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About self-referential object

From: Xue Fuqiao
Subject: About self-referential object
Date: Sat, 5 Jan 2013 07:32:53 +0800

I have a question about self-referential object:

(setq foo '(nil))
=> (nil)
(setcar foo foo)
=> (#0)

It is an infinite recursion.  What does the `#0' mean here?  Can anybody help?  
Best regards, Xue Fuqiao.

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