[racket] impersonators/chaperones for lists

From: Shriram Krishnamurthi (sk at cs.brown.edu)
Date: Sat Oct 22 16:10:27 EDT 2011

I'm missing why there are impersonators and chaperones for various
datatypes but not for lists.  There's surely a good reason why, but I
am having trouble reconstructing what it might be.  Anyone?


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