[racket] turning off shared printing in pconvert

From: Shriram Krishnamurthi (sk at cs.brown.edu)
Date: Mon Sep 5 21:47:04 EDT 2011

This program

#lang racket
(require mzlib/pconvert)
(parameterize ([show-sharing false])
   (shared ([-a- (list 0 -b-)]
            [-b- (list 1 -a-)])

produces this output in 5.1.3:

Language: racket; memory limit: 128 MB.
'(shared ((-0- `(0 (1 ,-0-)))) -0-)

How do I get pconvert to suppress sharing?

(The only option I see right now is to supply #t as the second
argument to print-convert, so that it suppresses sharing for DAGs and
only shows true cycles.)


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