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[racket] illegal placeholder cycle

From: Doug Orleans (dougorleans at gmail.com)
Date: Tue Sep 6 16:21:57 EDT 2011		 
This error message is surprising:

> (shared ((c (append null c))) c)
make-reader-graph: illegal placeholder cycle in value: '(#<placeholder>)

Is it unreasonable to expect this to evaluate to null?

--Doug
Posted on the users mailing list.