Actually, this was not needed, just referenced in tests.  I've removed the export.

On Fri, Jun 19, 2020 at 10:24 PM Alex Shinn <xxxxxx@gmail.com> wrote:
This was needed for (srfi 166 pretty).  It should probably be in the spec, will add.

On Fri, Jun 19, 2020 at 5:48 PM Marc Nieper-Wißkirchen <xxxxxx@nieper-wisskirchen.de> wrote:
The sample implementation (Chibi's implementation) exports `show-column`.  This however is not in the spec.  Either it is missing there or the identifier shouldn't be exported and tested against.

Marc