[racket] Reading graph structure

Dear list members,

Firstly thank you, for clarifying uninterned symbols.

I've tried running the examples for reading graph structure in the reference manual 12.6.16 in DrRacket.

When I put (#1=100 #1# #1#) in either the definitions or interactions window  I get 

. read: #..= expressions not allowed in read-syntax mode

I've tried '(#1=100 #1# #1#) and it gives me the same error.

Same error with the second example:  #0=(1 . #0#)

Also I'm not clear how #0=(1 . #0#)  converts to 
(let ([v (cons 1 #f)])  
     (set-cdr! v v) v)

Thanks,
Harry Spier
 		 	   		  
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