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[plt-scheme] unitsig rename

From: Robert Bruce Findler (robby at cs.uchicago.edu)
Date: Sun Dec 1 20:16:45 EST 2002		 
You can use prefixing to get what you want, I think. How about
something like this:

(require (lib "unitsig.ss"))

(define-signature foo^ (foo%))
(unit/sig foo^
  (import [a : foo^])
  (define foo% (class a:foo%)))

Robby
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