Hello,

It looks like the link to the reference implementation
(which is in the text body of the SRFI, not on the github
repository) is broken.

http://www.het.brown.edu/people/andre/macros/index.htm

It seems to be available through archive.org,
https://web.archive.org/web/2019*/http://www.het.brown.edu/people/andre/macros/index.htm
https://web.archive.org/web/20190211120127/http://www.het.brown.edu/people/andre/macros/index.htm

Perhaps it would be nice to change the link in the SRFI to the
archive.org page -- or bring the implementation in archive.org into the
github repository?

J.