I've just published fixes for errata for SRFI 125.  The
changes were submitted by Shiro Kawai, and have been
approved by co-author John Cowan, so I have incorporated
them into the public document and added a note to the Status
section.  One of these errors is really a clarification, but
I'm interpreting it as an error because explaining the case
of popping from an empty table is an obvious and important
omission.

Here are Mr. Kawai's comments:

  There's no mention what will happen when the table is
  empty, which implies it is an error (or 'undefined
  behavior').  But it's a bit ambiguous from the current
  document and reference implementation---the latter is
  written in the way that it returns a single unspecified
  value when the table is empty.

  The suggested change clarify that such operation is an
  error, and update the reference implementation to detect
  the case.

  Since it does change the behavior of reference
  implementation, as well as the srfi document, it might not
  be qualified as post-finalization erratum.  If so, please
  reject.

Here's the diff:

<https://github.com/scheme-requests-for-implementation/srfi-125/compare/7f54a91a436094b8559694ced314043c4f1873c8...79cdf22c528fd1f93aba99251379efc80085f021>

Regards,

SRFI Editor