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[racket] Void expression wanted

From: Hendrik Boom (hendrik at topoi.pooq.com)
Date: Sun Jan 4 22:11:30 EST 2015		 
I need a Typed Racket expression that, when executed, 
  (1) does nothing
  (2) returns a 'value' of type Void.

Much like (print 'foo) does, except I don't want anything printed.

-- hendrik
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