[racket] Callback on shutdown

From: Greg Hendershott (greghendershott at gmail.com)
Date: Mon May 5 14:08:50 EDT 2014

> I'm honestly not being funny, but do you mean 'imminent' program termination, or have I just leaned about yet another bit of programming-language-theory arcana? On this list, one can never be quite sure.

That's an excellent question. By "immanent" I meant to suggest that a
divine presence would manifest itself by intervening to spell check my
email.

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