Avi Bryant wrote: 
> On Fri, 25 Oct 2002, Anthony Hannan wrote:
> 
> > Hello fellow Squeakers,
> >
> > I put up a new version of VI4 at 
> > http://minnow.cc.gatech.edu/squeak/VI4,
> > which allows Processes to be copied safely (send #copy to a 
> suspended
> > process).
> 
> But not a running one?  Ok, I can probably work around that.
> 
> > This is needed for continuations.  However, I haven't added a 
> > continuation protocol since I'm not sure what it should look like.
> 
> The protocol is pretty easy to describe - basically, what I 
> want is this method:
> 
> BlockContext>>callCC
>   ^ self value: [:v | ^ v]
> 
> Except that, of course, that naiive implementation will break 
> pretty quickly.  Eg, this code:
> 
> |continuation|
> 
> continuation := [:cc | cc] callCC.
> Transcript cr; show: 'hello'.
> continuation ifNotNil: [continuation value: nil].
> 
> ought to show:
> 
> hello
> hello
> 
> but instead it will show the first "hello" and then throw a 
> "cannot return" error.

Reading this code, I think that "cannot return" is the proper
behavior...are you saying that this needs to be changed such that this
code will output 2 'hello's?

- Stephen