[racket] instantiating multiple sandboxes with gui's

From: Greg Hendershott (greghendershott at gmail.com)
Date: Sat Apr 5 14:54:05 EDT 2014

> thread cells are subject to GC and that's fine. The real issue is that I
> might write a program that does (effectively) this:
>  > (let l()(l))
> and then I'm stuck.

Good point, but that's not a problem. A break returns to read-eval-print-loop.

Example transcript:

> (let l () (l))
; user break
> (displayln "broken but alive")
broken but alive

(The double Control-C just being necessary as usual in an Emacs comint-buffer.)

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