[R6RS] `call-with-current-continuation'

[dyb at cs.indiana.edu]

> I don't know what the continuation of `define' right-hand sides should
> be, i.e. whether the variable would get re-assigned or re-bound or
> whatever.

I thought we'd already decided on letrec* semantics for the library
bodies, which should nail down the meaning of continuations.  Our
read-only restriction for exported variables means that the implied
reassignment of any exported variable would fail, however.

Kent