John Cowan <xxxxxx@mercury.ccil.org> writes:

| There is only one implementation of SRFI 134 at present;
| if the finger-tree implementation gets written, that's
| fine, but if not it doesn't matter at this point.

I don't understand.  The finger tree implementation is in
the "ideque/" subdirectory:

  <https://github.com/scheme-requests-for-implementation/srfi-134/tree/master/ideque>