You can implement coroutines with continuations with two functions: def resume callcc do |cc| $current = self @caller = cc @r

You can implement coroutines with continuations with two functions: def resume callcc do |cc| $current = self @caller = cc @resumer.call end end def self.yield callcc do |cc| $current.resumer = cc $current.caller.call(cc) end end `resume` (on a coro) will store what coroutine we're entering (globally) and the caller-continuation (so we know where to go to after Coro.yield). It will then invoke the `resumer`-continuation. `Coro.yield` will store the `resumer`-continuation on the coro (so we know where to go to after `.resume`). You need something to kick it off though. The simplest way is probably to use `(@resumer || @code).call`.