[racket] impersonators/chaperones for lists

From: Shriram Krishnamurthi (sk at cs.brown.edu)
Date: Sat Oct 22 17:50:56 EDT 2011

Thanks to you and Sam -- I had wondered if the run-time system wasn't
partly driving this, and certainly chaperones on immutable data don't
make as much sense.  But I don't see them on mutable lists either....

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