SRFI Editor