bug#16890: current-thread need to be re-exported in srfi-18

[Mark H Weaver]

Nala Ginrut <nalagin...@gmail.com> writes:
> You don't have to import current-thread from srfi-18, it's already in
> top-level.

Not for R6RS code.  This is a genuine bug, and I'll push a fix shortly.

     Mark