[racket] TR base-env typing classes/instances

From: Ray Racine (ray.racine at gmail.com)
Date: Wed Nov 7 16:02:18 EST 2012

Given racket/place/distributed then the typing should go into base-env.rkt
Assuming so, we face the situation that the place/distributed API uses
class instances.

e.g. spawn-node-supervise-place-at returns (values remote-node%

I know how to do it a la collects/types/mred but I couldn't spot an example
of class/instance typing in directly in base-env.rkt's DSL typing syntax.

Could an example be provided?

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