[racket] instantiating multiple sandboxes with gui's

It is not a difficult change to the code I saw to get this to always work.
FWIW.

On Saturday, April 5, 2014, Greg Hendershott <greghendershott at gmail.com>
wrote:

> > What if you do this:
> >
> >     (let l () (with-handlers ([void (l)]) (l)))
> >
> > This catches `exn:break` (and everything else) and calls `l`.
>
> Then I would type C-c C-k yes to kill the buffer. :)
>
> And then I would re-read the documentation for `with-handlers`, which
> recommends not to do that. :)
>
> Seriously:
>
> > Robby's answers in this thread are about exactly that -- DrRacket is
> > very robust against bad behavior by user programs. The "Programming
> > Languages as Operating Systems" paper is about exactly these
> > questions.
>
> Yes, and it's impressive, and I'm relieved that I don't need to go to
> those lengths.
>
> As Spencer pointed out, the spirit of this is more like xrepl. In
> fact, I could probably just use xrepl if it had a ,run command like
> this (as an alternative to ,enter). (If I can ever sort this out
> cleanly enough to do so, I'll submit a PR to add that.)
>
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