Continuations are indeed interesting, but hard to implement unfortunately.
As a recap of my merging attempts; base call/cc worked, but I got stuck at
figuring how to get dynamic-wind and other extent-aware features working,
and unfortunately had to stash it

2022-12-08, kt, 01:43 Duncan Mak via Kawa <kawa@sourceware.org> rašė:

> There's a new SRFI effort on refining the continuation API:
>
> SRFI 226: Control Features (schemers.org)
> <https://srfi.schemers.org/srfi-226/srfi-226.html>
>
> It'd be interesting to look into implementing this SRFI for Kawa Scheme.
>
> On Mon, Aug 9, 2021 at 3:42 PM Per Bothner <per@bothner.com> wrote:
>
> > A suggestion: Polish and check in the code in the calcc branch.
> > Then change the interface so it is compatible that the tail-call API.
> > Specifically change the generated "fragments" so each looks like:
> >
> >    static Object stubNN(Procedure proc, CallContext ctx) throws
> Throwable)
> > { ... }
> >
> > and call each fragment using MethodHandle#invokeExact.
> >
> > Of course this is not trivial: The person(s) doing this have to
> understand
> > not just logic of callcc changes but also how applyToConsumerMethod and
> > CallContext etc work, before they can synthesize them.
> > --
> >         --Per Bothner
> > per@bothner.com   http://per.bothner.com/
> >
>
>
> --
> Duncan.
>