I've just published draft #6 of SRFI 160.  It was submitted by John Cowan, author of the SRFI, which was in turn based on SRFI 4 by Marc Feeley.

  <https://srfi.schemers.org/srfi-160/>

Here are John's comments on the draft:

  This includes the (srfi x4) library and the beginnings of a SRFI 160 implementation, as well as an update to srfi-160.html.

Here's the diff:

  <https://github.com/scheme-requests-for-implementation/srfi-160/compare/756d53a4cb284e5e2e1c49c0b105e85fb0c77d0a...65a27a8e2f8064f0bc709b68610832a44ea5bf84>

Regards,

SRFI Editor