|
|
On Tue, 1 Dec 2009 00:09:30 +0900 åååä <kawabata.taichi@xxxxxxxxx> wrote:
> Dear Emacs Developers,
> I've found an Emacs behavior that seems a bug concerning to `print-circle'
> and make-hash-table, so I would like to report it.
> By setting `print-circle' to `t', printing Lisp Object with recursive
> or repetitive
> list should be displayed as #N= and #N# syntax.
> However, it seems this is not true when printing lisp objects within
> hash tables
> (which become possible in Emacs 23.1.50.) Following is an example.
> Is it possible to display the repetitive lisp object within printed hash
> tables
> by #N= and #N# syntax, when `print-circle' is set to `t'?
> I notify this behavior as a bug, but it may not be so. I apologize in that
> case.
> (let ((print-circle t)
> (x (list 10 20))
> (y (make-hash-table)))
> (insert (format "%S\n" (list x x)))
> (puthash 1 x y)
> (puthash 2 x y)
> (insert (format "%S\n" y))
> (setcar x 3)
> (insert (format "%S\n" y)))
> Result:
(#1=(10 20) #1#)
#s(hash-table size 65 test eql rehash-size 1.5 rehash-threshold 0.8
data (1 (10 20) 2 (10 20)))
#s(hash-table size 65 test eql rehash-size 1.5 rehash-threshold 0.8
data (1 (3 20) 2 (3 20)))
> nil
I looked at the source in src/print.c. At the print_object() level the
behavior is correct for lists but fiendishly complicated so I couldn't
figure out the parallel structure for hashtables quickly. I'll put it
on my TODO list if no one else is interested.
Ted
|
|