[racket] TR - Back patching avoidance in struct:

From: Ray Racine (ray.racine at gmail.com)
Date: Tue Aug 28 13:03:10 EDT 2012

> You could also do something like in
> http://www.ccs.neu.edu/racket/pubs/stop09-ft.pdf, to ensure that the
> only part of the code knows about the option value, and everyone else
> does not.

Apropos to the need at hand.  Thanks.
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