All - the reference implementation for SRFI-110 is here:
  http://srfi.schemers.org/srfi-110/kernel.scm

The first draft of SRFI-110 has a URL that doesn't work on the SRFI website (due to differences in how the SRFI website is organized).  I've submitted a fix for that, but until then, that URL will work.

If you like watching sausages get made, you can track changes to SRFI-110 and its reference implementation via "git" by going to  http://sourceforge.net/p/readable/code  and looking at the "develop" branch.

 --- David A. Wheeler