Re: About self-referential object

[Xue Fuqiao]

On Fri, 4 Jan 2013 16:55:56 -0800
"Drew Adams" <drew.adams@oracle.com> wrote:

> Let's assume first that it tries to print the infinite object without any
> abbreviation.  When it starts printing the value of `foo' it is at level 0 
> (top
> level).  When it tries to print the car of that cons, it needs to print the
> value of `foo' again, this time at printing level 1: `((foo))'.  When it tries
> to print that third `foo' it is at level 2, and so on.  Think of the printing
> "levels" here as recursive calls to a printing function.
> 
> To abbreviate, it prints just (#0), meaning a single cons cell with, as its 
> car,
> the same cons cell, i.e., the object that the printer started out to print.
Ah, I see, thanks.
-- 
Best regards, Xue Fuqiao.
http://www.emacswiki.org/emacs/XueFuqiao