Matthias wrote:
> That is indeed a strange thing considering that set-cdr! is no longer a part
> of the language :-)
Yes indeed a very strange thing :-)
> In these areas, read-syntax takes over. Enter
>
> (read)
>
> at the prompt. Type
>
> #0=(1 . #0#)
>
> into the input box that appears.
>
I've done that and what displays is:
#0=(1 . #0#)
#0='(1 . #0#)
Again I'm not clear why this doesn't try to produce an endlessly recurring (1 .
(1 . ( 1 ....... list
Thanks,
Harry Spier
> Subject: Re: [racket] Reading graph structure
> From: matth...@ccs.neu.edu
> Date: Thu, 18 Aug 2011 09:25:06 -0400
> CC: users@racket-lang.org
> To: harrysp...@hotmail.com
>
>
> On Aug 18, 2011, at 9:09 AM, Harry Spier wrote:
>
> > When I put (#1=100 #1# #1#) in either the definitions or interactions
> > window I get
> >
> > . read: #..= expressions not allowed in read-syntax mode
>
>
> In these areas, read-syntax takes over. Enter
>
> (read)
>
> at the prompt. Type
>
> #0=(1 . #0#)
>
> into the input box that appears.
>
>
>
> > Also I'm not clear how #0=(1 . #0#) converts to
> > (let ([v (cons 1 #f)])
> > (set-cdr! v v) v)
>
>
> That is indeed a strange thing considering that set-cdr! is no longer a part
> of the language :-)
>
>
> -- Matthias
>
>
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