I've just published draft #2 of SRFI 172.  It was submitted by John Cowan, author of the SRFI.

  <https://srfi.schemers.org/srfi-172/>

Here are John's comments on the draft:

  Remove syntax expansion, add stern caveats in boldface

Here's the diff:

  <https://github.com/scheme-requests-for-implementation/srfi-172/compare/29b3ac17a9d0e685642ed1d5ccdd69a56ca025c3..b6af3db4fd280d7191d6de3a0f6b902d9b980021>

Regards,

SRFI Editor